This is weird. Speakers make noise, hum, buzz even when system is not turned on. It is plugged into power however. Happens randomly, sometimes nothing for days. Sometimes happens for an hour or so. Sometimes all day. WTF?
Try unplugging everything and then see if you are getting any noise through the speakers. I have a neighbor with a ham radio, and every so often I will pick up noise from that. If you are using unshielded cables, they may be acting as an antenna.
If you have XENON lights any where in your house, do not put them on the dim setting or at least not while you are listening to your equipment. Same thing for any dimmers that you may have in your home. My Krell FPB 300cx was humming and I traced it to the Xenon lights in the kitchen that were on dim. Undimmed the hum was nonexistent.
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