INSTRUCTION SHEET
Part Number
Toll Free: 800.500.1500 • Worldwide: 217.540.4200 • www.mamotorworks.com • [email protected]
119-202
RetroSound
®
SUB-8100 Active Bass Subwoofer
(cont.)
Page
4
Problem
Possible Cause
Action to Solve Problem
Powered subwoofer will
not turn on
(no Power on LED indicator)
12 Volt Batt + wire not connected
or incorrect voltage/remote wire not
connected or incorrect voltage
Check all connections for proper voltage
with a volt meter. Voltage range:
12-15 volts.
Ground wire not connected
Check ground connection.
Fuse on Batt + is blown
Replace blown fuse.
No sound heard from unit but
LED power indicator is on
Volume turned all the way down
Increase head unit volume/check
volume level on head unit.
Gain control on sub amp is
turned down
Increase gain control on end panel of
sub amp.
Input signal not connected
Check low level inputs for proper
connection.
Unit blows fuses
Incorrect fuse rating
Use fuses with correct 10 amp rating.
Batt + wire is touching chassis ground
Check for pinched or shorted wire.
On-board subwoofer defective
Check/replace subwoofer.
Not +12 Volts/car battery not connected
Make sure the vehicle is + 12 volts and
that the car battery is correctly
connected to the vehicle.
Remote lead shorting
Check the Remote lead to make sure it
is not shorting out the amp.
Engine noise
Bad ground connection
Make sure the Sub-8100 unit is
grounded to clean bare metal of the
vehicle.
Signal ground loop or RFI interference
Re-route RCA cables from existing high
current wiring.
Distorted audio output
Incorrect input signal type
or input level is too high
Check connections and reduce/adjust
input level.
Poor bass response
Adjust phase control.
Check polarity of speaker wires if using
high level input.
Low audio Output
Incorrect input signal type or input level
too low
Check connections and increase/adjust
input level.
Weak bass response
Low frequency output is out of phase
Adjust phase control.
Check crossover adjustment.
Troubleshooting guide
