Alto Professional APX1500 - Manual (Page 3)

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WARNING!: Do not adjust the
STEREO/MONO BRIDGE SWITCH when the
amplifier is on
.
How do I know if my 1/4" cables
are balanced?
BALANCED
UNBALANCED
REAR PANEL DIAGRAM
PUSH PUSH
1
2
3
4
5 5 5 5
6
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1. COOLING FAN- This fan secures cooling for the amplifier. The airflow is from front to rear. The fan speed is
electronically regulated depending on the temperature of the power devices. Do not block these fan grills or
mount the amplifier in an enclosed rack, which could cause the amplifier to overheat.
2. LOW PASS FILTER – This switch activates the built-in low cut filter. All audio below 30 Hz will be removed
from the output signal.
3. BALANCED COMBO INPUTS – Connect your mixer to the balanced XLR or balanced 1/4" input for that
channel.
4. OUTPUT MODE SWITCH – The APX 1500 presents three operating
modes:
Stereo Mode
In this mode, CH 1 and CH 2 operate independently (as a normal
stereo amplifier) The CH 1 input signal will be output from the CH A
output connector, and CH 2 input signal will be output
from the CH 2 output connector.
Parallel Mono Mode
In this mode, CH 1 input signal will be output from the
output connectors of both
channels.
Bridged Mode
In this mode, CH 1 input signal will be output from the
bridge-mono output connector.
5. CHANNEL OUTPUTS – Connect your speakers' input
jacks to these outputs.
• For the binding posts, red is the positive signal and
black is the negative signal.
Please make sure to
respect the speaker polarity when using binding
post.
Turn off the unit before connecting an audio signal to the binding post to avoid any electric shock!
• The SPEAKON outputs are specifically designed to connect to high power speakers. The correct polarity
is secured automatically. They prevent shock hazard and they lock-in securely.
6. POWER IN – Connect the cable to a standard wall outlet. Be sure the supplied voltage matches the required
voltage of the amplifier. Do not connect the amplifier to an outlet that does not match the required voltage;
doing so could damage the amplifier.
WARNING!: Do not allow any wires of
adjacent terminals to come in contact with each
other. Also, do not connect either positive
(red) output to chassis ground.