Optimus 120-2154 - Manual (Page 5)

it is mounted.
Be sure to avoid obstructions behind the mounting surface.
Routing Speaker Wires
If you install speakers, avoid routing the speaker wires near moving parts
or sharp edges. You can usually route them 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 Phillips screwdriver to remove the
shipping screw from the top of the stereo.
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. However, your
local RadioShack store will provide warranty service if you
cut a wire and find the product is defective.
You might need additional wire, depending on your individual
autosound system, to complete the connections. Your local
RadioShack store carries a full line of wire and wire
management accessories.
CAUTIONS: For added safety and to protect your stereo, disconnect the
cable from your vehicle battery's negative (-) terminal before
you begin.
Be sure your speakers can handle 64 Watts of power (16 Watts
per channel). Each speaker must have an impedance of at least