Model FP33 User Guide
STEREO ENG MIXER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
©2005, Shure Incorporated
Printed in U.S.A.
27B8500 (Rev. 3)
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Precision, conductive plastic, sealed rotary input po-
tentiometers
Bi-color LED limiter and peak indicator for each output
Two linkable output peak limiters with adjustable
thresholds and release times
Slate microphone and slate tone with selectable func-
tions
Isolated two-way talk-back using Monitor In and modi-
fied Slate Mic/Tape Out jack
High tolerance 3.5 mm jacks for stereo Tape Out and
Monitor In
1 kHz tone oscillator
Mix bus jack and cable to link FP33 or FP32A mixers
Headphone monitor mode switch to select L, L+R
(Mono), R, or Stereo
Internal headphone level adjustments to balance post–
master audio levels and Monitor In levels at the head-
phone output
Selectable M/S decoding circuit for headphone monitor.
Mixer/Monitor In switch (locking and momentary)
Internal Monitor defeat switch for split-feed headphone
operation
Headphone volume control
1/4 in. and 3.5 mm jacks for stereo headphone outputs.
Customized operation via internal DIP switches, trim
pots, slide switches, and optional jumpers
Regulated voltage rails (r15 Vdc) provide exceptional
GENERAL
The Shure FP33 is a three-input, two-output portable ste-
reo mixer designed for professional electronic news gather-
ing (ENG), electronic field production (EFP), and on-loca-
tion film production. The FP33 mixer sets a new standard
for portable mixer performance and features. An exception-
ally low-noise design makes the FP33 ideal for use with dig-
ital transmission links or digital video and audio recording
media, including DAT. Lightweight, compact, and rugged,
the FP33 is designed to withstand the most demanding field
production conditions.
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All types of dynamic and condenser microphones may
be used with the FP33. The mixer provides 48 V phantom,
12 V phantom, and 12 V T (A-B) power for operating con-
denser microphones. It will operate for at least 8 hours on
two 9 V alkaline batteries. An external 12–30 Vdc power
source, such as a Shure PS20 or PS20E ac adapter, may
also be used.
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Features
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Exceptionally quiet design, suitable for use with DAT
and other digital formats
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Extended frequency response of 20 Hz–20 kHz
Dynamic range greater than 100 dB
Transformer balanced inputs and outputs for superior
rejection of RFI and electromagnetic hum
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Three selectable mic/line inputs
Two selectable mic/line outputs
Wide range input gain controls handle hot signal levels
without attenuators
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headroom
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48 V phantom, 12 V phantom, and 12 V T (A-B) micro-
phone power
Pop-up pan pots
Link switch gangs inputs 2 and 3 to control a stereo mi-
crophone
Switchable low-cut filters on each input
Bi-color LED signal presence and peak indicator for
each input
Professional VU meters with selectable timed or
toggled backlighting
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Bi-color power On/Off LED
Battery check switch and low battery warning LED
Non-polarized external power jack
External power operating range of 12 to 30 Vdc
Soft-touch, color coded control knobs with raised posi-
tion indicators
Metal XLR input and output connectors
Rugged, plated metal chassis
Operates for 8 hours on two 9 V alkaline batteries
Includes carrying case, shoulder strap, and mix bus cable
Designed and manufactured in U.S.A.
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Dual clutched Master gain control for simultaneous or
separate adjustment of output levels
1
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4
5
2
3
6
1
7
8
9
10
FP33
1 kHz
LINK
ON
SLATE
PEAK/LIM
BATT
L
R
L
R
L
R
L
VU
VU
PAN
PAN
PAN/BAL
MIC
-2 -10-7-5 -3
0
0
+3 +5
L+R
R
L
R
ST
L
-20
0
3
7
3
7
3
7
R
+3
+5
-10-7- -3
-20
5
0
LIM
0
10
0
10
0
10
+15
PEAK/LIM
1
2
3
MASTER dB
MON
14 15
16
18
13
17
19
12
11
Figure 1
FRONT PANEL CONTROLS AND INDICATORS (Figure 1)
1. Pan Control: Adjusts the amount of input signal sent
to the Left and Right outputs. Each Pan knob has a
center detent position. To avoid accidental movement
of the knob once it has been set, it may be pushed in
flush with the front panel.
ies, the Battery Check indicates the status of the exter-
nal operating voltage. When the mixer is using 9 V
batteries and an external dc supply, the Battery Check
indicates the status of the higher voltage source. A low
battery condition also is indicated when the Power On
LED changes to red and flashes at a slower rate. For
instructions on modifying the FP33 to allow only inter-
nal batteries or external power to be monitored at the
VU meter, see Internal Modifiable Functions.
Note: Pan Control 3 becomes a Left/Right Balance
Control when the LINK switch is activated (see the
LINK switch description for details).
2. Input Level Bi-Color LED: Glows green to indicate
the presence and relative level of an input signal. Also
glows red if the input signal reaches 6 dB below the
clipping (distortion) level. To program this LED so that
Note: The audio signal is not interrupted when the
Battery Check switch is activated.
7. Output Peak/Limiter Bi-Color LED: Glows red for
the individual Left and Right Channels when the out-
put signal reaches a factory preset peak level of +17
dBm. This peak level is user-adjustable from 0 dBm to
+17 dBm. (See the Peak LED Adjustment instruc-
tions.) If the Limiter is switched on, each LED glows
green to indicate Limiter operation. The LED will still
glow red if the preset peak level is reached before the
Limiter activation point is reached.
it functions only as a clipping level indicator, open the
battery compartment and move DIP Switch 10 to the
Off position.
3. 1 kHz Tone Oscillator Switch: Use the 1 kHz tone to
send a reference signal to any device connected to an
FP33 output. The 1 kHz tone mutes all inputs. The tone
level can be adjusted with the Master control.
4. Link Switch: In the LINK position (up), this switch
links the gain controls of Inputs 2 and 3 so they act as
a stereo pair. Input 2 is Left and Input 3 is Right. The
Input 3 Gain knob adjusts the level of the stereo pair.
The Input 3 Pan knob adjusts the Left/Right balance.
8. Slate Button: Activates a 400 Hz Slate Tone for one
second and also activates the Slate Microphone. The
Slate Microphone remains on while the button is de-
pressed. The Slate signal (Tone and Mic) appears at
the Left and Right outputs to identify the beginning of
a take. If desired, the Slate features can be modified
as follows: disable the Slate Tone; insert the Slate sig-
nal pre-Master control; or insert the Slate signal post-
Master control. See the Internal DIP Switches table for
instructions.
Note: Channel 2 Gain and Pan are disabled when the
LINK switch is activated. The low-cut filters for Input 2
and Input 3 are not linked.
5. Slate Microphone: The built-in condenser micro-
phone is activated when the Slate button is pressed.
See the Slate Button section for more information.
Note: To disable both the Slate microphone and the
Slate tone, set internal DIP Switches 5, 6, and 7 to Off.
Note: To disable both the Slate microphone and the
Slate tone, set internal DIP Switches 5, 6, and 7 to Off.
The Slate microphone may also be modified to act as
a talk-back microphone for communications. Refer to
the Internal Modifiable Functions section for details.
9. Power On/Off Switch: Turns the mixer on and off.
The mixer is on when this switch is in the “up” position.
10. Power On LED: Monitors the higher of the internal or
external voltage sources. Flashes green to indicate
power is on and voltage is greater than 12 Vdc.
Flashes red and slower to indicate low power (12 Vdc
or less).
6. Meter Lamp/Battery Check Switch: The Meter
Lamp function is activated by momentarily pushing
this switch upward. This function can be internally pre-
set for timed or toggled deactivation. See the table in
the Internal Switches and Controls section for details.
When this LED monitors the internal battery level, it
glows red typically when 30 minutes of battery power
remain. Refer to the Internal Battery Life section. For
instructions on modifying the FP33 to allow only in-
ternal batteries or external power to be monitored at
The Battery Check function is activated by momen-
tarily pushing this switch downward. The status of the
two 9 V batteries is indicated on the VU meter. When
the mixer is using an external dc supply and no batter-
2
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the VU meter, refer to the Internal Modifiable Func-
ENGLISH
DIP Switches and Limiter Threshold Adjustment for
instructions.
tions section.
11. Input Gain Control: Adjusts the gain level of each in-
put channel. Rotating the knob counterclockwise re-
duces the gain and raises the input clipping point. Use
a low control setting to handle “hotter” input signals
without distortion. With the FP33 input circuit, micro-
phones with a “hot” output may be used without an in-
line pad (attenuator). For best performance, adjust
each Input Gain control so the associated Input Level
LED illuminates red only on the loudest signal peaks.
16. Left/Right Channel Output Level Meters: 0 VU is
preset at a +4 dBm output level. This may be recali-
brated for each meter by an internal trim potentiometer.
See the VU Meter Adjustment paragraph for instruc-
tions.
Note: Mechanical meters are used because LCD me-
ters do not operate properly in cold weather; fluores-
cent meters drain batteries too quickly; and LED me-
ters are difficult to see in sunlight.
12. Input Low-Cut Filter Switch: Provides low-frequen-
cy roll-off to reduce wind noise and rumble. When us-
ing the filter, the frequency response is down 6 dB at
150 Hz. The roll-off slope is 6 dB per octave.
13. Master Gain—Right Channel Output: The outer
ring controls the Right channel output gain. The dual-
clutched control lets the Right and Left outputs be ad-
justed individually. Set it to “0 dB” for unity gain.
17. Monitor Input Switch: In the center position, this
switch sends the post-master audio to the headphone
output. In the left (locking ) or right (momentary) posi-
tion, it sends the audio signal from the Monitor In jack
to the headphone output.
18. Headphone Gain Control (Inner Knob): Adjusts the
headphone volume level.
WARNING: The headphone circuit is capable of
producing high volume levels that can damage the
user’s hearing. Make sure the headphone volume
setting is low (fully CCW) before putting on the
headphones.
14. Master Gain—Left Channel Output: The inner knob
controls the Left channel output gain. The dual-
clutched control lets the Right and Left outputs be ad-
justed individually. Set it to “0 dB” for unity gain.
Note: The 1 kHz tone oscillator level is set by the
Master Level controls. To calibrate other devices,
adjust the Master Level controls for a 0 VU re-
sponse.
19. Headphone Monitor Mode Switch (Outer Ring):
The user can monitor the FP33 output as: Stereo; Right
channel only; Mono (Left + Right); or Left channel only.
15. Output Peak Limiter Switch: Activates two fast-act-
ing, peak-responding limiters, one for each output
channel. Limiters help prevent overload distortion
from unexpected loud input signals. The limiter activa-
tion is indicated by the Output Peak/Limiter LEDs,
which illuminate green.
Note: This switch also affects the Monitor In signal.
When using a stereo MS microphone, such as the
Shure VP88, the user may wish to pass the mic signal
through the FP33 as separate Mid and Side signals,
yet hear decoded stereo in the headphones. Using the
Headphone MS Matrix, the user can monitor the FP33
output as: Discrete (Mid and Side); Side only, Stereo
(decoded MS), or Mono (Mid only). Refer to the Inter-
nal DIP Switch table for instructions on activating the
Headphone MS Matrix.
The limiters may be changed to: operate indepen-
dently; be linked as a stereo pair; activate at thresh-
olds from 0 dBm to +15 dBm; and have release time
constants of 0.1 second or 1 second. See the Internal
3
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1
IN
1
MIC
LINE
MIC
LINE
MIC
LINE
1
2
3
2
Figure 2
INPUT PANEL CONNECTORS AND CONTROLS (Figure 2)
1. Channel Inputs: The three female XLR inputs are
transformer balanced for superior rejection of hum,
RFI, and other interference. Each input can provide
48 V or 12 V phantom power (for condenser micro-
phones); 12 V T (A-B) power (for condenser micro-
phones); or no power (for dynamic microphones). See
the Internal Switches and Controls section.
2. Mic/Line Level Input Switch: Selects Microphone or
Line to match the incoming signal level. The Mic signal
level is typically 0.1–3 mV, and the Line signal level is
typically 0.1–3.0 V. In the Line level position, phantom
and T power are disconnected from the input.
2
1
MIX BUS
L
OUT
R
TAPE
OUT
MON
IN
MIC LINE MIC LINE
12-30 VDC IN
6
7
4
5
3
Figure 3
OUTPUT PANEL CONNECTORS AND CONTROLS (Figure 3)
1. Mix Bus Jack: Allows an FP33 to be connected to an
additional FP33 or FP32A mixer. A mix bus cable is
supplied with every FP33. The Mix Bus connection is
”two-way” and pre-Master. When two mixers are con-
nected via the Mix Bus, all six inputs appear at both
mixers’ outputs. The Master Gain control of either mix-
er can be adjusted without affecting the output of the
other. This provides the equivalent of a six-input stereo
mixer with two separate Master output sections.
In signal to the headphones. Program audio is not
heard in the headphones when this switch is on.
Note: A “split-feed” (FP33 audio in one ear and Monitor
In audio in the other) can be accomplished via internal
DIP Switches 4 and 5. Also, an internal modification will
allow attenuated FP33 audio to be heard in the head-
phones even when the Monitor In switch is activated.
Refer to the Internal Modifiable Functions section.
5. Tape Output Jack: A stereo 3.5 mm mini-phone jack
(auxiliary level) to feed a cassette recorder, DAT ma-
chine, or semi-pro video recorder. This output can be
modified to provide a mono (L+R) signal; provide an un-
balanced line level or mic level output; provide an iso-
lated output containing only the Slate mic and Slate
tone. Refer to the Internal Modifiable Functions section.
Note: The output level of both mixers will drop by 6 dB
when they are connected via the Mix Bus. Increase
the Master Gain to compensate for this.
2. Main Output: The two male XLR outputs are trans-
former balanced and may be switched to Mic or Line
Level. The Line Level output can be modified to a true
600ꢀ:. See the Internal Modifiable Functions section.
6. Mic/Line Level Output Switch: Selects Mic or Line
Level to match the input level of the device connected
to the FP33 output. The Mic signal level is typically
0.1–3 mV; the Line signal level is typically 0.1–3 V.
3. Headphones Outputs: A stereo 1/4 in. phone jack
and a stereo 3.5 mm mini-phone jack may be used
separately, simultaneously, or as auxiliary feeds to
other equipment.
7. 12–30 Vdc In Jack (External Power): This accepts
a non-polarized coaxial plug from a 12 to 30 Vdc ex-
ternal power supply. The external supply must have a
negative ground or a floating ground. A Shure PS20
or PS20E ac adapter, an automotive battery, or a re-
chargeable belt pack are all suitable power supplies.
4. Monitor In Jack: Designed to accept stereo line-level
signals. This 3.5 mm jack provides a “tape return” in-
put or a communications channel input. This signal
appears only in the FP33 headphone circuit. Activat-
ing the front panel Monitor In switch routes the Monitor
4
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ENGLISH
ENGLISH
INTERNAL SWITCHES AND CONTROLS (Cont.)
Note: Bold type indicates the Factory setting.
DIP SWITCH
POSITION
ON
FUNCTION
1
LIM LINK
Left and Right limiters act in tandem. If limiter thresholds are set differently, limiter action
is determined by the lower threshold setting.
OFF
Left and Right limiters act independently.
2
3
4
LIM RELEASE R
LIM RELEASE L
MON DEFEAT R
SHORT
Right limiter release time constant is 0.1 second. Use for speech.
LONG
Right limiter release time constant is 1 second. Use for music.
Left limiter release time constant is 0.1 second. Use for speech.
SHORT
LONG
Left limiter release time constant is 1 second. Use for music.
OFF
When front panel Monitor switch is activated, Monitor In signal is heard in Right head-
phone.
ON
When front panel Monitor switch is activated, Monitor In signal is not heard in Right head-
phone. Mixer audio remains in Right headphone.
5
MON DEFEAT L
OFF
When front panel Monitor switch is activated, Monitor In signal is heard in Left headphone.
When front panel Monitor switch is activated, Monitor In signal is not heard in Left head-
phone. Mixer audio remains in Left headphone.
ON
6
7
8
9
PRE-MAST SLATE
POST-MAST SLATE
SLATE TONE
ON
Inserts slate tone and slate microphone into circuit before the Master gain control (pre–
master). Slate level is controlled by Master.
OFF
ON
Removes slate tone/slate microphone from pre-master cIrcuit.
Inserts slate tone and slate microphone into FP33 circuit after the Master gain control
(post-master). Slate level not is controlled by Master.
OFF
ON
Removes slate tone and slate microphone from FP33 post-master circuit.
Slate tone (400 Hz) sounds for one second when front panel slate button is pushed. Slate
microphone also activates.
OFF
Slate tone does not sound when slate button is pushed. Slate microphone does activate.
METER LAMP
TOGGLED Lamp turns on/off when front panel lamp switch is toggled. Automatic timed turnoff of lamp
will not occur.
TIMED
Lamp turns on/off when front panel lamp switch is activated. If not manually switched off,
lamp will automatically turn off after 10 seconds to conserve battery life.
10
11
PRESENCE LEDs
ON
Input LEDs illuminate green to indicate signal presence and relative level.
OFF
Input LEDs do not illuminate green. Input LEDs will still illuminate red to indicate 6 dB be-
fore clipping.
12 V OR 48 V PHANTOM
12V
Provides 12 Vdc phantom power if selected for channel input.
48V
ON
Provides 48 Vdc phantom power if selected for channel input.
12 MS MATRIX FOR
HEADPHONES
Inserts MS decoding matrix into headphone circuit. User can monitor in stereo while allow-
ing separate Mic and Side signals to pass through the FP33.
OFF
Removes MS decoding matrix from headphone circuit.
POWERING THE FP33 MIXER
Mixer Operation
Battery
Current
(mA)
Battery
Life
(hours)*
The FP33 can be powered by a 12–30 Vdc external power
supply while preserving the life of the internal batteries.
(A) Idle, no signal
41
46
9
(B) As in (A) with +4 dBm continuous
output
7.8
External Power Supplied
11.4 Vdc to 30 Vdc
<11.4 Vdc
Internal Batteries
OFF (200 PA current at 18 V)
(C) As in (B) with three Shure SM81 mi-
crophones at 12 V phantom power
50
57
50
63
7.5
6.0
6.9
5.5
ON (Full power for the FP33 is sup-
plied by the higher voltage source)
(D) As in (B) with three Shure SM81 mi-
crophones at 48 V phantom power
BATTERY LIFE
(E) As in (B) with 63 : headphones
driven moderately loud (Sony MDRV6)
The FP33 is designed for low current consumption.
Under typical conditions (+4 dBm into 600 : in continuous
use and no phantom–powered microphones, meter illu-
mination, or headphones in use), and with two fresh 9 volt
alkaline batteries , the FP33 will operate for about eight
hours before the Power LED flashes. At this point, about 30
minutes of battery life remain. If more mixer features are
used, battery life will decrease accordingly (see table).
(F) As in (B) with meter illumination
continuously on
*Until Power LED begins to flash, and allowing 30 minutes to replace
batteries.
Note: Momentary use of headphones or meter illumina-
tion will not appreciably affect battery life.
6
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ENGLISH
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3. Slide the Limiter switch to the Off (down) position.
CONNECTING FP33 TRANSFORMER
BALANCED OUTPUTS TO TELEPHONE LINES
In the Line position, the Left and Right XLR outputs can be
used to drive dc-biased, “dialed up” telephone lines,
although there may be a slight increase in distortion. Use of
the limiter circuit is strongly advised, with the FP33 limiter
threshold set to +4 dBm. Modification of the FP33 output im-
pedance to 600ꢀ: is recommended for proper fidelity. (See
the Internal Modifiable Functions section for instructions.)
When connecting the FP33 to a telephone line in the United
States, use of an FCC-Registered interface adapter between
the mixer and the telephone line is mandatory. Outside the
U.S., consult the local telecommunications authority.
4. Adjust the Left Master gain control until the ac voltme-
ter reading is at the desired peak output level.
5. Open the battery compartment and turn the Peak LED
L trim pot completely clockwise.
6. Slowly adjust the trim pot counterclockwise until the
left Peak/Lim LED first illuminates red.
7. Repeat the above procedure for the right Peak/Lim
LED, using the Peak LED R trim pot.
Headphone Level Adjustments
To adjust the program level to match the audio signal
levels from a monitored source, proceed as follows:
1. Open the battery compartment and adjust the Head-
phone Level L and Headphone Level R ful counterclock-
wise.
USER ADJUSTMENTS
VU Meter Adjustment
To set the VU Meters to a value other than the factory
setting (0 VU = +4 dBm), proceed as follows:
2. Connect the device to be monitored via the 3.5 mm
Monitor In jack.
1. Connect a 600 : load across the Left XLR output set
for Line.
3. Move the Monitor Input Switch on the front panel to the
locking position (left).
2. Connect an ac voltmeter (such as the HP 400GL) in
parallel with the load.
4. Adjust the monitor input level, using the headphone
gain control on the front panel.
3. Slide the 1 kHz tone oscillator switch to the On (up)
position.
5. Move the Monitor Input switch on the front panel to the
post-master audio position (center).
6. Adjust the post-master audio to a comparable level,
using the Headphone Level L and Headphone Level
R potentiometers.
4. Adjust the 1 kHz Tone Oscillator level with the Left
(inside) Master gain control until the ac voltmeter read-
ing is at the level desired.
5. Open the battery compartment door and adjust the
Left VU Level trim pot with a screwdriver until the Left
VU Meter reads 0.
6. Repeat the above procedure for the Right Output and
the Right VU Meter.
INTERNAL MODIFIABLE FUNCTIONS
Selected internal functions of the FP33 can be modified
by the user to fit special applications. Procedures for per-
forming these modifications are listed below.
CAUTION: Due to the complex construction and exten-
sive use of surface-mount components, modifications to
the FP33 must be performed by a qualified service techni-
cian. Contact the Shure Service Department or your au-
thorized Shure Service Center for further information on
these modifications.
Limiter Threshold Adjustment
To adjust the Limiter threshold to a value other than the
factory setting (+15 dBm), proceed as follows:
1. Connect a 600 : load and an ac voltmeter across the
Left Line output as described in steps 1 and 2 of the
VU Meter Adjustment procedure.
2. Open the battery compartment and move DIP switch
1 to the Off position (refer to the chart on the inside of
the door).
3. Slide the 1 kHz tone oscillator switch to the On (up)
position.
4. Slide the Limiter switch to the Off (down) position.
5. Adjust the Left Master gain control until the ac voltme-
ter reading is 2 dB above the desired output level.
6. Slide the Limiter switch to the On (LIM) position.
7. Open the battery compartment and adjust the Lim Adj
L trim pot until the level drops to the desired reading.
Disassembly
1. Remove the six screws that secure the cover.
2. Slowly slide the cover backwards and unplug ribbon
cable P109.
3. Remove the three screws (marked with arrows) that
secure the upper PC board.
4. Remove the upper PC board.
5. Perform the appropriate modification procedure.
6. Reassemble the unit by doing Steps 1–4 in reverse.
Changing the Line Level Output Impedance to 600 :
1. Locate R674 and R668 on the bottom PC board and
remove them.
2. Locate X503 and X505 on the bottom PC board and sol-
der a 470 :ꢁ 1/2W resistor through the holes at X503.
3. Solder a 470 :ꢁ 1/2W resistor through the holes at
X505.
8. Repeat the above procedure for the Right output, us-
ing the Lim Adj R trim pot.
Peak LED Adjustment
To adjust the Peak LED threshold to a value other than
the factory setting (+17 dBm), proceed as follows:
Changing the Tape Out Jack from Stereo (tip = L;
ring = R) to Mono (tip = L+R; ring = L+R)
1. Locate X504 on the top side of the lower PC board, by
the Tape Out jack.
1. Connect a 600 : load and an ac voltmeter across the
Left Line output as described in steps 1 and 2 of the
VU Meter Adjustment procedure.
2. Slide the 1 kHz tone oscillator switch to the On (up)
position.
2. Solder a jumper through the holes at X504.
8
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C in PF= (85/frequency) - .33
Example for 200 Hz corner frequency
85/200 = .43
Decreasing Tape Out Level to Mic Level
1. Locate R1112 and X511 (the top side of the bottom PC
board, by the L Out XLR connector).
.43-.33 = .1 PF
For a 200 Hz corner frequency, use a 0.1 PF capacitor.
2. Locate R1114 and X510 (the bottom side of the bottom
PC board, by the Tape Out jack).
3. Remove R1112 and R1114.
Note: The capacitor must be a ceramic or film type,
non-polarized, with a 16 V or higher rating.
4. Solder a jumper through the holes at X511.
5. Solder a jumper through the holes at X510.
2. For Input 1, locate X811 and X812. Solder the new ca-
pacitor between these points.
3. For Input 2, locate X813 and X814. Solder the new ca-
pacitor between these points. Also locate X815 and X816
on the bottom board, just behind the input gain controls.
Solder another new capacitor between these points.
4. For Input 3, locate X809 and X810 on the bottom
board, just behind the input gain controls. Solder the
new capacitor between these points.
Increasing the Tape Out Level by +10 dB
1. Locate R669 and R672 on the bottom PC board.
2. Remove these two resistors.
3. The Tape Out impedance is now 6 k:.
Changing the Slate Mic and the Slate Tone to Feed
Only the Tape Out Jack
5. To raise the corner frequency higher than the factory
preset of 260 Hz, contact the Shure Technical Applica-
tion Group at (847) 866-2525.
This modification provides an isolated, unbalanced out-
put for talk-back. For example, the user could talk to a
boom operator though the Slate mic. The Monitor In func-
tion could be used to hear the boom operator’s response.
Slowing Down Output Level Meters to Approximate
“True VU” Ballistics
1. Locate and remove R663, R669, R670, R672, R673,
and R765 from the bottom PC board.
1. Locate empty pads C302 and C303 on the top PC
board, behind the power switch.
2. Solder a 150ꢀPF x 6.3 V electrolytic capacitor in C302.
The + lead must face the meters.
3. Solder a 150ꢀPF x 6.3 V electrolytic capacitor in C303.
The + lead must face the meters.
4. To slow the meter response even more, further in-
2. Solder a jumper through the holes at X504 (behind the
Tape Out jack).
3. Solder one end of an insulated jumper into the hole at
X600 (about 40 mm [1.5 in.] behind the Tape Out jack).
4. Solder the other end of this jumper to the jumper at X504.
5. Set the Pre-Mast Slate DIP switch (#6) to On.
6. Set the Post-Mast Slate DIP switch (#7) to Off.
crease the PF value of C302 and C303.
7. The nominal Tape Out level is now –10 dBV (aux level).
The Modified Tape Out contains only the Slate tone and
Slate microphone. The Slate tone and Slate micro-
phone are removed from the main outputs.
Changing Battery Indicators to Monitor Internal or
External Power
The following modifications allow only the internal bat-
teries or the external power supply to be monitored at the
VU meter.
Providing Mixer Audio in the Headphones when the
Monitor Switch is Activated
Modification:
Procedure:
To monitor external To monitor internal
This modification allows the user to listen to the monitor
input signal and attenuated mixer audio simultaneously.
power only
battery power only
Remove R492
Remove R490
1. Locate X501 and X502 on the bottom PC board.
2. Determine the amount of attenuation desired for mixer
audio, using the following table.
The following modifications allow the Red/Green Power
LED to indicate low voltage status for only the internal bat-
tery or the external power supply.
Mixer Audio Attenuation
Required Resistor
Impedance
Modification:
To indicate low ex- To indicate low in-
ternal power only
ternal battery pow-
er only
Less than 10 dB
10 dB
Less than 150 k:
150 k:
Procedure:
Remove R493
Remove R491
15 dB
300 k:
Other Available Modifications
Greater than 15 dB
Greater than 300 k:
x
x
x
x
x
x
x
Changing VU Meter Scale for Battery Voltage Indication
Converting FP32 to FP32A or FP33 Mix Bus
Increasing Output Level of Slate Mic
3. Solder a 1/8W or 1/4W resistor through the holes at
X501.
4. Solder a 1/8W or 1/4W resistor through the holes at
X502.
Power LED Red Flashing Point
5. Activate the Monitor In switch. FP33 audio will be atte-
nuated by the predetermined level.
Reduction of Headphone Circuit Output Impedance
Single Output Level Control
Decreasing the Low-Cut Filter Corner Frequency
(3 dB down point)
XLR Connector Change from Female to Male
For further information about these modifications, call
1. Calculate a new capacitor value for the lower low-cut
corner frequency. Use the following formula:
the Shure Technical Application Group at (847) 866–2525.
9
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Overload and Shorting
SPECIFICATIONS
Shorted outputs, even for prolonged periods, cause no
damage. Microphone inputs of up to 3 Vrms cause no
damage. The Line and monitor inputs can withstand sig-
nals of up to 30 Vrms.
Measurement conditions, unless otherwise specified: Op-
erating Voltage: 18 Vdc
Full gain
1 kHz input signal.
Output terminations: Line 600 :ꢂꢀ Mic 150 :ꢂꢀ
Tape Out 50 k:ꢁꢀHeadphoneꢀꢃꢄꢄꢀ:ꢅ
Input Channel Bi-Color LEDs
Green: Signal presence; visual indication of mix level.
Red: 6 dB below clipping level.
Output Peak/Limiter Bi-Color LEDs
Frequency Response
20 to 20,000 Hz r2.0 dB (channel controls centered).
Green: Output being limited by 1 dB or more.
Red: Output peak threshold reached; factory set at
+17 dBm; user adjustable from 0 to 17 dBm.
Voltage Gain
Output Clipping Level
t +18 dBm at line output into 600ꢀ:ꢅ
Input
Line
Mic
Headphone
Tape
Low-Z
Mic
(150 :)
78 dB
28 dB
89 dB
66 dB
Low–Cut Filters
6 dB down at 150 Hz; 6 dB/octave slope.
Line
28 dB
––
–22 dB
––
39 dB
11 dB
16 dB
––
Pan Attenuation Level
45 dB.
Monitor
Tone Oscillator
1 kHz r10%.
Inputs
Slate Tone Oscillator
400 Hz r10%.
IMPEDANCE
Input
Designed for
Use with
Actual
(Internal)
Input Clip
Level
Limiter
Threshold: Adjustable; 0 dBm to +15 dBm.
Mic
Line
19 to 600 :
d10 k:
1 k:
–10 dBV
+36 dBV
+21 dBV
Attack Time: 1 ms.
50 k:
10 k:
Release Time Constant: Selectable; 100 ms or 1 s.
Indicator: Green when limiting by 1 dB or more.
Monitor
d 1 k:
Microphone Power
12 V Phantom: 12 V through matched 680 :.
48 V Phantom : 48 V through matched 6.8 k:.
12 V T (A–B):12 V through matched 180ꢀ:.
Outputs
Input
IMPEDANCE
Mixer Power
Designed for
Use with
Actual
(Internal)
Output Clip
Level
Internal: Two 9 V alkaline batteries.
External: 12–30 Vdc to dc In jack; non–polarized.
Current Drain: Approximately 41 mA (idle) at 18 V.
Battery Life: 8 hours minimum, typical.
Mic
Low-Z
inputs
1 :
–31 dBV
Line
Tape
600 :
>10 k:
150 :
2.2 k:
300 :
+18 dBm
+3 dBV
Temperature Range
Operating: 0q to 60q C (32q to 140q F).
Storage: –40q to 85q C (–40q to 185q F).
Headphones
8 to 200 :
+11 dBV
Overall Dimensions (H x W x D)
58 mm x 184 mm x 161 mm (7–1/4 x 6–3/8 x 2–1/4 in.).
Total Harmonic Distortion
0.25% THD at +4 dBm output, 50 to 20,000 Hz.
Net Weight (without batteries)
1.6 kg (3.5 lbs).
Equivalent Input Noise
–127 dBV with 150 : source, 20 to 20,000 Hz.
FURNISHED ACCESSORIES
Carrying Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26A19
To wrap the carrying case around the FP33 mixer, refer
to the assembly instructions supplied.
Output Noise
Master level fully CCW: d –100 dBV, 20 to 20,000 Hz.
Master level fully CW: d –80 dBV, 20 to 20,000 Hz.
Shoulder Strap . . . . . . . . . . . . . . . . . . . . . . . . . . 95A8508
Connect the strap’s swivel hooks to the metal ears lo-
cated on the FP33 side panels.
Common Mode Rejection Ratio
65 dB at 100 Hz, –20 dBV input.
Mix Bus Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . 90A4313
A three-conductor, shielded cable 205 mm (8 in.) long
with a female 3-pin mini- connector at each end.
Polarity
Mic/Line In to Mic/Line Out
Mic/Line In to Headphones
Mic/Line In to Tape Out
Mic/Line to Mix Bus
Non-Inverting
Non-Inverting
Non-Inverting
Inverting
Rubber Feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66A8010
If desired, these adhering feet may be placed on the bot-
tom or the rear of the FP33 mixer.
Monitor In to Headphones
Non-Inverting
Spare Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . 187AJ06A
10
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ENGLISH
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nications. These limits are designed to provide reasonable
protection against harmful interference in a residential
installation. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause
harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harm-
ful interference to radio or television reception (which can
be determined by turning the equipment off and on), the
user is encouraged to try to correct the interference by one
or more of the following measures:
CERTIFICATION
Eligible to bear CE Marking. Conforms to European EMC
Directive 89/336/EEC. Meets applicable tests and perfor-
mance criteria in European Standard EN55103 (1996)
parts 1 and 2, for residential (E1) and light industrial (E2)
environments.
Note: Under extreme conditions of electrostatic dis-
charge to the VU Meter Lamp Switch, the VU meter
may illuminate. This is normal and causes no harm.
INFORMATION TO USER
1. Reorient or relocate the receiving antenna.
Changes or modifications not expressly approved by
Shure, Inc., could void your authority to operate this equip-
ment.
2. Increase the separation between the equipment and
the receiver.
3. Connect the equipment into an outlet on a circuit differ-
ent from that to which the receiver is connected.
This equipment has been tested and found to comply
with the limits for a Class B digital device pursuant to Part
15 of the FCC Rules and as set out in the Radio Interfer-
ence Regulations of the Canadian Department of Commu-
4. Consult your dealer or an experienced radio/TV tech-
nician.
11
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United States, Canada, Latin America, Caribbean:
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
Phone: 847-600-2000 U.S. Fax: 847-600-1212 Int’l Fax: 847-600-6446
Europe, Middle East, Africa:
Shure Europe GmbH, Phone: 49-7131-72140 Fax: 49-7131-721414
Asia, Pacific:
Shure Asia Limited, Phone: 852-2893-4290 Fax: 852-2893-4055
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