Bi-amping Snell Speakers Anyone?

Might the difference in loudness be due to differences in the sensitivity of the driver(s) handling mids and highs vs that (those) handling low frequencies?

I will talk to Snell tomorrow and see what they say about bi amping and the possible difference in sensitivity of the drivers.

My experience is that passive biamping does produce an improvement, but it is not huge relative to the cost of buying another amp.

I've had similar experience. I've tried many amp combinations on 2 separate systems and found one case where biamping produced improvements over one amp material enough (to my ears) to keep it running in biamp mode. This is running vertical biamp configuration driving Von Schweikert VR4-III's. I also tried this with Totem Mani-2's. In both cases I asked the speaker mfg if I would be better off using biamping vs one larger amp I was trying to decide if I should buy a larger monoblock Eagle 11 vs using my Eagle 4 amps. Totem said one large monoblock would be best (which I confirmed). Albert Von Schweikert said vertical biamping would be better. The VR4's are 2 separate modules and he recommends passive biamping. I've tried many other amps and none have performed better than the Eagle 4s in vertical passive biamp.

It will be interesting and worthwhile to hear what Snell recommends . . . but I suspect you may have proven the point already.

OK so Snell says biampinng is fine but active crossovers require more expertise than I have. For now I will concentrate on room tweaks and gear tweaks since there are many known issues there. Back to the salt mine.