14
Substitute a different, known working source
controls to prevent overdriving the speakers before
Test the speakers with a different, distortion free
the distortion remains, then the speakers are likely
the replacement speakers, please review the chapter
entitled, ‘Protecting Speakers From Becoming
Disconnect the Speaker Block Connector, loosen
the screws, remove the speaker wires and substitute
have distortion, then the problem is in the wiring
If the connections on the Speaker Block Connector
are correct, both channels of the RCA cable are
working and distortion free, the source into the amp
is not distorted but the local test speaker is distorted,
Potential Reasons
• The introduction of a satellite receiver or cable box
into the audio system can cause a ground loop,
• The speaker or the speaker wires are in very close
proximity to the transformer in the low voltage
•
Steps to Resolve
Temporarily reduce the audio system to a bare
connected to an audio system with an AV receiver,
cable box and/or satellite receiver, then turn off the
With all the line-level inputs disconnected, is the
hum still audible through the speakers? If yes and
not physically grounded to the rack, then the hum
Connect a mobile audio device using its headphone
output with a ‘stereo mini to two RCA male adaptor
streamer, or another audio source with a two prong
gone, then the problem is likely caused by a system
is with a ground loop isolator with RCA inputs and
If the hum is still present, consider temporarily
ground solves the problem, consider using an AC
hum eliminator/lifter on the component introducing
If any of the in-ceiling speakers are close to the low
voltage lighting transformers, then the speakers will
need to be moved, the transformers moved away
from the speakers or at least the crossovers on the
Potential Reasons
•
• Poorly shielded or defective line-level RCA cables
• Damaged speaker voice coils and/or suspension
components (torn spider and/or woofer surround)
• Drywall debris, insulation or other extraneous
material has fallen into the speaker and resting
• An improperly terminated two wire speaker
connection in which strands from one wire are in
•
Steps to Resolve
Connect a different, low noise audio source into
disappears, then the source has the noise and not
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