Mike, You're biased ; ) The DK may be a good amp and it may be equal to or better than the MA6900, I've never heard it, but it's hard to compete against the legacy of Mcintosh if you're drawn to Mcintosh in the first place. The Dk may draw people in for its sound quality especially for its price, but the Mcintosh will draw people in for sound quality and many others reasons too incuding its extensive feature list and styling.
