<font color='#000000'>I also had a buzzing sound with my D1S. I'm in process of upgrading whole system, but am very curious why the buzzing occurred. Mine was in all channels; the only un-orthodox thing I had done was to use a PC uninterrupted power supply for hooking up a VCR (got tired of flashing lights during frequent power outages when I was trying to record a series every day). I do have inwall speaker wiring, which hopefully was not laid next to elect. wiring. I had a lot of equipment connected to the receiver, including;
laserdisc/CD player
2 VCR's
cassette tape
turntable
interconnects to another receiver (late 70's vintage quad with a turntable connected to it)
equalizer
FM ant
Unfortunately, I had the UPS powering the one VCR for so long, I can't remember if it buzzed with out it. I just read on where computer PC UPS's are very noisy so it could have been the source. Also, my media room and home office with PC's is all on one circuit.
What's your layout? I would like to see if any common points, since I'll be putting the D1S up for sale soon.
Thanks</font>