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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 (3) to the
PARALLEL MONO position. When the power is on, the MONO LED
(12) 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
(4) 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 4 OHMS PER CHANNEL. If you try to operate at less than 4
Ohms per channel, the amplifier will go into the protection mode and
stop operation until you correct the load conditions.
4. With the LEVEL CONTROLS (17, 18) set to zero (fully
counterclockwise), switch the power on. Apply a signal to the input.
The level of the input signal should be as high as you will ever need it
to be. This way, it will be as high above the amplifier’s noise floor as
possible, ensuring an excellent performance and signal to noise ratio.
Adjust the LEVEL CONTROLS for each channel to achieve the
desired maximum listening level. Note, when the clip LEDs light,
there is distortion present in the amplifier’s output section. If a clip
LED 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.
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 8 Ohm 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 (3) to the
BRIDGE position. When the power is on, the BRIDGE LED (13) 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 the either the XLR INPUT JACK (5) or 1/4" INPUT JACK (4) 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. With a 230V unit, use the center speakon. With a 120V unit, use
the two innermost red terminals. Be sure the polarity of your
connections is correct. The total speaker load must be at least 8
Ohms or above. If you try to operate at less than 8 Ohms in the Mono
Bridge mode, the amplifier will go into the protection mode and stop
operation until you correct the load conditions.
4. With the CHANNEL A LEVEL CONTROL (17) set to zero (fully
counterclockwise), switch the power on. Apply a signal to the input.
The level of the input signal should be as high as you will ever need it
to be. This way, it will be as high above the amplifier’s noise floor as
possible, ensuring an excellent performance and signal to noise ratio.
Adjust the LEVEL CONTROL (17) for channel A to achieve the
desired maximum listening level. Note, when the clip LEDs light,
there is distortion present in the amplifier’s output section. If a clip
LED 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 LEDs will flash simultaneously and
show output conditions.
Using the 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 GROUND LIFT SWITCH (8) in
the left position).
2. Then turn the power off before moving the GROUND LIFT
SWITCH (8). Lift the ground by moving the GROUND LIFT SWITCH
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 GROUND LIFT SWITCH 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.
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