OK, I've fixed all the cold solder joints I can visually find. The clicking and snapping have stopped and all the channels work except for the center channel. If I listen close to the speaker I can hear white noise, but no audio. I can hear and feel the relay clicking on/off if I turn the center channel on/off. I've checked the speaker and wiring and all is fine. Are there any other common problems with the center channel that I should check? I do not have test equipment to check the signal path.

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