North Creek B&W 801 crossovers? Tried them?

I see what you mean on the re-matching the new plate. You could do that..but remember you have 6 posts now instead of the 4. It may be a very tight fit.

I love the MR77. I also owned a MR71 several years back. My dad is a mac lover, and has his original bought new MR 71, C-28 and MC-2105 amp. I sent my 77 back to Mac this summer for a full alignment and new glass. It looks and sounds great.

Audio Classic guys are really good. I used to live not too far from them years back and visted on several occasions. They are a bit pricy for alignment and repair, but worth it for mods to the tuners. Now that Richard M. is with them...they can really make the 77 and 78 models sound good or better than when new. Richard does some addional upgrades that were not avail back then. As you may know..he was the original chief designer of those tuners at McIntosh.... Downside is the expense though :-)

Re: NC XOs. It didn't occur to me that there would be 6 posts on the new binding post plate instead of the stock 4. So, I gather that there are three pairs of wires--one for each driver--coming out of the external XO, and that each of these pairs of wires has to be connected to a respective set of binding posts? (Please pardon the "duh" factor here...)

Re: MR-77. I'm aware that the original designer of the tuner (Richard M) now works at AudioClassics. I decided in favor of all the available upgrades since he did a pretty good job the first time around!

Ubglub
The bottom plate with "sing" along with the music if left in-place. Anyone using the Xovers should also utilise good spikes. Be carfeful when handling them as the bottom plates aren't very sturdy.

Tab, thanks for the recommendation and warning about the bottom plates. I don't think I'd use the XOs if I couldn't have the bottom plates on while doing so, since I have the speakers mounted on Sound Anchor stands that fit over the plates.

Ubglub
I meant the bottom plates of the NC's. Mine was craked in half. They pack a lot of parts on a not-too-sturdy platform. I just remembered that I drilled the original BP plates to accept the NC versions with minimal fuss.