I find everything sensitive to everything. Power cords, line conditioning, AC sockets, using Mad Scientist black discus on AC plugs, dedicated lines, the feet you mount it on, removing the cover (what, you have not tried this?), eliminating or putting super fuse in it, etc. etc. etc. I use a tractor tire inner tube (with very little inflation) and on top of that I have a thick maple slab and then I use the Mad Scientist ceramic feet between the maple block and the component.....very nice combo. Everything matters.