O W N E R ’ S M A N U A L
SPA Series
Stereo Power Amplifiers
Download from Www.Somanuals.com. All Manuals Search And Download.
WARNING
An equilateral triangle enclosing a lightening flash/arrowhead symbol is
intended to alert the user to the presence of uninsulated “dangerous
voltage” within the product’s enclosure which may be of sufficient
magnitude to constitute a risk of electric shock.
ATTENTION: RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR
An equilateral triangle enclosing an exclamation point is intended to alert
the user to the presence of important operating and service instructions in
the literature enclosed with this unit.
IMPORTANT SAFETY INSTRUCTIONS
When using this electronic device, basic precautions should always be taken, including the following:
1. Read all instructions before using the product.
2. Do not use this product near water (e.g., near a bathtub, washbowl, kitchen sink, in a wet basement, or near a
swimming pool, etc.).
3. This product should be used only with a cart or stand that will keep it level and stable and prevent wobbling.
4. This product, in combination with headphones or speakers, may be capable of producing sound levels that
could cause permanent hearing loss. Do not operate for a long period of time at a high volume level or at a
level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should consult an
audiologist.
5. The product should be positioned so that proper ventilation is maintained.
6. The product should be located away from heat sources such as radiators, heat vents, or other devices
(including amplifiers) that produce heat.
7. The product should be connected to a power supply only of the type described in the operating instructions or
as marked on the product. Replace the fuse only with one of the specified type, size, and correct rating.
8. The power supply cord should: (1) be undamaged, (2) never share an outlet or extension cord with other
devices so that the outlet’s or extension cord’s power rating is exceeded, and (3) never be left plugged into
the outlet when not being used for a long period of time.
9. Care should be taken so that objects do not fall into, and liquids are not spilled through, the enclosure’s
openings.
10. The product should be serviced by qualified service personnel if:
A.
B.
The power supply cord or the plug has been damaged.
Objects have fallen into, or liquid has been spilled onto the product.
C. The product has been exposed to rain.
D. The product does not appear to operate normally or exhibits a marked change in performance.
E.
The product has been dropped, or the enclosure damaged.
11. Do not attempt to service the product beyond what is described in the user maintenance instructions. All
other servicing should be referred to qualified service personnel.
4
Download from Www.Somanuals.com. All Manuals Search And Download.
FRONT AND REAR CONTROLS
4
1
2
3
5
FRONT PANEL
1. POWER SWITCH
amplifier’s output are within 3DB of clipping. Occasional
blinking of the LEDs are acceptable, but if they remain on
more than intermittently you should turn down either the
power amplifier’s level controls or reduce the output level
of the preceding component to avoid audible distortion.
To turn the unit ON or OFF, press the upper or lower
portion of this button. Before turning on the amplifier, check
all connections and turn down the level controls. A
momentary muting is normal when turning the amplifier on
or off.
4. SIGNAL LED INDICATORS
(Caution: Always turn on your power amplifier last, after all
your other connected equipment, and always turn off your
power amplifier before your other connected equipment.)
These LEDs illuminate to confirm the presence of an input
signal greater than 100 mV at that channel of the amplifier
5. LEVEL CONTROLS
2. POWER LED INDICATOR
This LED illuminates when the power is turned “ON”.
These control the level of signal coming into each channel.
The actual voltage gain of the amplifier is shown in dB.
Turn these controls counterclockwise if the peak LEDs
illuminate steadily (indicating too strong an input signal).
3. CLIP (PEAK) LED INDICATORS
These LEDs illuminate if any section of the power
7
6
9
8
REAR PANEL
6. CIRCUIT BREAKER
9. AC VOLTAGE SELECTOR SWITCH:
A bimetallic circuit breaker is provided for protection of the
amplifier. Press to reset if it trips. If it continuously trips
upon resetting, refer servicing to qualified personnel.
Before plugging in the power cord, check to see that the
unit is set for the proper voltage for your area: ~115V
(60Hz) or ~230V (50Hz). A cover plate is provided to
ensure that this switch is not accidently reset or tampered
with between uses.
7. POWER CONNECTOR
The cord connector is used to connect the AC power
source to your power amplifier.
(CAUTION: DO NOT REMOVE THE CENTER
GROUNDING PIN.)
10. L/R CHANNEL OUTPUT CONNECTORS
(Speakon™ & Binding Posts)
The Speakon™ and binding post (banana jack) outputs are
compatible with a speaker load of 2 Ω or greater (4Ω or
greater for bridged operation). Connections are as
depicted on the rear panel and in the following
CONNECTIONS section on page 8 of this manual.
8. GROUND LIFT SWITCH:
Switch to right to disconnect the chassis from ground if
necessary to eliminate hum caused by ground loops.
5
Download from Www.Somanuals.com. All Manuals Search And Download.
FRONT AND REAR CONTROLS
11. BALANCED INPUT CONNECTORS
(Note: Do not use both unbalanced and balanced
cables in the same set-up as that can unbalance all
the connections when daisy-chaining, resulting in
hum.)
(1/4” TRS & XLR)
These 1/4” (6.3mm) TRS (Tip/Ring/Sleeve) phone jacks
and XLR jacks are compatible with balanced inputs and
are wired as Tip/Pin 3 = (+), Ring/Pin 2 = (-), and
Sleeve/Pin 1 = Ground. Normal maximum input level at
clipping is 1.15V RMS (+ 4dB). Input impedance is 10K
Ohms. Since the TRS phone jacks and XLR jacks are
wired internally in parallel, you can parallel this unit with
another amplifier by using either the LINE 1/4” jack or the
XLR jack (depending on which you’re using to input your
signal) to output the signal to the input jack of the other
amplifier.
• STEREO INPUT — This is the most common
mode generally used, and allows independent
control of 2 separate signals such as stereo
playback, main and monitor live mixes, and bi-amp
operation (highs in one channel and lows in the
other).
• BRIDGED MONO — This mode combines the
power of both channels to drive a single speaker. In
this mode the amp produces 4 times the peak power
and 3 times the sustained power into a 4 or 8 ohm
speaker than each channel can deliver separately in
stereo or parallel mode.
(CAUTION: In this mode the amplifier can deliver
high power into a speaker. Make sure that the
speaker, connectors and wiring can handle this
output. Note that for prolonged overdriven outputs
into a 4 ohm speaker the breaker may trip, so care
must be taken not to overload the amplifier in such
operation.)
The 1/4” TRS phone jacks can also be used for
unbalanced inputs. For TRS phone plugs, simply connect
the unused side of the balanced input to ground. For 1/4”
TS phone plugs, no change is necessary for compatibility
with this input. Balanced input signals are recommended
as they are less prone to AC hum. For long cable runs a
source of less than 600 ohms output impedance is needed
to avoid signal loss. For short cable runs an unbalanced
signal input should be suitable.
For stereo (two-channel) operation, use the inputs for both
CH-A and CH-B; for parallel or bridged mono operation,
use only CH-A input. (See 13-MODE SELECTOR
SWITCHES below for more explanation.)
Connect the input signal to CH-A input for bridged
mono operation.
14. LF FILTER (30HZ) SWITCH
12. CLIP LIMITER SWITCH
The low frequency LF filter rolls off frequencies below
30Hz when this switch is turned to the ON position. This
filter improves the audio by limiting unwanted inaudible low
frequency speaker cone movement. Unless a preceding
device, such as a mixer, already has such a 30Hz roll-off,
this filter should generally be employed for optimum audio
and to protect your speaker from excessive cone
excursions beyond its rated limit at sub-audio frequencies.
Generally this switch should only be left “OFF” if you are
monitoring the whole signal for frequency content, such as
for studio playback.
This switches the internal Clip Limiter ON or OFF for both
channels. The limiter prevents excessive signals from
overloading the amplifier (and thus flattening the peaks of
the waveform and introducing distortion) by automatically
lowering the amplifier gain to minimize overdrive. This
limiting is primarily used to protect full-range speakers
from high frequency distortion or damage to the horns
caused by bass overdrive. However, when driving a
subwoofer, defeating the limiter can produce a desired
extra “punch” to bass instruments, such as kick drums.
13. MODE SELECTOR SWITCH
15. FAN
The SPA Series amplifiers offer 3 modes of operation:
PARALLEL, STEREO & BRIDGED. Slide the switch to
one of the three positions for you application.
The fan speed is varied continuously automatically to
maintain the proper internal operating temperature. Rear-
to-front airflow keeps amps and racks cool.
• PARALLEL (MONO) INPUT
This mode allows
—
both channels to operate in parallel with the same
signal and without requiring a Y-cord. In this mode
the inputs for both channels are internally connected,
so that you only need to feed a signal into one of the
channels. This still allows independent control of
each channel. It also enables easy “daisy-chaining”
with other amps by using the other set of input
connectors.
(Note: Do not select this “Parallel” mode when
feeding the amplifier 2 separate signals.)
6
Download from Www.Somanuals.com. All Manuals Search And Download.
INSTALLATION
Rack Mounting
The SPA Series amplifiers are designed for standard 19”
rack mounting as well as “stack” mounting without a
cabinet. Use 4 screws and washers for mounting to the
front rack rails. It is also a good idea to support the amps
also in the rear, especially for mobile use where the amps
will be subjected to shocks.
Internal Fuses for SPA 850/1400
Amplifier Cooling
Also pay close attention to the cooling requirements. Since
the airflow is from the rear to the front, it is important to
keep both the inlet in the rear and the output in the front
clear of obstructions to enable efficient cooling airflow.
Since the amp exhausts to the front it does not contribute
to heat buildup in the rear of the rack. It is important,
however, that the other devices used in the rack allow
plenty of cool air in the rear to enable proper cooling of the
amp. Never block the air vents in the sides and front of the
amplifier if the load seen by amplifier is less than 4 ohms
and the amplifier is being run at high output levels. For
best results, in such high output power applications you
should augment the amplifier’s air flow with a rack cooling
system.
SPA 850 10A/250V (x2)
SPA 1400 12A/250V (x2)
both 3AG Fast Blow
Internal Fuse Protection
Each of the SPA Series amplifiers has backup internal
fuse protection on each channel on the secondary output
circuitry of the power transformer. In almost all cases of
power overload the external back panel circuit breaker,
which is wired in the primary power input circuit of the
power transformer, will trip before the internal fuses blow.
Nevertheless, these fuses are valuable in that they can
sometimes isolate the problem to a single channel,
allowing operation of the other channel. Also, because
they require added effort to rectify, they increase the
vigilance of the operator in correctly eliminating the cause
of the overload problem before further use. These fuses
are located inside the units and require removal of the top
of the chassis.
Internal Fuses for SPA 2400
CAUTION: Never open the unit when connected to AC
power as you can be severely shocked resulting in serious
injury or even death. Please wait at least 5 minutes after
disconnecting the unit from AC power to let any internal
capacitors discharge before opening. )
SPA 2400 25A/250V (x2)
both 3AG Fast Blow
Replace the fuse with the same type, size and power
rating as noted in the illustration for your SPA Series amp.
If it continuously blows, stop replacing the fuse and refer
servicing to qualified personnel.
7
Download from Www.Somanuals.com. All Manuals Search And Download.
CONNECTIONS
The following instructions describe the most common ways to install your amplifier into a sound system.
1. Turn off the amplifier power switch before making any connections.
2. The SPA Series amplifiers maybe operated in one of three modes (stereo, bridged-mono, and parallel mono).
Refer to the following wiring diagrams for the speaker connections you wish to make.
(Note: Nady Systems assumes no liability for damaged speakers resulting from improper wiring, careless amplifier
use, or over powering.)
Input Wiring Tips
UNBALANCED USE OF
MONO 1/4” PLUGS
BALANCED USE OF
STEREO 1/4” PLUGS
MICROPHONE INPUTS
Tip =
Signal
Tip =
hot (+)
2
1
1
2
Ground (Screen)
3
3
Ring =
cold (-)
Cold (-)
(Out of Phase Signal)
Sleeve =
Ground/Shield
Hot (+)
(In Phase Signal)
Sleeve =
Ground/Shield
Socket (female)
Plug (male)
Tip
Tip
Ring
Sleeve
Sleeve
Strain relief
clamp
Strain relief
clamp
• Stereo (Two-Channel) Mode
To put the amplifier into stereo mode, first turn the amplifier off, then slide the mode selector switch (13) to the center
“STEREO” position, and properly connect the input/output wiring as shown.
(Note: Do not connect a speaker load less than 2 ohms as it can damage your amplifier.)
CHANNEL B
CHANNEL A
CHANNEL B
PIN 1+
+
(Note: You can also connect
both channel outputs to the
-
PIN 1-
CHANNEL A
Channel A Speakon™. Ch A
Pin2+ = ChB Pin1+ and Ch A
Pin2- = Ch B Pin1-)
PIN 1+
+
-
PIN 1-
8
Download from Www.Somanuals.com. All Manuals Search And Download.
CONNECTIONS
• Parallel (Mono) Mode
To put the amplifier in parallel-mono mode, first turn the amplifier off, then slide the mode selector switch (13) to the
left “PARALLEL (MONO)” position and properly connect the input/output wiring as shown. A signal into any input jack
will drive both channels directly. You can patch the input signal on to any other amps suing any of the remaining input
jacks.
(Note: Do not connect a speaker load less than 2 ohms as it can damage your amplifier.)
[Note: Do not use the “PARALLEL (MONO)” switch when feeding the amp 2 separate signals.]
To additional amplifier(s)
for “daisy-chaining
CHANNEL A
CHANNEL B
PIN 1+
+
(Note: You can also connect
both channel outputs to the
-
PIN 1-
CHANNEL A
Channel A Speakon™. Ch A
Pin2+ = ChB Pin1+ and Ch A
Pin2- = Ch B Pin1-)
PIN 1+
+
-
PIN 1-
• Bridged Mono Mode
To put the amplifier in bridged mono mode, turn the amplifier off and slide the mode selector switch (13) toward the
right “BRIDGED” position and properly connect the input/output wiring as shown. The signal is input into CH-A. Keep
the level control of channel “B” turned completely down (counter clock wise).
(Note: Do not connect a speaker load of less than 4 ohms as it can damage your amplifier.)
(Note: This mode produces a large amount of power. Be sure that your wiring and speaker can handle it.)
Do Not Use
CHANNEL A
Do Not Use This Speakon™
for Bridge Mode
CHANNEL A
PIN 1+
+
-
PIN 2+
9
Download from Www.Somanuals.com. All Manuals Search And Download.
BLOCK DIAGRAM
10
Download from Www.Somanuals.com. All Manuals Search And Download.
SPECIFICATIONS
POWER SPECIFICATIONS
SPA 850
SPA 1400
800
SPA 2400
1400
2Ω
425
350 + 350
200 + 200
600
EIA out power
4Ω
8Ω
500 + 500
300 + 300
1000
750 + 750
500 + 500
1600W
1Hz, THD maximum 1%
Both channels
Bridged 8Ω
4Ω
850
1400
2400
ELECTRICAL SPECIFICATIONS
SPA 850
SPA 1400
SPA 2400
INPUT SENSITIVITY
1.15V (+3.4dBU)
1.15V (+3.4dBU)
1.15V (+4dBU)
INPUT IMPEDANCE
10KΩ Unbalanced & Balanced
25Hz~25KHz +0/-1dB
FREQUENCY RESPONSE
(at 10dB below rated output power
-3dB points: 5Hz~50KHz
VOLTAGE GAIN
DISTORTION (SMPTE-1M)
S/N ratio
30dB
<0.03%
100dB
32dB
<0.03%
100dB
34dB
<0.03%
100dB
GENERAL SPECIFICATIONS
SPA 850
SPA 1400
SPA 2400
Full short circuit, open circuit, thermal, ultrasonic, and RF
protection; stable into reactive or mismatched loads;
ON/OFF muting; current limiter (crowbar)
Front: Power switch, 40 detent input level control for each
channel. Rear: Parallel/Mono/Bridge selector, 30Hz filter
selector, clip ON/OFF selector, ground lift switch,
AC voltage selector switch, AC breaker
SIGNAL: 2 x green LED
PROTECTIONS
CONTROLS
INDICATORS
CONNECTORS
CLIP: 2 x red LED
POWER: 1 green LED
POWER: IEC power cord jack
INPUT: Active balanced XLR and 1/4” (6.3mm) TRS
OUTPUT: “Touch-proof” binding posts
SPEAKON™ Connectors
POWER SUPPLY
Voltage selectable: 110-120V or 220~240V AC 50/60Hz
FUSES
AC Primary — Rear Panel Breakers
11A
15A
20A
10A/250V, 3AG,
Fast Blow (x 2)
12A/250V, 3AG,
Fast Blow (x 2)
25A/250V, 3AG,
Fast Blow (x 2)
AC Secondary — Internal Fuses
DIMENSIONS
WEIGHT
19.0” x 15.7” x 3.5” (483 x 400 x 88.8mm)
29.9lb (13.6Kg) 34.3lb (15.6Kg)
41.8lb (19Kg)
The specifications above are correct at the time of printing of this manual. For improvement purposes, all specifications for this unit,
including design and appearance, are subject to change without prior notice.
11
Download from Www.Somanuals.com. All Manuals Search And Download.
SERVICE FOR YOUR NADY AUDIO PRODUCT
(U.S.) Should your NADY AUDIO product require service, please contact the Nady Service Department via
telephone at (510) 652-2411, or e-mail at [email protected].
(International) For service, please contact the NADY AUDIO distributor in your country through the dealer from
whom you purchased this product.
DO NOT ATTEMPT TO SERVICE THIS UNIT
YOURSELF AS IT CAN BE DANGEROUS
AND WILL ALSO VOID THE WARRANTY.
NADY SYSTEMS, INC. • 6701 SHELLMOUND STREET, EMERYVILLE, CA 94608
Download from Www.Somanuals.com. All Manuals Search And Download.
|