(5)
3. Connect the loudspeakers to the
CHANNEL A
and
CHANNEL B
SPEAKER OUTPUTS (9
,
11)
.
THE TOTAL SPEAKER LOAD MUST BE
AT LEAST 2 OHMS PER CHANNEL
. If you try to operate at a lower
impedance, the amplifier will go into
PROTECTION MODE
and stop
operation until you correct the load conditions.
4.
With the
LEVEL CONTROLS
(19, 20)
of both channels set to zero (fully
counterclockwise), turn the
POWER SWITCH (12) ON
. With the level
controls of your
MIXER
or other
INPUT
device turned all the way
DOWN
,
turn the amplifier level controls all the way up for desired loudness from
your speakers.
Note, when the
CLIP LED (17)
light, there is distortion
present in the amplifier’s output section. If a
CLIP LED (17)
remains on or
flashes repeatedly, reduce the signal level by lowering the input level control
for the channel that is clipping or reduce the level at the source.
5. Now adjust your
MIXER
or other
INPUT
source to your desired listening
level. You also have the choice of keeping the volume of both speakers
equal, or for certain situations you can adjust the volume so one side will
be louder than the other.
PARALLEL MONO OPERATION:
Follow these instructions for
PARALLEL MONO
operation using a single
input cable, and you will have the same monophonic signal on both the
CHANNEL A
and the
CHANNEL B
outputs. Each channel’s output is
controlled independently by that channel’s level control.
1. With the power off, set the
OPERATION MODE SWITCH (8)
to the
PARALLEL MONO
position. When the power is on, the
MONO LED (14)
on the front panel will light. If the
LED
does not illuminate, you have the
switch in the wrong position. Correct before continuing.
2. With the power off, connect your input cables to the
CHANNEL A
input
only using the either the
XLR INPUT JACK (5)
or
1/4" INPUT JACK (7)
of
CHANNEL A
. The other
CHANNEL A
input can be used to link to an
additional amplifier.
3. Connect the loudspeakers to the
CHANNEL A
and
CHANNEL B
SPEAKER OUTPUTS (9, 11)
.
THE TOTAL SPEAKER LOAD MUST BE
AT LEAST 2 OHMS PER CHANNEL
. If you try to operate at a lower
impedance, the amplifier will go into
PROTECTION MODE
and stop
operation until you correct the load conditions.
4.
With the
LEVEL CONTROLS
(19, 20)
of both channels set to zero (fully
counterclockwise), turn the
POWER SWITCH (12) ON
. With the level
controls of your
MIXER
or other
INPUT
device turned all the way
DOWN
,
turn the amplifier level controls all the way up for desired loudness from
your speakers.
Note, when the
CLIP LED (17)
light, there is distortion
present in the amplifier’s output section. If a
CLIP LED (17)
remains on or
flashes repeatedly, reduce the signal level by lowering the input level
control for the channel that is clipping or reduce the level at the source.
5. Now adjust your
MIXER
or other
INPUT
source to your desired listening
level. You also have the choice of keeping the volume of both speakers
equal, or for certain situations you can adjust the volume so one side will
be louder than the other.
MONO BRIDGE OPERATION:
Follow these instructions to bridge the unit’s outputs. Bridging the amplifier
converts the unit to a monophonic or single channel. The amplifier can be
used with
4Ohm
or higher loads only in
MONO BRIDGE
mode. This
mode is used to provide a higher voltage with greater headroom to your
speaker. Before setting your amplifier for
MONO BRIDGE
operation,
make sure that your speaker can handle the high power level provided by
the amplifier in
MONO BRIDGE
mode.
CAUTION: VOLTAGE OVER 100 VOLTS MAY BE PRODUCED AT THE BRIDGE OUTPUT
TERMINALS IN THIS MODE.
1. With the power off, set the
OPERATION MODE SWITCH (8)
to the
BRIDGE
position. When the power is on, the
BRIDGE LED (15)
on the
front panel will light. If the
LED
does not illuminate, you have the switch in
the wrong position. Correct before continuing.
2. With the power off, connect your input cables to
CHANNEL A
input only
using either the
XLR INPUT JACK (5)
or
1/4" INPUT JACK (7)
of
CHANNEL A
. The other
CHANNEL A
input can be used to link to an
additional amplifier.
3. Connect the loudspeaker to the
BRIDGE SPEAKER OUTPUT (10)
only.
The total speaker load must be at least
4 Ohms
or above. If you try to
operate at a lower impedance, the amplifier will go into
PROTECTION
MODE
and stop operation until you correct the load conditions.
4.
With the
CHANNEL A LEVEL CONTROL (19)
set to zero (fully
counterclockwise), turn the
POWER SWITCH (12) ON
. With the level
controls of your
MIXER
or other
INPUT
device turned all the way
DOWN
,
turn the amplifier level controls all the way up for desired loudness from
your speakers.
Note, when the
CLIP LED (17)
light, there is distortion
present in the amplifier’s output section. If a
CLIP LED (17)
remains on or
flashes repeatedly, reduce the signal level by lowering the input level
control for
CHANNEL A
or reduce the level at the source. During
MONO
BRIDGE
operation, the
CHANNEL B
level is inactive, however, both
channels
LED
will flash simultaneously and show output conditions.
5. Now adjust your
MIXER
or other
INPUT
source to your desired listening
level. You also have the choice of keeping the volume of both speakers
equal, or for certain situations you can adjust the volume so one side will
be louder than the other.
USING THE SIGNAL GROUND LIFT SWITCH:
Depending on your system configuration, sometimes applying the ground
will create a quieter signal path. Sometimes lifting the ground can
eliminate ground loops and hum to create a quieter signal path.
1. With the power amp on, listen to the system in idle mode (no signal
present) with the ground applied (the
SIGNAL GROUND LIFT
SWITCH (2)
in the left position).
2. Then turn the power off before moving the
SIGNAL GROUND LIFT
SWITCH (2)
. Lift the ground by moving the
SIGNAL GROUND LIFT
SWITCH (2)
to the right, turn the power back on and listen to determine
which position will provide a signal devoid of background noise and hum.
Keep the
SIGNAL GROUND LIFT
SWITCH (2)
in the ground position if
the noise level remains the same in either position.
CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWER AMPLIFIER IN ANY WAY.
TERMINATION OF THE AC GROUND CAN BE HAZARDOUS.
SPECIFICATIONS:
GXA-750
GXA-1600
Output Power EIA: 1 kHz @ 1% THD
Single Channel 8
Ω
190
340
Both Channels Driven 8
Ω
175
300
Single Channel 4
Ω
325
600
Both Channels Driven 4
Ω
275
500
Single Channel 2
Ω
470
950
Both Channels Driven 2
Ω
360
800
Mono Bridge 8
Ω
550
1000
Mono Bridge 4
Ω
750
1600
Dynamic Headroom:
8
Ω
1.3
1.3
4
Ω
2.3
2.1
Frequency Response.................................................................20 Hz - 20 kHz
Total Harmonic Distortion...........................................less than 0.01% @ 1 kHz
Intermodulation Distortion.........................................less than 0.02% (SMPTE)
Signal to Noise Ratio.....................................100 dB below rated power @ 8W
Damping Factor (
GXA-750
)..........................................greater than 500 @ 8W
Damping Factor (
GXA-1600
)........................................greater than 800 @ 8W
Slew Rate.............................................................................................16 V/mS
Voltage Gain..............................................................................................33 dB
Input Sensitivity (for rated power at 8 Ohm):
0.82 V
RMS
1.1 V
RMS
Input Impedance Unbalanced............................................................10 kOhms
Input Impedance Balanced................................................................20 kOhms
Power consumption:
550 VA
1000 VA
NOTE: POWER CONSUMPTION IS GIVEN AT RATED POWER AT 8
PER CHANNEL, BOTH CHANNELS DRIVEN.
AC Power Requirement:
(power connection is factory configured)...................120V/ 60 Hz 230V/ 50 Hz
Indicators:........................................1 Power Indicator, 1 Signal LED per channel,
1 Clip LED per channel, 1 Protect LED per channel, 1 Mono LED, 1 Bridge LED
Cooling:........................................2 Speed Dual Fan; Front-to-Rear Forced Air
Protection:......Short Circuit, DC, Thermal Cut-off, Sub/ultrasonic Frequency Filters,
In-rush Current Limiter, Turn-on Delay, main fuse, secondary DC supply fuses
Connectors:
Balanced/Unbalanced Inputs......................................................1/4" TRS Jack
Balanced Inputs.....................................................................XLR Female Jack
Speaker Outputs........................................Speakons (CH.A, CH.B and bridge)
Dimensions.........................................19" x 13.75" x 3.5" (483 x 350 x 89 mm)
Weight”
27 lbs
34 lbs
12.34 kg
15.5 kg
SPECIFICATIONS AND DESIGN ARE SUBJECT TO CHANGE
WITHOUT NOTICE FOR PURPOSE OF IMPROVEMENT.
