Would I benefit from biamping?

SORRY!! That is a KAV-250a. A little brain fart.

In some cases yes but in this case - save your money.

I while back there was a long thread about this very subject. I have saved a link to a web-site (http://www.sound.au.com/bi-amp.htm) that you should read to give you some very good ideas about bi-amping. It talks about the various "options" you have and what their individual benefits are. I personally think it's a great article.

Bi-amping almost always helps; especially actively bi-amping.
That said, in my opinion, you should first upgrade your amp. I would sell you KAV and purchase a Krell FPB. I guarantee the improvement will blow you away!

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.