A dual woofer OB design would never work with Inspire amps....
Untitled by
Analog Addict, on Flickr
Untitled by
Analog Addict, on Flickr
Untitled by
Analog Addict, on Flickr
Dennis actually set these up as a true dual woofer design with the woofers running in parallel. The extra driver adds approx 3db spl. The quality of the Altec woofers is ahem...better than the drivers we were using, and they still sounded fantastic with any Inspire amp. Given that the sensitivity of the Altec woofers is probably 6-8 db better than the ones we used, I think even a 45 SET amp should work extremely well in this application