Thanks for the info Naris. I disassembled the right side, and found some grit near the opening for the diaphragm, which I removed quite easily. They don't buzz anymore! cj

My HD-600's are buzzing in the right channel, on low bass notes. I'd like to open the right side to check whether it's merely some dirt to remove, or if the diaphragm is shot. Can anyone explain how to disassemble the unit without leaving marks or damage? Thanks! cj

Try here: http://www.audioimages.com/

Hi, Your work looks good and sensible. I'd make some PCB layout suggestions: On layers 2 and 3, your power layers, I would make the traces somewhat wider, while continuing to observe the careful order in which you lead your power loads back to the source supply connection. Treat power lead...