Peavey GPS 900 Operation Manual page 10

D D O O N N O O T T B B L L O O C C K K T T H H I I S S E E X X H H A A U U S S T T P P O O R R T T ! ! During the operation of your GPS Series amplifier, it will require fresh
air intake in order for the tunnel cooling to function properly. Blocking this air exhaust port or the air intake
ports on the rear could result in thermal shutdown of your amplifier.
O O p p e e r r a a t t i i o o n n N N o o t t e e s s
A A C C M M a a i i n n s s C C i i r r c c u u i i t t S S i i z z e e R R e e q q u u i i r r e e m m e e n n t t s s
Power requirements for the GPS Series amplifiers are rated at "typical" music conditions. The maximum
power current draw rating is limited by the amplifier's circuit breaker. Consult the specification sheet for
the current that each amplifier will demand. AC mains voltage must be the same as that indicated on the
back of the amplifier. Damage caused by connecting the amplifier to improper AC voltage is not covered by
any warranty.
L L i i n n e e C C o o r r d d
For your safety, we have incorporated a removable 3-wire line (mains) cable with proper grounding
facilities. It is not advisable to remove the ground contact under any circumstances. If it is necessary to use
the equipment without proper grounding facilities, suitable grounding adapters should be used. Less noise
and greatly reduced shock hazard exists when the unit is operated with the proper grounded receptacles.
NOTE: Always turn off the amplifier before making audio connections. As an extra precaution, have the
input attenuator turned down during power-up.
C C O O O O L L I I N N G G R R E E Q Q U U I I R R E E M M E E N N T T S S ( ( G G P P S S 9 9 0 0 0 0 a a n n d d 1 1 5 5 0 0 0 0 ) )
These GPS Series amplifiers use a forced-air cooling system to maintain a low, even operating temperature.
Cooling air is drawn by synchronized, variable-speed fans mounted on the back panel, and exhausts
through slots on the front panel. The fans will remain at low speed until internal operating temperature
0
rises above 45 C. Make sure that there is enough space around the back of the amplifier to allow air to
0
enter. The normal operating temperature is 55 C. This is a very cool temperature when compared to most
amplifier standards. What this means to you is a noticeable increase in product life. On the GPS 900 and
1500 models, the fans will turn on simultaneously when temperature activated.
C C O O O O L L I I N N G G R R E E Q Q U U I I R R E E M M E E N N T T S S ( ( A A l l l l m m o o d d e e l l s s e e x x c c e e p p t t G G P P S S 9 9 0 0 0 0 a a n n d d 1 1 5 5 0 0 0 0 ) )
These GPS Series amplifiers use a forced-air cooling system to maintain a low, even operating temperature.
Cooling air is drawn by continuously variable speed fans mounted on the back panel, and exhausts through
slots on the front panel. The fan will remain inactive until internal operating temperature rises above 45 0 C.
Make sure that there is enough space around the back of the amplifier to allow air to enter. The normal
0
operating temperature is 55 C. This is a very cool temperature when compared to most amplifier standards.
What this means to you is a noticeable increase in product life.
N N O O T T E E : : If the amplifier is rack-mounted, do not use doors or covers on the front or back while the unit is in
operation. Whatever type of rack you are using, make sure that heated air can escape freely, and that there
is no resistance to the intake of cool air through the back grill. Intake and exhaust air must flow without
resistance.
I I N N P P U U T T C C O O N N N N E E C C T T I I O O N N S S
The input connector accepts balanced and unbalanced audio signals. For use with an unbalanced source,
tie the inverting (-) input to ground by installing a jumper to the signal ground connection. If the inverting
input is left floating, a 6 dB loss in gain will result.
S S I I G G N N A A L L M M O O D D E E C C O O N N F F I I G G U U R R A A T T I I O O N N
GPS Series amplifiers are configured for two-channel (stereo) or bridged mode operation at the input
connectors and via Mode Switch. To send the same signal to both channels, connect the input signal to
Channel A via the input connector. Run a jumper from the Thru jack of Channel A to the input of Channel B.
Both channels then share Channel A's input signal, but will operate independently. Speakers are connected
as in two-channel (stereo) mode.
Bridged mode converts the amplifier into a single-channel unit with a power rating equal to the sum of
both channels' power ratings, and at a load rating of twice that of the single-channel rating. In bridged
mode, the channels operate at opposite polarity of each other so that one channel "pushes" and the other
"pulls" equally. Signal is connected to the Channel A Input connector. The speakers are connected only to
the designated "+" output terminals. Never ground either side of the speaker cable when the amplifier is in
bridged mode, as both sides are "hot". For GPS Series amplifiers, the minimum nominal load impedance in
bridged mode is 4 Ohms (8 Ohms for GPS 3500); this is the equivalent of driving both channels at 2 Ohms
(4 Ohms for GPS 3500).
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