Interesting response, thanks. Do you think it would be worth my time to try to isolate the back concrete walls, to maybe dampen the brightness? I also wonder why there seems to be a lack of full sound. The B&W DM602s are heralded as excellent speakers, and the Marantz should be able to give them enough juice, with 90 watts and a pretty hefty transformer inside. But, I'm just starting out in audio, and have a lot to learn ;\)