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76
Installation Operation/Troubleshooting
1. Plan the wire routing. Keep RCA cables close together but isolated
from the amplifier’s power cables and any high power auto accessories,
especially electric motors. This is done to prevent coupling the noise
from radiated electrical fields into the audio signal. When feeding
the wires through the firewall or any metal barrier, protect them with
plastic or rubber grommets to prevent short circuits. Leave the wires
long at this point to adjust for a precise fit at a later time.
2. Prepare the RED wire (power cable) for attachment to the amplifier by
stripping 1/2” of insulation from the end of the wire. Insert the bared
wire into the B+ terminal of the power connector and tighten the set
screw to secure the cable in place.
NOTE: The B+ cable MUST be fused 18” or less from the vehicle’s battery.
Install the fuseholder under the hood and ensure connections are water
tight.
3. Trim the RED wire (power cable) within 18” of the battery and splice in
a inline fuse holder (not supplied). See Specifications for the rating of
the fuse to be used. DO NOT install the fuse at this time.
4. Strip 1/2” from the battery end of the power cable and crimp an
appropriate size ring terminal to the cable. Use the ring terminal to
connect to the battery positive terminal.
5. Prepare the BLACK wire (Ground cable) for attachment to the amplifier
by stripping 1/2” of insulation from the end of the wire. Insert the bare
wire into the GROUND terminal of the power connector and tighten
the set screw to secure the cable in place. Prepare the chassis ground
by scraping any paint from the metal surface and thoroughly clean the
area of all dirt and grease. Strip the other end of the wire and attach a
ring connector. Fasten the cable to the chassis using a non-anodized
screw and a star washer.
NOTE: Keep the length of the BLACK wire (Ground) as short as possible.
Always less than 30”.
6. Prepare the Remote turn-on wire for attachment to the amplifier by
stripping 1/2” of insulation from the end of the wire. Insert the bared
wire into the REMOTE terminal of the power connector and tighten
the set screw to secure the wire in place. Connect the other end of
the Remote wire to a switched 12 volt positive source. The switched
voltage is usually taken from the source unit’s remote amp on lead. If
the source unit does not have this output available, the recommended
solution is to wire a mechanical switch in line with a 12 volt source to
activate the amplifier.
NOTE: In the event that a switched +12V is not available, either DC offset
or Audio sense can be selected for amplifier turn-on.
7. Connect the power connector to the mating connector at the amplifier.
8. Connect from source signal by plugging the RCA cables into the RCA/
Speaker Harness input jacks, then insert the four pin Molex connector
into the mating four pin INPUT connector at the amplifier.
NOTE: When the installation requires a High Level(Speaker) input, the
RCA/Speaker Harness will need to be cut on the speaker wire side of the y-
splitter.Then connect the white to the left(+), white/black to the left(-), grey
to the right(+), and grey/black to the right(-) corresponding vehicle wires.
Always ensure power is off or disconnected at
the amplifier before connecting RCA cables.
Failure to do so may cause damage to the am-
plifier and/or connected components.
9. Perform a final check of the completed system wiring to ensure that all
connections are accurate. Check all power and ground connections
for frayed wires and loose connections which could cause problems.
Install inline fuse near battery connection.
Troubleshooting
NOTE: If you are having problems after installation follow the Trouble-
shooting procedures below.
Step 1. Check Amplifier for proper connections. Verify that POWER light
is on. If POWER light is on skip to Step 3, if not continue.
• Check in-line fuse on battery positive cable. Replace if necessary.
• Check fuse(s) on amplifier. Replace if necessary.
• Verify that Ground connection is connected to clean metal on the
vehicle’s chassis. Repair/replace if necessary.
• Verify there is 9 to 14.4 Volts present at the positive battery and remote
turn-on cable. Verify quality connections for both cables at amplifier,
stereo, and battery/fuseholder. Repair/replace if necessary.
Step 2. Protect light is on.
• If the Protect light is on, this is a sign of a possible short in the speaker
connections. Check for proper speaker connections and use a volt/ohm
meter to check for possible shorts in the speaker wiring. Too low of a
speaker impedance may also cause Protect to light.
Step 3. Check Amplifier for audio output.
• Verify good RCA input connections at stereo and amplifier. Check
entire length of cables for kinks, splices, etc. Test RCA inputs for AC
volts with stereo on. Repair/replace if necessary.
• Disconnect RCA input from amplifier. Connect RCA input from test
stereo directly to amplifier input.
Step 4. Check Amplifier if you experience Turn-on Pop.
• Disconnect input signal to amplifier and turn amplifier on and off.
• If the noise is eliminated, connect the REMOTE lead of amplifier to
source unit with a delay turn-on module.
OR
• Use a different 12 Volt source for REMOTE lead of amplifier.
Step 5. Check Amplifier if you experience excess Engine Noise.
• Route all signal carrying wires (RCA, Speaker cables) away from power
and ground wires.
OR
• Bypass any and all electrical components between the stereo and the
amplifier(s). Connect stereo directly to input of amplifier. If noise goes
away the unit being bypassed is the cause of the noise.
OR
• Remove existing ground wires for all electrical components. Reground
wires to different locations. Verify that grounding location is clean,
shiny metal free of paint, rust etc.
OR
• Add secondary ground cable from negative battery terminal to the
chassis metal or engine block of vehicle.
OR
• Have alternator and battery load tested by your mechanic. Verify good
working order of vehicle electrical system including distributor, spark
plugs, spark plug wires, voltage regulator etc.
Adjusting Level
1. Turn amplifier level to minimum (counter-clockwise).
2. Turn the source unit volume up to 7/8 maximum (or when distortion
is just inaudible).
3. Slowly increase amplifier gain control until adequate volume is
achieved.
NOTE: Best signal to noise and dynamic range are realized with gain set to
minimum. For a more in depth setting procedure, contact Rockford Tech-
nical Support.
Avoid setting amplifier level high as noise and
distortion will greatly increase.
Adjusting Crossover Frequency
The crossover frequency can be adjusted between 50-120Hz.The cross-
over is set to LP (Low Pass) only. Turn the crossover adjustment knob
all the way down. With the system playing, turn the crossover adjustment
knob up slowly until the desired crossover point is achieved.
Phase Switch
Allows you to conveniently switch the output phase of the amplifier be-
tween 0° and 180°. This has the same effect as physically reversing the
Positive (+) and Negative (-) speaker wires
Input Level
Set the Input Level switch to match the outputs of your source unit.(LO -
RCA or HI - Speaker Level)
Auto Turn On(illus.-3.1)
Three different automatic turn-on modes can be selected; REM(+12V), DC
Offset, and Audio.
Remote: Set the switch to REM to use the remote turn-on lead from your
source unit.
DC Offset: Set the switch to DC Offset to detect a DC offset from the HI-
Level speaker outputs when the source unit has been turned on.
Audio: Set the switch to Audio to detect the incoming audio signal from
your source unit and automatically turn on your powered loaded enclo-
sure.
NOTE: Using either the DC Offset or Audio mode causes the REM on the
power connector to have +12V out for turning on additional amplifiers.
Punch EQ
This works along with the crossover switch on the amplifier. When set to
Low-Pass (LP) operation, this is a variable Bass Boost. Set this to your
personal preference while listening to the system.
Over excursion and subsequent damage may
occur at high levels of boost.
Remote Punch Level Control
When connected, the “Level Control” is linked and allows you to remotely
control the output level of the amplifier from the dash or center console.
illus.-3.1
Cut
illus.-4.1
LOW INPUT
HI-LEVEL
INPUT
AUTO TURN ON NOTES
Requires 4mV signal
Needs 6V DC on
factory speaker wires
Use hi-level or low-
level input
REM
AUTO TURN ON
REM - DC - AUDIO
AUTO TURN ON
REM - DC - AUDIO
AUTO TURN ON
REM - DC - AUDIO
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