Hi Mark; I could write a couple of pages about the virtues of the McCormack DNA-2DX, the Rev. A, and a pair of Rev. A's by SMc, but they've pretty well been covered by the reviews posted by Mikec above.
These are seriously powerful, smooth, refined amplifiers. I just had a pair up-graded to Rev. A for bi-amping, and they really are fantastic amps-- 300 wpc 8 Ohms, 600 wpc 4 Ohms, and 1200 wpc 2 Ohms. A used DNA-2 should be available for around $2500., and Rev. A is $2500. Good Hunting. Craig.
These are seriously powerful, smooth, refined amplifiers. I just had a pair up-graded to Rev. A for bi-amping, and they really are fantastic amps-- 300 wpc 8 Ohms, 600 wpc 4 Ohms, and 1200 wpc 2 Ohms. A used DNA-2 should be available for around $2500., and Rev. A is $2500. Good Hunting. Craig.