QUADRAPHONIC QUAD4 User Manual - page 12
11
Copyright 2016 Retro Manufacturing, LLC
1. Front and Rear HPF/FULL Electronic Crossover
These switches activate the built-in electronic crossover network.
When set to HPF (High Pass Filter), the crossover limits bass frequencies,
sending only those frequencies above 100Hz to the speakers. This is
useful in a system in which a separate subwoofer is used to reproduce
bass frequencies. When set to FULL, the full spectrum of music is sent
to the connected speakers.
2. Front and Rear Gain Control
This control is used to match the input sensitivity of the amplifier to the
radio. The Gain Control is not a volume control. Use the source unit to
control system volume. Failure to follow the steps above could result
in damaged speakers and/or amplifier. Use these steps to set the
Gain Control:
A. Set the Gain Control to minimum by turning the Level
Control knobs completely counter clockwise.
B. On the radio, set the Bass and Treble to zero, and adjust
the volume to approximately 2/3 of maximum.
C. Slowly increase the amplifier’s Gain Control clockwise by turning
the knob until the sound has just begun to distort. Then turn the
Gain Control counterclockwise slightly to cut distortion. This
will allow the amplifier to operate at maximum efficiency.
3. Power
When the power is on, the LED indicator will illuminate in blue.
Input Side
Output Side
CONTROL PANEL LAYOUT
3
1
2
2