Power Input Connectors; Front And Rear Inputs And Outputs (Rca) - Infinity REF-704a Owner's Manual

5. Power Input Connectors:

• Power: Run power wire from the +12V input to the positive terminal of the vehicle's battery. Install an appropriate fuse holder and fuse
(60A minimum on REF-704a and REF-551a, 105A minimum on REF-4555a) within 18" (457mm) of the battery. Make sure the wire is not
damaged or pinched during installation. Install protective grommets when routing wires through the bulkhead or other sheet metal. Use
larger-gauge wiring for longer runs.
° REF-704a minimum wire size: 10 gauge
° REF-4555a, REF-551a minimum wire size: 8 gauge
• Ground: Run a wire (the same gauge as the power wire) from the GND input to a factory bolt in the vehicle's chassis (see illustration
below). NOTE: Remove any paint from the chassis for best contact. Use a star washer below the ring connector for a secure connection.
• Remote: Connect a 20-gauge wire from the "Remote Out" lead of the source unit to the REM input. This lead turns the amplifier on when
using low-level input signals.

6. Front and rear inputs and outputs (RCA):

• If your source unit offers preamp outputs, connect to the FRONT, REAR, and/or SUB inputs using RCA patch cables.
• To connect a second amp directly to the REF-704a amplifier, run a patch cable from the PRE OUT outputs to the second amp's preamp inputs.
If your car audio system's head unit does not have line-level outputs:
Use the supplied bare wire-to-RCA adapters to connect the REF amplifier's inputs to either the front or the rear speaker outputs of your car audio
system's head unit (splice crimps not included).
Important: Some factory-installed audio system amplifiers include electronic filters that limit the amount of bass sent to the system's smaller
speakers. This filtering will adversely affect the REF amp's performance. To get the most bass possible from your REF amp, splice the bare wire-to-
RCA adapters into the factory system speaker outputs that are connected to the system's largest speakers (the ones designed to make the most bass).
Use a small phillips screwdriver to losen the adapter's set screws and insert the speaker wires into the holes on the back of the adapter. Tighten
the set screws to secure the wires.
Loosen
Screws
7
Factory Bolt
Ring Connector
Factory Bolt Ring Connector
Note: Remove any paint
Note: Remove any paint
below ring connector
below ring connector
Insert
Wires
Ground Wire
Ground Wi re
Star Washer
Star Washer
Tighten
Screws