The amp in question is the Earle Weston Topaz http://www.westonaco...m/service2.html i think that link should work
Some strangeness in the specs... Class A & 35 w to start (unless B+ is quite high), says it is running ultralinear with no global feedback so likely has a fairly high output imprdance. Means you want a smooth flattish output impedance, otherwise the speakers frequency response will be multiplied by a factor of the impedance curve. With single drivers a rise at the top and the bottom coupled with a high output impedance can be beneficial as you get a boost where it is often needed. It also has to be said... that is a lot of power for a speaker this efficient.
If i was choosing a speaker within your mandate i'd be looking at Vulcan
, you'd have to build or find someone to build it for you. Of course i'd use my version of the FE206
If it wasn't for the efficiency requirement, Rasmussen's Elsinores or his new flat impedance speaker would be a good candidate (the latter limited by the Visaton B200's 89ish dB efficiency.
Edited by planet10, 25 October 2011 - 04:35 PM.