Not this again.
Maybe to you the RC-64II timbre-matches the RF-82II mains after you, uh, "trim it down," but not to Klipsch nor many others. Changing the volume of the center channel speaker is not going to change its voicing. This is not a matter of opinion; it is a MATTER OF FACT.
The RC-64II and the RF-82II do not share common tweeter assemblies. The RC-62II and the RF-82II do share the same tweeter. It is this fact and not crossover specs, nor efficiency specs, nor woofer size, that in this case determines the best timbre-match. One might like the RC-64II better than the RC-62II. There's nothing wrong with that. But that does not mean that the RC-64II is better timbre-matched to the RF-82II than the RC-62II is.
This is easy. It really is! The RC-64II's voicing matches the RF-7II mains the best. The RC-62II's voicing matches all of the other Reference towers' voicing better than the RC-64II will. Just look at which sets of speakers' tweeters match one another. This ain't rocket science. And yes, I'm using voicing and timbre-matching interchangeably for the purposes of this discussion.
Again, DaJoJo might prefer
the RC-64II to the RC-62II for any number of reasons, and there's nothing wrong with that. Heck, I'm sure he's not the only one. But, again, just because he likes the RC-64II better does not mean it's a better timbre-match for the RF-82IIs. Maybe timbre-matching across the front soundstage isn't as important to him as some other quality the RC-64II possesses that the RC-62II doesn't. I can't say. But a seamless soundstage - one that you get through proper timbre-matching - is vitally important to me. Thus, when I had my RF-82IIs, I went with an RC-62II. Now that I have RF-7IIs, I've moved to an RC-64II. I wouldn't mix the two up. Ever.
ClawAndTalon (a professional custom installer who knows a thing or two) went through this exact same discussion with DaJoJo a few weeks ago and I thought we'd put it to bed back then. Evidently not.
Blackmamba, if you want an unbiased opinion, call Klipsch and ask them whether the RC-62II or the RC-64II is the better timbre-match for your mains. They will say that the RC-62II is better matched. Heck, they even recommend on their website that you pair the RC-62II and the RF-82II! I don't know how much more of a recommendation you need.