Sound Storm Laboratories D400.2 User Manual

   Before removing your amplifier, refer to the list below and follow the suggested procedures, Always test the speakers and 
   their wires first.

       

Confirm that all terminal strip connections are secure and tight.
Check both in-line and built-in fuses. Both the "+12v" and the "REMOTE" terminals must
have +12v  referenced  to chassis ground.

a noise (feedback) in your speakers.

Confirm that all speaker strip connections are secure and tight.

Check the "BALANCE" control on the head unit (or other source) to verify that it is set to
 its midpoint.

is either in the head unit / other source or the connecting cables.

Readjust the input Sensitivity control to better suit the input signal.

If the noise is a "whine" whose pitch follows the engine speed, confirm that the amplifier
and any other signal sources (head unit ,etc.) are properly grounded.

the ignitions is in need of service.

 
to wires which interconnect lights and other accessories.

checked by a professional mobile audio installer. 

Confirm that the audio signal source (car audio, equalizer, etc.) is connected and is 
supplying output signal. To check if the amplifier is supplying signal, unplug the RCA
cables from the signal source (but leave them plugged into the amp). Briefly tap the
center pin of each of the disconnected RCA plugs with your finger. This should produce

If you are using the Low Level RCA input, reverse the input plugs at the amplifier (switch
the R with the L). If the channel which is silent switches to the other side, the problem 

If the noise is a "clicking"or "popping"  noise whose rate follows the engine speed, this
usually means that the vehicle is equipped with resistor spark plugs and wires, or that

Check the routing of the speakers and input wires to make sure they are not adjacent 

If the above steps fail to improve or clear noise interference, the system should be

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