Optimus 120-2152 - Manual (Page 5)

Routing Speaker Wires
If you install speakers, avoid routing the speaker wires near moving parts
or sharp edges. You can usually route it along the wiring channel beneath
the vehicle's door facings by carefully removing the molding that holds
the carpet in place. After you route the speaker wires, replace the
molding.
Removing the Shipping Screw
The shipping screw helps protect the stereo's CD player from being damaged
during shipment.
Before you mount the stereo, use a small Phillips screwdriver to remove
the shipping screw from the top of the stereo.
Caution:
If you do not remove the shipping screw, you cannot remove the
supplied sleeve from the stereo and the CD player will not work.
Note:
Save the shipping screw in case you ever want to mail or ship the
stereo. You can secure it to the back of the stereo with a piece of
tape.
MAKING THE CONNECTIONS
The supplied harness with the 14-pin connector includes all the lead wires
you need to connect the stereo to ground, power, some optional components,
and speakers.
Important:
Do not cut these wires. If you cut any wire, you cannot obtain a
refund or exchange on this product. Radio Shack will provide warranty
service if you cut a wire and find the product is defective.
You might need additional wire, depending on your individual auto
sound system, to complete the connections.
Your local Radio Shack store carries a full line of wire and wire management
accessories.