Thanks for the suggestions. In response to Avguygeorge, the speakers are on spikes on a tile floor. They indent just a bit into the tiling. The wall is about 12 inches from the back of the speakers and is made of cinder blocks. The left speaker is 6 inches from a heater/wall that faces outdoors. For some reason (who knows what's under the tile), neither of my neighbors above or below ever hears a thing, so that shouldn't be a problem. I think i will look into a fiberglass sheet that I can hide behind a tapestry. Thanks again
Tom
Tom