[quote=WiWavelength;19489100]Well, the Blue Diamond is a fully differential design. For five or seven channels, $2400 seems reasonable.
For those of us that are not electrical engineers, what does this full differential design do for me? I have a B&K AVR 307 receiver (150w x 7). I love its sound. The highs are open, airy, very detailed and never harsh, grainy, screechy, etc. The bass is powerfully strong and deep, but very tight/quick and controlled - not sloppy. You always get the feeling there is plenty of reserve power - never straining even at very loud levels. Low level detail is very good, and the amps are very quiet. I recently listen to an Anthem system. It could have been the set up, but it did not sound as open and airy to me. It also seemed to get more congested when there was a lot going on musically (I was using some of my classical-symphonic music discs). I am building a larger theater, so I'm looking to upgrade to separates with 200w or + per channel for the larger roomer. B&K is out of business, so that is why I'm looking here to find something with similar or better sound. Did B&K use a full differential design? All I know is that they used a "Class A pre-driver and Class AB Mosfet output stages" ( I don't have a clue what all that means, I just know that I liked the way it sounds). How would these Gemstones "sound" compared to the B&K ? Thanks for any helpful insights - PK