U.S. Amps MERLIN2 Owner's Manual - Weak Output
8
• Re-adjust the Input Level Control to better suit the input signal.
Weak output
• If the noise is a “whine” whose pitch follows the engine speed, confirm that
the amplifier and any other signal sources (head unit, equalizer, etc) are
properly grounded.
• 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 the ignition is in need of service.
• Check the routing of the speaker and input wires to make sure they are not
adjacent to wires which interconnect with lights and other accessories.
• If the above steps fail to improve or clear noise interference, the system
souled be checked by a authorized U.S.Amps Dealer.
Noise in the audio
• Confirm that all terminal 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 mid point.
• 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 is either in the head unit/other source or the connecting
cables.
Only one channel works
• Confirm that all terminal strip connections are secure and tight.
• Check both in-line and built-in fuses.
• Confirm that the audio signal source (car radio, 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) and briefly tap the center pin of each of the disconnected RCA plugs
with your finger. This should produce a noise (feedback) in your speakers.
No Output
Before removing your amplifier, refer to the list below and follow
the suggested procedures. Always test the speakers and their wires