Resurrecting my own thread here, as I now have had a chance to try out both cabs with my V4BRI. Bass used is a P with flats, Aguilar 60's style pickups.
Hate to say it but I'm not digging the 212av as much as I thought I would. Generally with Ampeg stuff I can plug-in and with minimal tweaking work out a tone that I like. This has been the case for me with flip-tops, classic series cabs, SVTS, V4s, etc. - even some of the solid state combos. To my ears the two cabs are sounding like this:
410HE: solid low end, linear response as you climb up the freq spectrum, warm yet punchy, balanced, supportive
212AV: somewhat thin low end, shouty/forward mids, less linear, less cohesive or balanced, extra lows can be dialed in via eq, but they don't seem to integrate with the overall tone, just kind of sit below it
I'm having a bit of difficulty hearing the magic in the 212AV as compared to the 410HE and really missing the 810 comparisons. I've been using the 410 for years so perhaps it's just what I'm used to...
I do need more time with the 212. I suppose the mid-forward vibes can help cut through the mix and folks seem to dig that. In my recent rehearsals I felt the cab was getting too loud and shouty before it was getting enough low-end to really fill and support, and I'm definitely not a hifi, super-low, sub bass kind of player at all...
One note - one of the drivers in the 212 was recently replaced and has little to no time on it, the other is original and has lots of time on it. Could be minor differences but without getting into the speaker break-in argument I don't foresee any possible minor changes being drastic enough to address my concerns...