Realistic 120-1959 - Manual (Page 4)

Note: You must reset the clock, digital tuner memories for the radio,
and any other timer/memory devices when you reconnect the
battery wire after wiring is complete.
2. Connect the equalizer/booster's black (ground) wire to a nearby part
of the vehicle's metal frame.
Note: Many parts of modern vehicles are made of plastic or other
materials that do not conduct electricity. You must connect
the black wire to a metal part that is not insulated from the
vehicle's frame by one of these non conducting parts.
3. Connect the speaker wiring harness(es) (not included) to the speakers
in your vehicle as shown in Faxback Doc. # 46863, Fig. A.
If the speaker wires already exist, you can splice the 5 pin connector
for the supplied wiring harness(es) onto the existing speaker wires.
These connectors make installation easier and make removal of the
equalizer/booster (for service or maintenance) easier.
CAUTION: If you use existing speaker wiring or if you run new wires,
be sure that chassis ground is not used for any speaker
connection. There must be a separate insulated wire for
each speaker connection (+ and -).
4. Plug the speaker's wiring harness(es) into the equalizer/booster. Be
sure to connect front and rear speakers as marked.
5. Connect the larger red (power) wire with in-line fuse holder to the
ACC (Accessory Circuit) position of your automobile's ignition. This
connection allows the supply of +12 volt DC power source to be turned
on and off with the ignition key.
Speaker Tips
Your speakers should be capable of handling 40 watts per pair. RadioShack
auto sound speakers are normally sold and rated by pairs.
With a 4 speaker system, you can use 4- or 8-Ohm speakers. Set the 8-OHM-4
switch on the bottom of the equalizer/booster for the type of speakers you
have.
Connecting the Equalizer/Booster to Your Existing Auto Sound System (See
Faxback Doc. # 46863, Fig. B)