Rockford Fosgate PUNCH 45.2 - Manual (Page 5)

I
NSTALLATION
• For safety, disconnect the negative lead from the car battery prior to beginning the installation
Trunk Mounting
Mounting the amplifier vertically on a surface with the fin grooves running up and down will provide the best cooling for the amplifier.
Passenger Compartment Mounting
Mounting the amplifier in the passenger compartment will work as long as you provide a sufficient amount of air for the amplifier to cool
itself. If you are going to mount the amplifier under the seat of the vehicle, you must have at least 1” (2.54cm) of air gap around the
amplifier’s heatsink.
B+ Terminal
The B+ cable MUST be fused 18” (45cm) or less from the vehicle’s battery. Prepare the cable ends and install the fuseholder under the
hood. Connections should be water tight.
GND Terminal
Prepare a length of cable to be used for the ground connection. Prepare the chassis ground by scraping any paint from the metal surface
and thoroughly clean the area of all dirt and grease. Fasten the cable to the chassis using a screw.
REM Terminal
Connect the REM wire to a switched 12 volt positive source. The switched signal is usually taken from the source unit’s auto antenna or
the accessory lead. If the source unit does not have these outputs available, the recommended solution is to wire a mechanical switch in-
line with a 12 volt source to activate the amplifier.
Input Connectors
Follow the diagram and connect the appropriate signal cables to the input terminals of the amplifier. Be sure that the signal cables are
routed close together and away from any high current wires.
Speaker Output Terminals
Connect the speaker system to the amplifier by inserting the wires into the corresponding output terminals and tighten the set screws.
Follow the diagram for proper signal polarity. DO NOT chassis ground any of the speaker wires as unstable amplifier operation may
result. CAUTION: This amplifier is not recommended for impedance loads below 2
Ω
stereo and/or 4
Ω
bridged (mono).
Gain Control(s)
The amplifier is factory set for optimum dynamic range. The system levels may be adjusted by ear when using a source unit with higher or
lower output levels by using the following procedure.
1. Turn the gain control to minimum (counterclockwise)
2. Play a music track with high dynamic content and turn up the source unit to at least 3/4 volume
3. Slowly increase the gain and set it just below audible distortion or until reaching a comfortable hearing threshold (whichever occurs
first)
Symptom Diagnosis Remedy
T
R O U B L E S H O O T I N G
Amplifier does not turn on. B+ or REM not between 10.5 and 15.5 volts or
no voltage present
Amplifier is not properly grounded.
Voltage spike from source unit is entering
amplifier’s input
Noise is radiating into signal cables
Check the alternator, battery, fuse, and
wiring and repair as necessary
Check wiring and repair as necessary
Connect turn-on module to REM terminal if
pops are eliminated with no input signal to
amplifier
Re-route signal cables away from sources
of high current
Amplifier Noise
(Turn-On Pop)
Engine Noise
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