Thanks. To what extent did the Brickwall and Isotek units improve the sound? I hear reports that the Blacknoise unit and balanced power conditioners yield jaw-dropping improvements over no conditioner. Frankly, my PS Audio condition only makes a noticeable improvement, not a really big one, which is why I'm looking around. How much of an improvement did you get, and in what areas--bass, midrange, treble, black background, etc. Thanks again for your replies.