5. Verify that the input selector is selecting the proper input for what you have connected.
6. If the input is in the proper position and still no sound, then try replacing the interconnects to verify the connection
between the amplifier and source.
7. Verify that the interconnects are conducting by replacing them on a different set from a connection that you know
works.
8. Now that you have interconnects that you know work, try connecting the amplifier to another source that you
know has worked in the past.
If you are still experiencing problems after checking all possibilities and using the resources provided please contact
your dealer or Wyred 4 Sound directly for further assistance.
Got Hum?
Is there too much hum or hiss coming out of your speakers? If you put your ear right next to the tweeter of your
speaker, you should barely be able to hear any hiss from the amplifier in normal conditions. If the noise is easily
heard at a distance, try putting your source on mute, or pause. If this eliminates the noise, it’s inherent in the source
or preamplifier. If 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, and the inputs
are shorted with shorting plugs, then your amplifier may need some servicing. If the noise is not there when the
inputs are disconnected, try putting a cheater plug (ground isolator) on one or all components in order to eliminate a
ground loop issue. NOTE: We only recommend using a ground isolator for troubleshooting purposes, and should be
removed after the problem has been found. 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 a source. 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 better solution is a power
strip with grounded and surge protected F-connectors that you can pass a signal through.
Amplifier Faults
When the amplifier faults, there will be no indication other than the lack of music. The STI-v2 series amplifiers are
very robust and can handle the heaviest of loads. Under normal circumstances, there shouldn’t be any issues with
faulting. If you suspect a problem, check the outputs and speaker connections to make sure they aren’t shorted to
each other or ground. If the amplifier faults while playing music loud, you may need a bigger amplifier for your taste
or system. Contact your dealer or Wyred 4 Sound for other options you can explore.
© Wyred 4 Sound. All rights reserved.
STI-v2 Manual v1
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