Yeah, I agree. I own a DNA 225 and it's amazing. I read a lot about the DNA 500 and know about Steve's reputation and if this was a problem someone would have encountered it. But my technician is a really knowledgeable guy and he says the RCAs should have been grounded and it's a poor design so I'm in a quandary. For now I'm going to use XLR to RCA cables and use the XLR connections on the DNA. Hopefully that will solve the problem.
McCormack DNA 500 loud hum
So I just picked up a McCormack DNA 500 and the damn thing just hums loudly in one channel when coupled with my cyrus preamp. I took it in and the tech said it's because the rcas aren't grounded as they enter the same Jensen transformers as the balanced connection, this can result in really bad humming. He's going to ground them but I just can't believe that I can't run this amp stock with my cyrus preamp? That preamp shouldn't have any problems with this amp. Any one have detailed knowledge of these a,ps that can guide me or my technician?