I have a REL sub that only produces a bad feedback or flutter no mater what setting, input or combination of both I have it set on. I have literally set it up in a different room from the than the turntable so I don't think isolation is the problem. I am going from the TT to a Music fidelity phono stage to a Denon AVR 980 to a B&K amp. There are three ways to connect to the REL. .1/lef input, low level input (both go directly from the Denon as the 5.1 surround option) and a high level input that connects to the left and right channel on the B&K. I am thinking that the problem as to be in the Denon. Anyone know of an adjustment in the setting in the Denon that could make the REL work the Turntable?