Boss Audio Systems B12ES, User Manual

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Problem Solution
No sound Check that audio input connection is correctly and securely made.
If using low-level input connection, check the RCA cables are correctly and
securely plugged.
If using high-level input connection, check connection with the speaker wires
of your head unit.
Low output Adjust the remote subwoofer control to increase sound level.
Input gain level is too low. Reset the input level control.
Check the frequency pass filter setting.
Distorted audio Check that the input gain control is set to match the output level of your
source unit. Always try to set the input gain level as low as possible.
Check for short circuits on the speaker wires.
Check if the amplifier of your source unit is defective.
Audio noise Keep the power cables away from the RCA cables.
Keep the RCA cables away from other electrical cables in the vehicle.
Check that the black ground wire from the high level input wire harness is
properly connected to the metal frame of the vehicle when using high-level
input connection.
Poor quality RCA cables can pick up radiated noise. Use only the best
quality RCA cables.
Check that a negative speaker wire is not touching the vehicle chassis.
Check that your source unit is properly grounded.
Check if noise originates in your source unit.
Subwoofer getting very hot Check that the minimum speaker impedance for the subwoofer is correct.
Check that there is good air circulation around the subwofoer. In some
applications, it may be necessary to add an external cooling fan.