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Try re-running your wires and seperating the wires or routing things differently.
When sound signals flow down the speaker wire, it creates a small magnetic field around the wire. Any other wire nearby can pick this up.
My guess is the wires for your two rear speakers run in parallel for a long distance with your center speaker wire. When dialog comes out of the center speaker - the rear speakers pick some of it up.
It could also be your electronics. Sometimes the channels develop cross-talk inside the box. To try and decide if it is the electronics or the wires/speakers do this:
- Create a situation where the L Front speaker produces a lot of interference. Turn off the reciever.
- Switch the wires for left/right front speakers.
- Turn on the reciever and listen for interference.
If the interference is still on the left speaker - you have a wire or speaker problem.
If the interference has moved to the right speaker - the problem is inside the electronics.
Hope this helps.
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