Well, since initially I was the '1st responder' to this thread, I feel obligated to add my .02...
I once owned the Summits (a GREAT speaker) but needed some cash for other home projects - so went down a step to the Vantages. I have owned these now for about 6 mos. and can honestly say I don't feel like I am giving up ANYTHING to the Summits. The Vantages are fabulous speakers. From the mids on up, I really don't think there is much of a discernable difference between the two - with one possible caveat. If you are in a huge room (say bigger than 20'x 30') the Summits WILL play a bit louder, with more ease. But considering that the Summits are TWICE the price, the law of diminishing returns really rears it's head pretty quickly here. There obviously isn't any where near a 50% improvement in sound.
Regarding panel size - yes, I think prior to the new 'X-Stat' models, the larger you went, the better they tended to sound, but the newer panels are MUCH more efficient, play louder, and as advertised, actually have a larger radiating area per sq. inch than the older, larger panels. I speak from some experience as I have owned Sequel II's, Aerius I's, ReQuests, Odysseys, Prodigys, Summits and now the Vantages. In fact, I actually feel that the narrower panel images better, with less 'venetian blind' effect and freq. changes with-slight-head-movements that used to occur with the larger panels.
Getting back to the Summits vs. Vantage - as an added bonus, the Vantages actually 'gel' better in the bass (in MY room) than the Summits did. Despite more controls on the bass units on the Summits, I could never completely eliminate a bass hump in the 80 hz-ish range, no matter what I tried. The Vantages might not go ultimately as deep, but they are faster and cleaner, again, in my room - go figure.
I once owned the Summits (a GREAT speaker) but needed some cash for other home projects - so went down a step to the Vantages. I have owned these now for about 6 mos. and can honestly say I don't feel like I am giving up ANYTHING to the Summits. The Vantages are fabulous speakers. From the mids on up, I really don't think there is much of a discernable difference between the two - with one possible caveat. If you are in a huge room (say bigger than 20'x 30') the Summits WILL play a bit louder, with more ease. But considering that the Summits are TWICE the price, the law of diminishing returns really rears it's head pretty quickly here. There obviously isn't any where near a 50% improvement in sound.
Regarding panel size - yes, I think prior to the new 'X-Stat' models, the larger you went, the better they tended to sound, but the newer panels are MUCH more efficient, play louder, and as advertised, actually have a larger radiating area per sq. inch than the older, larger panels. I speak from some experience as I have owned Sequel II's, Aerius I's, ReQuests, Odysseys, Prodigys, Summits and now the Vantages. In fact, I actually feel that the narrower panel images better, with less 'venetian blind' effect and freq. changes with-slight-head-movements that used to occur with the larger panels.
Getting back to the Summits vs. Vantage - as an added bonus, the Vantages actually 'gel' better in the bass (in MY room) than the Summits did. Despite more controls on the bass units on the Summits, I could never completely eliminate a bass hump in the 80 hz-ish range, no matter what I tried. The Vantages might not go ultimately as deep, but they are faster and cleaner, again, in my room - go figure.