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R R e e a a r r P P a a n n e e l l
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T T h h e e I I n n s s a a n n d d O O u u t t s s o o f f M M o o d d e e S S e e l l e e c c t t i i o o n n
Once you have provided proper AC power to the amplifier, you may now connect to the inputs and outputs.
Remember to do this while the power to the unit is turned off (Power LED are not lit). The rear panel of your GPS
Series amplifier provides a central location for all input and output connections. Regardless of the GPS model, all
input connections are located at the bottom-center portion of the rear panel and all output connections are
located at the top-center portion. In addition, your amplifier can operate in either stereo or bridged (mono) mode.
All GPS Series amplifiers have DDT compression. However, only GPS models 900 and 1500 have a switch to defeat
this feature. This section will describe these areas of your GPS Series amplifier in detail.
M M o o d d e e S S e e l l e e c c t t i i o o n n
4 4 . .
M M o o d d e e s s w w i i t t c c h h
This switch determines which mode your amplifier will operate in. Before connecting your input signal and
speaker cables to the amp, you must determine how you want the amp to function. Two modes of operation
are offered on your amplifier, stereo or bridged (seperate).
Stereo:
When we use the term "stereo" we are referring to two channels, not necessarily left and right. Therefore,
in "stereo" mode there are essentially two power amps regardless of input type. You may use a stere input,
one stereo input to each channel of the GPS, or you may send two mono inputs to the GPS in the same
manner. A good example of two separate inputs would be the use of one channel for mono mains and one
channel for mono monitor signals. In order to select the "stereo" mode of operation you must place the
Mode Switch in the "out" position. In this mode, Channel A Output is supplied by the Channel A Input.
Channel B Output is supplied by Channel B Input.
Bridged or Mono:
In the "bridge" mode the two channels of the amplifier combine to form a single mono channel. The benefit
of using your amplifier in this mode is that the power is doubled. Refer to the specifications in this manual
for detailed output power specs on your specific model. To use the GPS Series amp in "bridge" mode, place
the Mode Switch to the "in" position where the switch remains down. The amp is now a mono amplifier and
only requires a single input. Plug your input signal into Channel A only for "bridge" mode operation.
Channel B input must not have anything connected.
Note for GPS 900 and 1500:
When these models are switched to "bridge" mode, the Power LED (3) for Channel B will no longer
illuminate.
N N o o t t e e : : Refer to the Outputs section for an explanation of how the Mode Switch affects the speaker outputs.
I I n n p p u u t t s s
5 5 . .
C C h h a a n n n n e e l l A A C C o o m m b b i i n n a a t t i i o o n n I I n n p p u u 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 offer both XLR electronic balanced and phone jack quasi-balanced inputs for
each channel using Neutrik
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6
7
5
®
's new "combo" connector to save panel space.
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