Hi Rob, i have owned 6 pairs of Acoustat's in a 28 years period, Spectra 22s - 33s - 2+2s - and this is my third pair of 1+1s living in a small condo i decided that this would probably my last pair for this reason i decided on many many upgrades even in it's original condition these where very decent speakers for $600.00 but with a $2,400.00 face lift of course it's now a very different Acoustat with an all steel frame & base double contact area for the panels top and bottom heads soldered together very high end parts in the interfaces and more that i am not aware of you know those do it yourself guy's have their little secrets well even if i'm up at around 3k for my speakers they are TRULY a bargain i am extremely happy with what i have and i think that it's the most important thing.
PS: You can see photos of the making of my Acoustat's 1+1s here =
http://www.flickr.com/photos/mracoustat/page7/