Realistic 120-1959 - Manual (Page 8)

Turn the FADER control clockwise to emphasize the front speakers. Turn it
counter-clockwise to emphasize the rear speakers.
Using The Power Meter
The POWER METER indicates the approximate amount of power that is being
delivered from the equalizer/booster to the speakers.
When the METER LEVEL button is out (low setting), use the marked power
levels (0.1, 0.3, 1.2, 2.0) to determine the power levels.
When the METER LEVEL button is in (high setting) multiply the marked
levels by 5 (0.5, 1.5, 3.6, 10.0).
Using A Portable CD Player With The Equalizer Booster
(See Faxback Doc. # 46863, Fig. C.)
You can connect a portable CD player, or any other audio component with a
headphone jack, to the equalizer/booster and listen to it through your
auto-sound system. You need a patch cable with a 1/8 inch stereo mini
phone plug on one end and a plug that matches the portable player's
headphone jack on the other end.
1. Turn off the equalizer/booster and the portable CD player (or other
component you are using).
2. Plug one end of the patch cable into the equalizer/booster's CD jack
and the other end into the CD player (or other portable component).
3. Adjust the CD player's volume control to minimum and begin play of a
disc.
4. Adjust the CD player's volume control for the desired listening level.
Note: The radio/tape player is internally disconnected from the equalizer/
booster when you plug a patch cable into the CD jack. You must
unplug the patch cable to listen to the radio/tape player.