85 x 4 4-Channel Trunk Mount Amplifier
(120-1977)                  Operation                 Faxback Doc. # 16922

TURNING ON THE AMPLIFIER

The amplifier automatically turns on whenever you turn your vehicle's
ignition switch to ACC or ON.  POWER lights when the amplifier is
operating.

SETTING THE LEVEL CONTROL

For the best performance, you can adjust the level of audio signals that
enter the amplifier by following these steps.

CAUTIONS:  When the amplifier's internal temperature reaches 202 degree F,
           the automatic thermal protection system lowers the amplifier's 
           output power until it cools down.

           The sound distorts if any output channel shorts.  Turn off the 
           amplifier and try to locate the short.

           To prevent draining the vehicle's battery, do not operate the 
           amplifier using the ignition switch's ACC position for too long
           after turning off the vehicle's ignition.

1.  Turn both LEVEL MIN/MAX controls fully counter clockwise to MIN.

    NOTE:  The right level control adjusts the inputs to CH1 and CH2
           (normally the front) and the left level control adjusts the
           inputs to CH3 and CH4 (normally the rear).

2.  Temporarily turn up the autosound system's volume control to about
    one-third of its full range.

    CAUTION:  Never turn the level controls up any farther than you need
              to get clear sound at two thirds volume maximum.

3.  Turn the left and right LEVEL controls clockwise until you can hear
    the sound at a comfortable level.

4.  Turn up the volume on your autosound system-until the sound begins to
    distort.  Then immediately turn down the volume to the point just below
    where distortion began.

5.  Adjust the level controls until the volume is at the maximum level you
    want the autosound system to produce.

6.  Adjust the autosound system's volume control to a comfortable listening
    level.

USING THE FREQUENCY CROSSOVER

X-OVER FREQ On/Off Switch

To use the amplifier's crossover function with a subwoofer, push in X-OVER
FREQ to On.  To use the amplifier without a subwoofer, push and release
X-OVER FREQ to Off.

X-OVER FREQ Control

When you push in X-OVER FREQ to On, the X-OVER FREQ 45 Hz/400 Hz lets you
adjust the crossover frequency from 45Hz to 400 Hz for Channels 3 and 4 so
you can adjust the sound to compensate for your vehicle's acoustics.

NOTE:  Since this only controls the 45-400 Hz frequencies, this control
       is useful only for subwoofers and not your main speakers.