Hi Mcne; can't answer you yet, but maybe in a couple of weeks. I've had the same questions you have, so I just decided to "do it". My McCormack DNA-2DXs are now at SMC for upgrading and matching for passive vertical bi-amping.
Both Vandersteen Audio and Steve McCormack recommend bi-amping. I should have the amps back next week and will probably post a short report here. Right now I'm jumpier than a cat in a dog pound, ie hoping they'll sound good-- no home auditioning here, I just made the decision and did it-- after lengthy discussion with Steve McCormack. Note: my main cost was in upgrading, not in matching. Good luck to both of us ;>) Cheers. Craig.
Both Vandersteen Audio and Steve McCormack recommend bi-amping. I should have the amps back next week and will probably post a short report here. Right now I'm jumpier than a cat in a dog pound, ie hoping they'll sound good-- no home auditioning here, I just made the decision and did it-- after lengthy discussion with Steve McCormack. Note: my main cost was in upgrading, not in matching. Good luck to both of us ;>) Cheers. Craig.