User Guide

In order to achieve maximum signal-to-noise performance from

a high quality auto stereo system, it is desirable to use high

signal levels wherever possible in the interconnect cables. High signal

levels will reduce the effect of induced noise. The peak level of an

audio signal is usually determined by the clipping level of electronic

components. The following procedure should be used as a guide

before the system installation is completed.

Adjustment of source unit output and

PAR-245

input:

1. Turn

PAR-245

volume control fully counterclockwise.

2. Turn source unit volume 1/2 to 3/4 of maximum.

3. Adjust all

PAR-245

input gains fully counterclockwise.

4. Play a CD or cassette. A loud music selection is desired.

5. Adjust the left input gain control clockwise until the

input clip LED lights. Then adjust the control

counterclockwise slightly until the LED doesn't light. This

setting will minimize system background noise and

prevents overloading the

PAR-245

6. Repeat Step 5 for the right input gain control.

There are separate left and right gain adjustments

for each input which allows left/right balance

adjustments.

Adjusting amplifier input gains:

1. Adjust gains to minimum sensitivity (fully

counterclockwise on the gain control of a

PPI

amplifier.)

2. Turn the volume knob on the

PAR-245

to the

3 o'clock position.

3. Increase the gain on the amplifier until the onset of

audible distortion.

4. Repeat step 3 for any remaining amplifiers in the

system.

NOTE: In many multi-amplifier systems, the gain of some

amplifiers may need to be further decreased to

achieve tonal balance.

System Gain Adjustment

SYSTEM TUNING

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