Wyred 4 Sound STI Series User Manual
Page 7
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WYRED 4 SOUND STI Integrated amplifier v2.2
4235 Traffic Way
Atascadero, CA 93422
PH: 805-466-9973
FAX: 805-462-8962
©2013 WYRED 4 SOUND
All rights reserved.
Page 7 of 12
4. If you can hear the amplifier turn on and off, but there still isn’t any sound, make sure you are getting a
signal to it.
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. Verifiy 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.
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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
trouble shooting 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.
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When the amplifier faults, there will be no indication other than the lack of music. The STI 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
.