This thread is several years old, but I offer the following for what it's worth. I use a McCormack DNA 0.5 Deluxe Rev B with Vandersteen 1b's. They are well matched and sound great together, particularly in the highs, mids and upper to mid bass. This combination doesn't have a lot of very deep bass, but this appears to be attributable to the speakers rather than the amplifier. This is no surprise, since the 1b's are entry-level Vandersteens. I consider this an acceptable tradeoff given the high quality of the sound they produce in the range they cover. Higher model Vandersteens, starting with the Vandersteen 2, reportedly produce more deep bass.