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© Soundcraft Electronics Ltd. 1990
All rights reserved
Issue 1 (first draft)
Part No. ZZ2686
Information in this manual is subject to change without
notice and does not represent a commitment on the part
of the vendor. Soundcraft Electronics Ltd. shall not be
liable for any loss or damage whatsoever arising from
the use of information or any error contained in this
manual.
No part of this manual may be reproduced, stored in a
retrieval system, or transmitted, in any form or by any
means, electronic, electrical, mechanical, optical,
chemical, including photocopying and recording, for any
purpose without the express written permission of
Soundcraft Electronics Ltd.
It is recommended that all maintenance and service on
the product should be carried out by Soundcraft
Electronics Ltd. or its authorised agents. Soundcraft
Electronics Ltd. cannot accept any liability whatsoever
for any loss or damage caused by service, maintenance
or repair by unauthorised personnel.
Soundcraft Electronics Ltd.
Unit 2
Borehamwood Ind Park
Rowley Lane
Borehamwood
Herts.
WD6 5PZ
England
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User Guide
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . 2
Basic Principles of Multitrack Recording . . . . . . . 4
Getting Started . . . . . . . . . . . . . . . . . . . 6
Connections and Connectors . . . . . . . . . 6
Fault Finding Guide . . . . . . . . . . . . . . 9
Getting to know your console . . . . . . . . . . 10
Facilities . . . . . . . . . . . . . . . . . . . 10
Input - Channel Path . . . . . . . . . . . . . 10
Input - Monitor Path . . . . . . . . . . . . . 15
Group Section . . . . . . . . . . . . . . . . 16
Master Section
. . . . . . . . . . . . . . . 18
Using your SPIRIT STUDIO Console . . . . . . . 21
Initial Set Up . . . . . . . . . . . . . . . . . . . 21
Applications . . . . . . . . . . . . . . . . . . . 24
Recording . . . . . . . . . . . . . . . . . . 24
Playback/Mix-Down . . . . . . . . . . . . . 25
Overdubbing . . . . . . . . . . . . . . . . 26
Live P.A. . . . . . . . . . . . . . . . . . . 27
Care of your mixer . . . . . . . . . . . . . . . . 28
Glossary . . . . . . . . . . . . . . . . . . . . . 28
Selectable Options . . . . . . . . . . . . . . . . 30
Specifications . . . . . . . . . . . . . . . . . . . 31
Front Panel Layout . . . . . . . . fold out rear cover
Block Diagram . . . . . . . . . . . inside rear cover
Page 1
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INTRODUCTION
Congratulations on your purchase of a SPIRIT STUDIO
mixer. Owning a Soundcraft console brings you the
expertise and support of one of the industry’s leading
manufacturers and the results of over 17 years experi-
ence supporting some of the biggest names in the
business.
Packed full of features for track-laying,
mixdown and overdubbing SPIRIT STUDIO provides
you with access to the full range of professional mul-
titrack techniques from an unusually compact mixer.
Designed by engineers who understand the individual
needs of musicians, SPIRIT STUDIO has been built to
the highest standards using quality Japanese compo-
nents and employing automated assembly techniques
beyond the reach of most manufacturers of compact
mixers.
A rugged steel chassis is combined with moulded side
trims to give protection and distinctive appearance.
Custom-moulded controls, designed for the best ‘feel’
and visual clarity complement the styling, resulting in a
truly professional product which is ideal for all types of
multitrack recording from 8-track all the way up to 24-
track.
An in-line console available in two frame sizes (16/8/2
and 24/8/2) there is no shortage of inputs on SPIRIT
STUDIO, since in mixdown mode the multitrack moni-
tor inputs double as extra line inputs.
The input channels are able to accept a wide range of
Microphone and Line level signals from separate input
sockets. Every channel features a separate Channel
and Tape Monitor section, with unique flexibility to
swap functions between the two paths. The 4-band EQ
is in two sections - normally the HL/LF section is be-
fore the insert point and the LOW MID and HI MID after
the insert point, thus allowing separate EQ of Send and
Return. If EQ to Monitor switch is pressed the HF/LF
EQ is switched into the Monitor path leaving the LOW
MID and HI MID section after the Insert point in the
Page 2
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Channel path. The Auxiliary Sends are similarly split to
give 1 Foldback and 2 Auxiliary sends in both the
Channel and Monitor paths, or all four Auxiliary sends
may be assigned to the Channel path.
The Monitor fader is normally a rotary control, but an
INPUT REVERSE switch swaps Channel and Monitor in-
puts, allowing the tape return signal to be brought
down the full facilities of the Channel path and mixed
on the long throw channel fader. The Channel PAN
control drives a matrix of routing switches to feed the
signal to 8 Groups in stereo pairs, plus the Stereo mix.
The Group masters are arranged as pairs, and the out-
puts are normalled to the respective Tape Sends on the
input channels in blocks of eight unless the Channel DI-
RECT switches are pressed. The Group output is also
available on a separate jack socket for use as an extra
send during mixdown. Groups may be routed as odd
and even pairs to the Stereo mix, or as combined
MONO feeds. Each group has a 16-segment LED bar-
graph meter.
Above the Group masters are 4 Stereo Effects Returns,
with balanced inputs, 2-band shelving EQ and feeds to
the two Foldback busses, the Stereo mix or summed
to the local Groups in stereo.
The Master section comprises the control room moni-
toring facilities, Oscillator with two fixed frequencies,
Talkback and Stereo mix and AFL/PFL metering.
A full description of all facilities in ‘Getting to know your
console’ can be found on page 10.
SPIRIT STUDIO is designed to be as user-friendly as
possible, but a few minutes spent reading through this
manual will help you become familiar with the product
away from the pressure of a recording session, and al-
low you to gain full benefit from the superb
performance offered by your new mixer.
Above all, remember that your SPIRIT mixer is de-
signed to extend your creativity. The more you explore
the controls and the effect they have on the sound out-
put, the more you will appreciate how you can
influence and enhance the final sound, both by careful
and creative balancing of channels and the use of
Page 3
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BASIC PRINCIPLES OF RECORDING
The Mixer
As one would expect, the main purpose of the mixer is
to combine sounds, but under precise and smooth
control. This is why long-throw faders are essential on
any professional product. The faders provide you with
total control of the final sound at your finger tips and
like an artist playing an instrument you should listen to
your fader movements, not look at your hands.
Your SPIRIT STUDIO mixer accepts a wide range of in-
put signals via a microphone input, for very low level
signals, or a line input, for higher level signals from, for
instance, tape machines, effects processors, etc.
The mixer is split into two sections. The Inputs receive,
match and process individual source signals, and dis-
tributes them at precise mix levels to a choice of
outputs. The Master and Group sections allow overall
level control of all outputs, and provides monitoring of
the audio signal at many points in the mixer, either on
headphones or meters.
The Equaliser controls are the most flexible and poten-
tially destructive feature of the mixer. They have a
similar effect on the frequency response of the input
channel as the tone controls on a hi-fi system, but with
much greater precision, and allow particular charac-
teristics of the input signal to be emphasised or
reduced. It is very important that you become familiar
with the effect each control has on the sound and this
is best achieved by spending time listening to the effect
of each control on a well-known track played through
the mixer.
The Auxiliary Sends provide a way of routing the input
signals to a number of secondary outputs, for artists
foldback, echo units or additional speaker outputs.
The Pan control adjusts the position of the input signal
within the stereo mix, and can be swept from full left,
through to full right. This allows particular artists to re-
tain their correct spatial position within the mix,
particularly important for stereo recording.
Pre-Fade-Listen(PFL) allows you to monitor the signal
at many points in the mixer. Pressing any PFL switch
places the signal at that particular point onto the control
room outputs (or headphones if plugged in) and the
Page 4
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right meter. This allows the engineer to check the qual-
ity of the signal or to pin-point problems. Using PFL
will not affect the signals on the Left and Right Mix out-
puts.
Each input channel and the Group and Mix outputs
have an Insert ‘A’ gauge jack socket, which is a break
point in the signal path. It allows the signal to be taken
out of the mixer, through an external piece of equip-
ment and then back into the mixer directly after its
original exit point. The Insert point is normally by-
passed by the ‘A’ gauge jack socket contacts, and is
only brought into operation when a plug is inserted.
Typical uses would include Effects Processors, Limiters
or additional Equalisers.
The terms PRE and POST are often used in the context
of Inserts, Equalisers and Auxiliary Sends, and describe
whether that facility is placed before (Pre) or after (Post)
another particular section. This is explained further in
the detailed description of facilities.
A mixer is often judged, amongst other factors, by the
amount of Headroom available. This is a measure of
the reserve available to cope with sudden peaks in the
input signal, without distortion caused by Clipping,
when the signal becomes so high that it would exceed
the power supply rail voltages and is as a result limited.
This commonly occurs where gain settings are incor-
Clipped
Signal
Noise
If the signal level is too high, clipping distortion
may occur.
Signal
Noise
If the signal level is too low it may be masked
by the noise.
Page 5
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rectly set or where sources are improperly matched to
the mixer input. If the source signal is too high, clipping
and distortion results. If the signal is too low it be-
comes masked by the background noise which is
present to some degree in all mixers. The diagram be-
low illustrates this point.
It is during recording that the greatest demands are
made on a mixer in terms of transparency and audio
quality. While a stereo recording will often be made di-
rect to the master tape machine, multitrack machines
provide greater flexibility by allowing the recording to
be done in three stages. The first stage is Tracking in
which individual voices or instruments, or groups of in-
struments are recorded as cleanly as possible on
selected tracks on the multitrack machine. The second
GETTING STARTED
CONNECTIONS AND
CONNECTORS
Although this may seem a simple subject, faulty con-
nectors and cabling are the source of most sound
system problems. Correctly-made cables of the proper
type, with the right connectors for the job will ensure
peak performance from your system with minimum
noise pick-up. The following section will help you to
connect SPIRIT STUDIO mixer correctly.
Two different types of audio connectors are used, 3-pin
1
XLR and ⁄4" three pole (‘A’ gauge) jacks. These are
2. Hot(+ve )
3. Cold (-ve )
1. Sc re e n
Ba la nc e d
Inp ut
Page 6
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3 POLE (ste re o) JACK
2 POLE (m ono) JACK
Se nd
Re turn
Sc re e n
Tip
Hot(+ve )
Co ld (-ve )
Sc re e n
Le ft Sig na l
Sig na l
Ring
Rig ht Sig na l
Ground
Sle e ve
Ground
Tip
Ring
Sle e ve
Inse rt Points
Line Inp ut
Aux Outp uts
FX Re turns
He a d p hone s
Unb a la nc e d
Inp ut
used in several configurations as shown in the dia-
grams below.
Balanced and
Unbalanced
All channel inputs are balanced, i.e. there are separate
+ve(hot) and -ve (cold) wires for each signal plus a
ground. The design of the differential input amplifiers is
such that interference picked up on these wires is can-
celled out. This is because, since both wires are in
close proximity, the same interference will be picked
up on each wire and balanced input amplifiers will only
amplify the difference between +ve(hot) and -ve(cold).
Any signal on both hot and cold (i.e. noise) will not be
amplified - this is known as common mode rejection
(CMR.). If using an unbalanced source into a balanced
input, it is a good idea to connect the source ground to
the negative input. Should the source device have no
connection to mains ground, then connect the shield at
both ends. If there is a connection to mains ground,
then the shield should only be connected to the source
device ground.
Note: many modern audio/musical instruments have
electronically balanced outputs which should not be
unbalanced by shorting one wire to ground. Always
use your inputs balanced where possible.
The mix, group and auxiliary outputs are ground com-
pensated and provide a very effective way of
optimising noise immunity, without the cost and com-
plexity of balanced outputs. These outputs employ
ground compensation techniques to cancel out the ef-
fects of variation in ground potential between the mixer
Page 7
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and other equipment which would otherwise show up
as hum. If the output is driving a device or amplifier
that has an unbalanced input, connect the -ve(cold) sig-
nal to the ground at the destination, not at the output of
your SPIRIT STUDIO console.
Polarity
You will probably be familiar with the concept of polar-
ity in electrical signals and this is of particular
importance to balanced audio signals. Just as a bal-
anced signal is highly effective at cancelling out
unwanted interference, so two microphones picking up
the same signal can cancel out, or cause serious deg-
radation of the signal if one of the cables has the +ve
and -ve wires reversed. This phase reversal can be a
real problem when microphones are close together and
you should therefore take care always to connect pins
correctly when wiring audio cables.
Source
BALANCED TO BALANCED
UNBALANCED TO BALANCED
UNBALANCED TO UNBALANCED
Input
Input
Input
+
-
+
-
GND
LINK
Source
+
+
-
GND
LINK
Source
+
+
GND
LINK
If ground link absent, or mains earth isolated from
source ground, then connect shield at both ends
Grounding and
Shielding
For optimum performance it is vital that all signals are
referenced to a solid, noise-free earthing point and that
all signal cables have their screens connected to
ground. To avoid earth ‘loops’, use balanced connec-
tions where possible and ensure that all cable screens
and other signal earths are connected to ground only at
their source and not at both ends.
Page 8
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Avoid running audio cables or placing audio equip-
ment, close to thyristor dimmer units or power cables.
Noise immunity is improved significantly by the use of
low impedance sources, such as good quality profes-
sional microphones or the outputs from most modern
audio equipment. Avoid cheaper high impedance mi-
crophones, which may suffer from interference over
long cable runs, even with well-made cables.
Fault Finding Guide
Repairing a sound mixing console requires specialist
skills, but basic Fault Finding is within the scope of any
user if a few basic rules are followed.
• Get to know the Block Diagram of your console (see
inside rear cover)
• Get to know what each component in the system is
supposed to do.
• Learn where to look for common trouble spots.
The Block Diagram is a representative sketch of all the
components of the console, showing how they con-
nect together and how the signal flows through the
system. Once you have become familiar with the vari-
ous component blocks you will find the Block Diagram
quite easy to follow and you will have gained a valu-
able understanding of the internal structure of the
console.
Each Component has a specific function and only by
getting to know what each part is supposed to do will
you be able to tell if there is a genuine fault! Many
‘faults’ are the result of incorrect connection or control
settings which may have been overlooked.
Basic Troubleshooting is a process of applying logical
thought to the signal path through the console and
tracking down the problem by elimination.
• Swap input connections to check that the source is
really present. Check both Mic and Line inputs.
• Eliminate sections of the channel by using the insert
point to re-route the signal to other inputs that are
known to be working.
Page 9
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GETTING TO KNOW YOUR CONSOLE
FACILITIES
Refer to the fold-out front panel diagram at the rear of this
manual, which shows the control functions on the SPIRIT
STUDIO. Each facility is described below, and is identified
by a reference number.
INPUT - CHANNEL PATH
1.
MICROPHONE INPUT
The Microphone input is via a standard female XLR-3
connector and is available when the LINE switch is re-
leased. It is designed to accept a wide range of
balanced or unbalanced low impedance input signals.
2.
+48V PHANTOM POWER
Each microphone input can provide the +48V neces-
sary for phantom-powered mics and this may be
turned on or off with the +48V switch.
NOTE: The microphone should always be plugged in
before switching the +48V on or off. Also you should
be aware that some microphones draw an unusually
large current which may overload the power supply, re-
sulting in distortion. Consult your microphone supplier
for guidance if necessary.
Transformer-coupled dynamic microphones may be
used without causing damage, even when the +48V
power is connected, but care must be taken when us-
ing unbalanced sources, because of the voltage
present on pins 2 and 3 of the XLR connector.
3.
INSERT
The INSERT is a break point in the input channel signal
path. It allows the signal to be taken out of the mixer,
through an external piece of equipment and then back
into the mixer to continue through to the final output.
1
The Insert is a 3-pole ⁄4" ‘A’ gauge Jack Socket, which
is normally by-passed. When a jack plug is inserted,
the signal path is broken at a point just before the MID-
EQ section. When the HF/LF EQ is switched into the
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channel path (see section 9) the insert is after that sec-
tion, allowing equalisation of both the insert send and
return. The signal from the channel appears on the TIP
of the plug and is returned on the RING. The insert
point allows limiters, compressors and other signal
processing units to be added as required to particular
input channels.
4.
LINE INPUT
1
The LINE Input is a ⁄4" 3 pole ‘A’gauge jack socket, to
accept balanced or unbalanced line level sources when
the LINE switch(5) is pressed. Unlike the low imped-
ance Microphone input, this stage presents a high
impedance(>10kΩ) to the input signal, enabling many
types of instruments to be plugged straight in without
D.I. boxes or external preamplifiers.
Line inputs will be useful as extra Effects Returns,
where additional post-effect equalisation is required.
5.
6.
LINE SELECT
The LINE switch selects Line input when pressed, and
Microphone input when released. When Line is se-
lected the Gain range is reduced by 20dB(see 6 below).
GAIN CONTROL
When the Microphone input is selected this control acts
as a SENSITIVITY control covering a 50dB range. Chan-
nel signal level increases as the control is turned
clockwise. When the Line input is selected it serves as
a GAIN control, with the scaling reduced by -20dB from
the printed scale. There is a line-up mark at the Line in-
put unity gain point.
Some audio equipment,
particularly that intended for domestic use, operates at
a nominal -10dBV level and an increased Gain setting
will be required.
7.
CHANNEL/MONITOR INPUT REVERSE
Normally the input to the Channel is the Mic/Line
source, while the input to the Monitor path is the tape
return. The CHANMNTR INPUT REV switch swaps over
these inputs, allowing the tape return signal to be
brought down the full facilities of the Channel path dur-
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ing mix-down using the long-throw channel fader. This
frees the Monitor path to serve as an extra input. Note
that the equalisation section and auxiliary sends are
both split to serve both signal paths.
8.
DIRECT
The DIRECT switch replaces the feed to the tape send
jack socket (which is normalled to the Group output)
with the channel post-fade signal. This allows direct re-
cording to a tape track from the channel, under the
control of the main channel fader. Note that the Tape
Send is factory-set to give a -10dBV output, even
though the Group output socket is +4dBu. To change
the Tape Send level to +4dBu see Selectable Options
on Page 32)
9.
HF/LF EQUALISER
The Equaliser(EQ) is configured as two separate sec-
Frequency Response Curves of the Equaliser
HF Section
dB
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
20
100
1k
10k
20k
Frequency/Hz
LF Section
dB
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
20
100
1k
10k
20k
Frequency/Hz
tions, to allow both the Channel and Monitor paths to
be provided with a useful range of equalisation simulta-
neously. The HF/LF EQ is usually in the Channel path,
unless the EQ to MNTR switch (10) is pressed. HF and
LF are shelving controls, providing a 15dB boost or
cut.
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10.
EQ TO MONITOR
As mentioned above, the HF/LF EQ section is usually
in the Channel path. Pressing EQ TO MNTR switches
these controls to the Monitor path, while leaving the
HIGH MID and LOW MID controls in the Channel path.
11.
HIGH AND LOW MID SWEEP EQ
The HMID and LMID EQ controls are usually in the
Channel path, and by careful choice of frequency limits
provide a comprehensive range of equalisation. The
two pairs of knobs are arranged as a CUT/BOOST con-
trol (lower knob) of +/-15dB and a SWEEP (frequency)
Frequency Response Curves of the Equaliser
HI MID Section
dB
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
20
100
1k
10k
20k
Frequency/Hz
LOW MID Section
dB
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
20
100
1k
10k
20k
Frequency/Hz
control which determines at which frequency the
boost/cut action will be centred. The HMID control
covers a range from 500Hz to 16kHz, and the LMID
control covers a range from 50Hz to 1.6kHz.
Note that when the CHANMNTR INPUT REV switch (7)
is pressed this section, along with the rest of the Chan-
nel path controls, are fed by the Tape Return signal.
12.
AUXILIARY SENDS
These controls route the input channel signal to any
one or more Auxiliary busses. These are separate
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from the main outputs and can therefore provide addi-
tional outputs for foldback or external processing units.
The six Auxiliary busses are arranged in two sections
of three, with each section comprising a pre-fade Fold-
back (FB) send and two post-fade, post-cut switch
auxiliary sends. Normally FB1 and AUX 1 & 2 are in
the Channel path, while FB2 and AUX 3 & 4 are in the
Monitor path.
13.
CHANNEL PAN
The Pan control determines the position of the Channel
signal within the stereo image. Rotation fully anticlock-
wise feeds the signal solely to the Left mix buss and
odd-numbered Groups, while rotation clockwise
sweeps the image to the Right and even-numbered
Groups.
14.
CHANNEL PFL/PEAK LED
When the PFL switch is pressed, the Pre-Fade signal is
fed to the Control Room and headphones outputs,
where it replaces the selected source. The PFL/AFL
LED on the master section illuminates to warn that the
monitor and the meters are now responding to the
PFL/AFL selection and the PFL LED on the input chan-
nel lights to identify the active channel. This is a useful
way of listening to any required input signal without in-
terrupting the main mix, so that adjustments can be
made or problems traced.
When the PFL switch is released the LED on the chan-
nel serves as a PEAK indicator, to warn when an
excessively high signal level is present in the channel.
The signal is sampled at two points in the channel,
PRE INSERT, (PRE HF/LF EQ if in the Channel path),
and POST EQ. The Peak LED will illuminate approxi-
mately 4dB before clipping and therefore give warning
of a possible overload even if the peaks are removed
by external equipment plugged into the Insert.
15.
CHANNEL ON
This switch routes the Channel signal to the Channel
PAN control and then to the routing matrix. It is posi-
tioned post-fader to ensure minimum system noise
when released, while leaving the pre- fade foldback
sends enabled.
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16.
17.
MIX & GROUPS 1-8
The input channel signal is routed to the main STEREO
mix (MIX) or to the GROUPS as stereo pairs (1-2, 3-4, 5-
6, 7-8) as selected by these switches.
CHANNEL FADER
This long-throw fader determines the proportion of the
channel in the mix and provides a clear visual indica-
tion of channel level. Normal operating position is at
the ‘0’ mark, providing 10dB of gain above that point if
required.
INPUT - MONITOR PATH
18.
TAPE SEND & RETURN
The TAPE SEND is normally fed from one of the 8
GROUP outputs. These are repeated across each 8
channels, e.g. Group 1 feeds Tape Sends 1,9,17 and
Group 2 feeds Tape Sends 2,10,18 etc. When the DI-
RECT switch (8) is pressed the Tape Send receives
only that channel output instead.
The electronically balanced TAPE RETURN is the nor-
mal input to the MONITOR path but is swapped to the
Channel path when CHANMNTR INPUT REV (7) is
pressed.
19.
TAPE TRIM
This centre-detented control provides -10dB to +20dB
of gain trim on the Tape Return input. Note that the
centre-detented position is the line-up point for +4dBu
type Tape Machines. For matching -10dBV machines
the control will need to be reset to about the ‘3 o’clock’
position.
20.
AUXILIARY SENDS (see 12 above)
The MONITOR path normally has a pre-fade Foldback
(FB2) send, and two post-fade Auxiliary sends (AUX
3,4) as described for the Channel path. AUX 3 & 4 may
be switched to the Channel path by the CHAN switch if
required.
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21.
22.
AUXILIARIES TO CHANNEL
FB2 and AUX 3 & 4 are normally in the Monitor path.
Pressing CHAN routes AUX 3 & 4 to the Channel path,
while FB2 remains unaltered.
MONITOR PAN
The Monitor PAN control determines the position of the
signal within the stereo image. Rotation fully anticlock-
wise feeds the signal solely to the Left mix buss, while
rotation clockwise sweeps the image to the Right.
23.
MONITOR FADER
This rotary control determines the overall level of the
Monitor signal path. Unity gain point is at approximately
7.5 on the scale.
24.
MONITOR PFL/PEAK LED
When the PFL switch is pressed, the Pre-Fade signal is
fed to the Control Room and headphones outputs,
where it replaces the selected source. The PFL/AFL
LED on the master section illuminates to warn that the
monitor and the meters are now responding to the
PFL/AFL selection and the PFL LED on the input chan-
nel lights to identify the active channel.
When the PFL switch is released the LED on the chan-
nel serves as a PEAK indicator, to warn when an
excessively high signal level is present in the Monitor
path. The signal is sampled at two points in the Moni-
tor path, PRE FADE (PRE HF/LF EQ if in the Monitor
path). The Peak LED will illuminate approximately 4dB
before clipping.
25.
MONITOR ON
The Monitor path is disabled unless the ON switch is
pressed - except FB2 which is always active. The
switch is post-fade to minimise system noise when
OFF.
GROUP SECTION
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26.
27.
GROUP FADERS
Long-throw master faders for each Group. Unity gain is
at the top of their travel.
GROUP OUTPUTS
The output from each Group is driven by a ground-
1
compensated amplifier and fed to standard ⁄4" 3 pole
’A’ gauge jack sockets.
28.
GROUP INSERTS
These allow external processing equipment to be ‘in-
1
serted’ into the Group signal path. The ⁄4" 3 pole ‘A’
gauge jack sockets are by-passed except when a plug
is inserted.
29.
PFL
When the PFL switch is pressed, the pre-fade Group
signal is fed to the Control Room Monitors and Head-
phones, where it replaces the selected source. The
PFL/AFL LED on the master section illuminates to
warn that the monitor and the meters are now respond-
ing to the PFL/AFL selection and the PFL LED on the
Group lights to identify the active Group.
30.
SUBGROUP MIX/MONO
The MIX switch routes the Groups as odd and even
pairs to the stereo Mix, or if the MNO switch is pressed
the groups are fed equally to both sides of the stereo
Mix.
31.
BARGRAPH METERS
A 16-segment, three colour bargraph meter provides
visual monitoring of output level for each Group. The
meter is factory set to a PEAK characteristic, but may
be changed internally to a VU characteristic. Please re-
fer to the Selectable Options section (Page 31) for
details.
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The bargraphs may be calibrated by trimmers fitted on
the edge of the PCBs and accessed via holes in the
panel above each meter. Adjustments may be made
using a small screwdriver, taking care not to damage
Frequency Response Curves of the Equaliser
HF Section
dB
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
20
100
1k
10k
20k
Frequency/Hz
LF Section
dB
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
20
100
1k
10k
20k
Frequency/Hz
the trimmers.
AUXILIARY MASTER
32.
Each of the Auxiliary Send busses is provided with a
rotary master level control and an AFL switch with indi-
cating LED which monitors the final output after the
fader.
33.
34.
AUXILIARY OUTPUT
The Auxiliary Send output is driven by a ground-com-
1
pensated amplifier to a standard ⁄4" 3 pole ‘A’ gauge
jack socket.
STEREO EFFECTS RETURN
Four Stereo Effects Returns are provided on pairs of 1⁄4"
3 pole‘A’ gauge jack sockets, to allow external equip-
ment to be returned to the mixer and routed to the
stereo Mix or Groups, without using up valuable input
channels. A mono signal may be plugged into either
socket of each pair to be fed equally to left and right
busses. The Effects Returns are electronically bal-
anced.
35.
TRIM
Each pair of Effects Returns has a centre-detented TRIM
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control giving adjustment of -10dB to +20dB.
EQUALISATION
36.
37.
38.
39.
Each pair of Effects Returns is provided with a 2-band
shelving EQ section giving +/- 15dB boost and cut.
FOLDBACK SENDS
Two pre-fade controls feed the Effects Return signals to
FB1 and FB2 busses in mono.
FX PAN
The PAN control determines the contribution each Ef-
fects Return signal makes to the stereo Mix.
FX FADER
A stereo rotary fader provides overall master level con-
trol for the Effects Return.
40.
41.
PFL
This operates in the same way as (29) above.
FX TO GROUP
The Effects Return Signal may be routed in stereo to
the pair of Groups immediately below it by pressing the
FX to GRP switch.
42.
FX TO MIX
The Effects Return signal may be routed to the stereo
Mix by pressing the FX To MIX switch.
MASTER SECTION
43.
MIX OUTPUTS
1
The LEFT and RIGHT outputs are standard ⁄4" 3 pole
‘A’ gauge jack sockets, driven by ground-compensated
output amplifiers.
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44.
MIX INSERTS
These are similar to the Input Channel Inserts and al-
low external processing equipment to be ‘inserted’ into
1
the output signal path. The ⁄4" 3 pole ‘A’ gauge jack
sockets are by-passed except when a plug is inserted.
45.
BARGRAPH METERS
Two 16-segment, three colour bargraph meters provide
visual monitoring of Mix L & R output levels. These are
factory set to a PEAK characteristic, but may be
changed internally to a VU characteristic. Please refer
to the Selectable Options section (Page 31) for details.
Normally the meters display Left and Right signals. If
any PFL or AFL switch is activated the left meter is
turned off and the right meter displays the selected PFL
or AFL signal.
The bargraphs may be calibrated by trimmers fitted on
the edge of the PCBs and accessed via holes in the
panel above each meter. Adjustments may be made
using a small screwdriver, taking care not to damage
the trimmers.
46.
47.
MIX MASTER FADERS
Master Faders for the Left and Right Mix outputs. Unity
gain is at the top of their travel.
OSCILLATOR
The dual frequency Oscillator is simultaneously turned
on and routed to the 8 Groups and the stereo Mix bus-
ses by the TAPE switch.
A second switch selects output frequency to either
1kHz (Up) or 10kHz (down). Level is determined by
the rotary control.
48.
FOLDBACK MASTER FADERS
Rotary master faders drive the FB1 and FB2 outputs
via ground- compensated amplifiers. Each Foldback
output has an associated AFL switch, sampling the sig-
nal after the fader.
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49.
LINK
The FB1 and FB2 outputs can be linked by pressing
the LINK switch, so that each output has the sum of
both signals. This gives greater flexibility in deriving
combined headphone feeds from the Channel and
Monitor paths.
50.
51.
FOLDBACK OUTPUTS
The FB1 and FB2 outputs are driven via ground-com-
1
pensated amplifiers to standard ⁄4" 3 pole ‘A’ gauge
jack sockets.
C/RM SOURCE TO FB1 & FB2
This rotary control feeds the selected control room
source (either Mix or 2-Track Replay) directly to the FB1
and FB2 busses. This provides the operator with a
very quick method of establishing a basic headphone
feed, which can then be refined by the use of the
FB1/FB2 sends on the input channels or groups.
52/53.
2 TRACK REPLAY
The source for the control room monitors is either the
stereo Mix signal or an external 2-Track tape machine
1
connected to a pair of standard ⁄4" 3 pole ‘A’ gauge
jack sockets (53). The selected signal will normally be
displayed on the bargraph meters (45), unless
PFL/AFL is active. This interface is factory set to suit -
10dBV equipment. If a level of +4dBu is required
please refer to the Selectable Options section on page
32.
54.
PFL/AFL TRIM & LED
When any PFL or AFL switch is pressed the selected
control room monitor source is replaced by the se-
lected PFL or AFL signal, and the LED illuminates to
show that AFL/PFL is active. The PFL/AFL signal is
displayed on the Right bargraph meter and the Left me-
ter is disabled. A rotary TRIM control provides level
adjustment to allow for differences in operating levels,
but AFL/PFL level will only be accurately displayed on
the Right meter with the Trim control in the centre (de-
tented) position.
55.
CONTROL/ROOM & PHONES LEVEL
A rotary fader controls level to the control room outputs
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USING YOUR SPIRIT STUDIO CONSOLE
Your choice of a SPIRIT STUDIO console has provided
you with a professional product capable of top quality
recording. But good results will only come through ex-
perience and time spent understanding the facilities on
your console. Recording sessions must focus on the
creativity of the artists, and not be disrupted by unfa-
miliarity and difficulty with the operation of the console.
It is important to recognise, and learn by experiment,
the importance of correct choice of inputs, microphone
placement and control settings.
The fold-out front panel drawing shows suitable initial
control positions to get you started.
INITIAL SET UP
The diagram on page 5 demonstrated how the match-
ing of input gain to the signal source was crucial to
avoid distortion at one extreme and excessive noise at
the other. Set up individual input channel as follows:
• Connect the Control Room outputs to a suitable am-
plifier and monitor loudspeakers.
• Connect the input required (microphone, keyboard
etc.)
Note: Phantom powered mics should be connected
before the +48V is switched on. Connect the Group
outputs to your tape machine inputs, and the tape
outputs to the tape returns on selected input chan-
nels
• Set Master and Group faders at ‘0’ and input faders
to the ‘0’ marking.
• Provide a typical level of source signal and press the
PFL button on the particular channel, monitoring the
level on the right-hand meter.
• Adjust the input gain until the meter is just reaching
the amber section (0dB) at a typical maximum
source level. This allows sufficient headroom to ac-
commodate peaks and establishes the maximum
level for normal operation. Note that the gain may
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change with alteration in EQ settings, and should be
rechecked later if necessary.
• Repeat this procedure on other channels as required.
Next, the Group faders must be adjusted to give an op-
timum level to the tape machine.
• Route an input channel to the first pair of groups us-
ing the routing switches beside the channel fader.
• Feed the input channel with a typical maximum sig-
nal level.
• Set up the Tape Machine so that its input levels are
displayed on the Track Meters.
• Adjust the Group fader to give a nominal Record
Level. Refer to your Tape Machine manual for guid-
ance if required.
Now you should set up a comfortable listening level or
the Control Room Loudspeakers.
• Feed a typical maximum signal level to an input
channel and press the corresponding PFL button.
Adjust C/RM & PHONES Level (55) to give a maxi-
mum comfortable listening level from the
loudspeakers. Release the PFL button once the ad-
justment is complete.
A stereo Monitor Mix can be set up using the Monitor
Level and Pan controls on those channels fed by the
tape machine outputs.
Recording Tracks
Tape tracks may be recorded in two basic ways, and
the following assumes that you have connected a suit-
able multitrack machine to the Tape Sends on the first
few Inputs. Remember to set the appropriate tracks on
the tape machine into RECORD on the required tracks,
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and to return them to PLAYBACK when recording is
complete. Individual input channels can be routed via
the DIRECT button to feed a selected track, replacing
the Group output which is normalled to the Tape Send.
This provides the shortest possible signal path from in-
put to tape.
Alternatively you may create GROUPS from a number
of inputs, e.g. for a drum mix, and feed a track from the
Group outputs which are normalled to the Tape Sends.
A stereo Group is set up as follows:
• Decide which Channel inputs are to be mixed to
form the Group, and press the appropriate Group
routing button on each of those Channels.
• Adjust the level of each channel within the Group
mix using the Channel fader, and the position of
each channel within the Group mix using the Chan-
nel PAN.
• Adjust the overall level of the Group output using the
Group fader.
Microphone Placement Careful microphone placement and the choice of a suit-
able type of microphone for the job is one of the
essentials of successful sound recording. The aim
should be to place the microphone as close as possi-
ble to the source, to cut out unwanted surrounding
sounds and maintain good separation and control of
the mix. Also a well-chosen and well-placed micro-
phone should not need any appreciable equalisation.
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APPLICATIONS
SPIRIT STUDIO is designed primarily as a multitrack re-
cording mixer, but may also be used for basic sound
reinforcement. The following diagrams show typical
configurations which will illustrate how the mixer is
connected to other equipment.
Example 1 - Recording In this basic recording set-up, various sources are con-
nected to the input channels, microphones to mic
inputs and keyboards, guitars and other instruments to
line inputs. A 16-track tape machine is fed from the
Tape Sends on channels 1-16, with playback via the
corresponding Tape Returns. The Groups 1-8 are nor-
malled to Tracks 1-8 and 9-16 in parallel, and individual
tracks can be recorded by setting the appropriate track
to record on the tape machine. FB1 and FB2 provide
artists foldback, and Aux 1 & 2 feed an effects proces-
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sor which is returned on Effects Return 1.
Example 2 - Playback/ In this example the tracks on the multitrack machine
Mix-Down
are to be mixed down to a stereo master on a 2-track
tape machine. Playback is via the Monitor path on the
channels, and pressing the CHANMNTR INPUT REV
switches allows mixing using the long-throw faders.
Channels are routed to MIX, and the 2-track machine is
fed from the Mix L & R outputs. The Monitor path on the
inputs is now fed by the mic/line sockets, effectively
doubling the number of inputs available and these can
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be used for extra sources, e.g. sequenced keyboards,
synths, drum machines etc. during mixdown.
Example 3 -
Overdubbing
This is a variation on the mix-down configuration. Over-
dubbing allows one or more tracks to be recorded as
other tracks are being played back in synchronisation.
A Foldback mix is created for the overdub artist using
FB2. All tape tracks are set in Playback (Sync) mode
except the tracks to be recorded, and the signal for
these can be derived from the channels (DIRECT) or by
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plugging the Tape input to the appropriate Group Out-
put.
Example 4 - Live Public Although primarily designed for recording, your
Address
SPIRIT STUDIO console can also serve very well as a
mixer for live sound reinforcement. In the basic con-
figuration shown, an assortment of sources are
connected to the input channels, microphone to mic in-
puts and a keyboard and guitar to line inputs. Note that
some guitars would not produce sufficient level for a di-
rect connection, and would require a D.I. box
connected via the microphone input. The main stereo
output is connected to the power amplifiers and speak-
ers, fed from the channels, via the subgroups if
necessary. An effects processor or graphic equaliser
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CARE OF YOUR MIXER
General Precautions
Avoid storing or using the mixer in conditions of exces-
sive heat or cold, or in positions where it is likely to be
subject to vibration, dust or moisture.
Keep the mixer clean using a soft dry brush, and an oc-
casional wipe with a damp cloth or ethyl alcohol. Do
not use any other solvents which may cause damage
to paint or plastic parts.
Avoid placing drinks or smoking materials on or near
the mixer. Sticky drinks and cigarette ash are frequent
causes of damage to faders and switches.
Regular care and inspection will be rewarded by a
Glossary
auxiliary send
an output from the console comprising a mix of signals from
channels and groups derived independently of the
main stereo/group mixes. Typically the feeds to the
mix are implemented on rotary level controls.
balance
the relative levels of the left and right channels of a
stereo signal.
Channel Path
the section of the input channel which accepts normal inpu
sources and feeds them to selected groups or stereo
mix under the control of the linear channel fader.
clipping
the onset of severe distortion in the signal path, usually
caused by the peak signal voltage being limited by the
circuit’s power supply voltage.
dB (decibel)
DI(direct injection)
a ratio of two voltages or signal levels, expressed by the
equation dB=20Log (V1/V2). Adding the suffix ’u’ de-
notes the ratio is relative to 0.775V RMS.
10
the practice of connecting an electric musical instrument
directly to the input of the mixing console, rather than
to an amplifier and loudspeaker which is covered by a
microphone feeding the console.
equaliser
a device that allows the boosting or cutting of selected
bands of frequencies in the signal path.
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feedback
foldback
the ‘howling’ sound caused by bringing a microphone
too close to a loudspeaker driven from its amplified sig-
nal.
a feed sent back to the artistes via loudspeakers or
headphones to enable them to monitor the sounds
they are producing.
frequency response
(sub) group
the variation in gain of a device with frequency.
an output into which a group of signals can be mixed.
headroom
the available signal range above the nominal level
before clipping occurs.
line level signals
Mix-down
at a nominal level of -10 to +6dBu, usually coming from a
low
impedance source.
the operational mode in which pre- recorded tracks on the
multitrack tape machine are replayed and mixed to cre-
ate a final Stereo master recording.
Monitor Path
the section of the input channel which is normally fed by th
tape machine outputs, and feeds to the stereo mix un-
der the control of a rotary fader to create a Monitor mix.
Overdubbing
pan (pot)
the operational mode in which one or more tracks can be
recorded or modified as other tracks are played back.
abbreviation of ’panorama’: controls levels sent to left
and right outputs.
peaking
an equaliser response curve affecting only a band of
frequencies i.e. based on a bandpass response.
PFL (pre-fade listen)
a function that allows the operator to monitor the pre-fade
signal in a channel independently of the main mix.
rolloff
a fall in gain at the extremes of the frequency response.
shelving
an equaliser response affecting all frequencies above or
below the break frequency i.e. a highpass or lowpass
derived response.
spill
acoustic interference from other sources.
talkback
the operator speaking to the artistes or to tape via the
auxiliary or group outputs.
transient
a momentary rise in the signal level.
trim control
a variable control which gives adjustment of signal level ov
limited and predetermined range usually for calibration
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Selectable Options
Selecting Average Response on Bargraphs
The Bargraph Meters on your SPIRIT STUDIO are capa-
ble of two modes of operation: PEAK and AVERAGE.
In Peak mode the meter responds rapidly to initial sig-
nal transients and decays slowly, making it easy to
detect overload. In Average mode the bargraph takes
on the characteristics of a VU meter with evenly fast at-
tack and decay times. All meters are factory-set to
PEAK characteristic, but may be changed to AVERAGE
response by moving a link from PeaK to AVErage posi-
tions on the appropriate PCB as shown below. To
select AVERAGE response, remove the PCB from the
console and carefully unsolder the link in the PK posi-
tion using the minimum of heat to avoid the possibility
of tracks lifting on the PCB. Replace the link in the AVE
position.
This operation should only be carried out by competent
technicians who possess the necessary soldering
skills.
Note: All odd Group and the LH Master meters are situ-
ODD GROUP METER PCB SC2972
GROUP PCB (EVEN) SC2971
IC5
AVE
IC5
PK
D2
R89
AVE
C42
C43
PK
C46
CN2
R89
C43
AVE
AVE
PK
C46
PK
LH MASTER METER PCB SC2974
MASTER PCB (RH) SC2973
IC7
AVE
PK
IC5
R153
CN3
C53
R89
C43
AVE
PK
C46
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Modification of Tape Sends & 2 Track Return Level
All input Tape Sends are factory set to suit -10dBV
equipment. If a level of +4dBu is required the output
level may be changed by removing resistors
R130/R131 from the Input PCB SC2970. This can be
done without removing the PCB by carefully cutting the
leads of the resistor above the board at the points
marked as shown below.
The Master 2-Track Return can similarly be changed to
suit +4dBu equipment by removing resistors
R14/R17/R54/R57 from the Master PCB SC2973 as
shown below. The PCB will need to be removed from
INPUT PCB SC2970
R24
C14
R29
R131
C16
R32
C17
R31
R131
C13
CUT
CUT
Remove
resistors
as shown
Edge view of PCB
MASTER PCB SC2973
R54
R57
R54
R57
R17
SW5
R14
R17
R14
LFR3
RFR3
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Specifications
Noise
Measured RMS, 22Hz to 22kHz Bandwidth
Line inputs selected at unity gain and terminated 150R.
Buss Noise:
Masters Down Masters Up, 24 Ch. Routed
Mix Left
Mix Right
Group
-98dBu
-98dBu
-95dBu
-95dBu
-95dBu
-98dBu
-98dBu
-86dBu
-86dBu
Nothing Routed
-85dBu
Aux (1)
Aux (4)
FB (1)
-85dBu
-84dBu
FB (2)
-84dBu
Mix Noise
24 Monitors Routed & ‘ON’
Mix Left
-80dBu
Mix Right
-80dBu
24 Monitors & Channels Routed
Mix Left
-80dBu
Mix Right
-80dBu
24 Monitors & Channels Routed & ‘ON’
Mix Left
-76dBu
-76dBu
Mix Right
E.I.N.
Microphone Input.
Maximum Gain,
Terminated 150R
-129dBu
C.M.R.R.
Measured at 1kHz
Microphone Input at Maximum Gain -90dB
Line Input at Unity Gain -55dB
Distortion
THD Measured 1kHz at +20dBu, 20Hz to 20kHz Band-
width
Line in to Mix out
Line in to Group out
Line in to Aux out
Line in to FB out
< 0.006%
< 0.006%
< 0.006%
< 0.006%
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Tape Send with +20dBu @ Group out < 0.006%
Crosstalk
Measured 1kHz sine wave
Routing Isolation (Mix L/R & Group) > 100dB
Max. Fader Attenuation
Max. Aux Send Attenuation
Channel Pan to Group Isolation
Channel ‘ON’ Switch Isolation
Monitor ‘ON’ Switch Isolation
FX Return to Mix
> 86dB Typical
> 89dB Typical
> 76dB
> 100dB
> 100dB
> 100dB
> 85dB
FX Return to Group
Frequency Response
Measured 20Hz to 20kHz Bandwidth, Relative to 1kHz
Mix Left/Right Outputs
Mono Output
+/- 0.5dB
+/- 1dB
Aux Outputs
+/- 0.5dB
Input & Output Impedances
Microphone Input
2kΩ
Line Input
10kΩ
75Ω
10kΩ
75Ω
Insert Sends
Insert Returns
Outputs
Input & Output Levels
Mic Input Maximum Level
Line Input Maximum Level
Mix Out Maximum Level
Mono Out Maximum Level
Aux Out Maximum Level
+10dBu
+30dBu
+21dBu
+21dBu
+21dBu
Metering
16 Segment LED Bargraph
Selectable ‘PEAK’ or ‘AVERAGE’ Reading
Accuracy Relative to ‘0dB’ +/- 1dB
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