Wyred 4 Sound mAMP - Manual (Page 9)

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5. If the input selection switch is in the proper position, you will need to check your
source for sound output. Carefully check to see that you have the correct input
selected and the cables plugged in securely.
6. If the input is in the proper position and you are confident that your source is
sending a signal but have no sound, try inspecting or replacing the interconnects and
speaker cables.
7. Verify that the interconnects are working by replacing them with a different set
from a connection that you know works. If these cables were used in the current
setup and the only component that has changed is the mAMP continue to the next
step.
8. Now that you have interconnects that you know work, try connecting the
amplifier to another source and speakers that you know have worked in the past.
If you are still experiencing problems and have exhausted your available resources
and time please contact the dealer/distributor that you purchased the product from
for additional support.
Got hum?
Is there too much hum coming out of your speakers? To clarify, if you put
your ear right next to the tweeter of your speaker, it is normal to hear some level
hiss. If the noise is easily heard at a distance, try putting your source on mute. If this
eliminates the noise, it’s inherent in the source. If muting your source doesn’t
disconnect the outputs when muted, and the noise still exists while muted, try
disconnecting the inputs to the amplifier. If the noise is still there when the inputs
are disconnected, then your amplifier may need service. If the noise is not there
when the inputs are disconnected, try putting a cheater plug (ground isolator) on
one component at a time in order to locate the source of the ground loop. Once the
source is located you can contact the manufacturer for further information
regarding a solution. NOTE: We only recommend using a ground isolator for trouble
shooting purposes, and it should be removed after the problem has been found and
resolved. Having the ground of any unit disconnected can potentially create a
dangerous situation.
An easy way to locate a noisy component is to replicate the problem then
start disconnecting components one at a time, starting with the source end of your
system. Digital cable boxes and satellite receivers are notorious for making ground
loop hum. This is normally caused by the potential difference on the input wire
(shield side) for either of the boxes when referenced to ground. If this is the case in
your system, the installation of an isolating transformer would be the easiest
solution and are normally readily available at your local electronics parts store. A