Dynamic speakers for OTL amps

Audiokinesis showed a 2-way speaker at RMAF last year call the Stratoprism that may well suit the bill. It was moderately priced and very easy to drive- with that kind of power and the efficiency of the Stratoprism you would have no worries in a room of that size. The speaker was very fast, detailed, cohesive, relaxed, imaged very well and had a nice extended bottom octave with plenty of impact.

For a bit more outlay Classic Audio Loudspeakers makes two models, the T-3 and T-1 that are both very easy to drive and have excellent bass extension.

Also easy to drive are the Wilsons, with the possible exception of the Sasha, which IME is not power hungry but may present impedance issues, which is solved by using a set of ZEROs (although the setup I heard was sans ZEROs, others have felt that the Sashas did benefit from them). The WP series doesn't need any such assistance.

Any of the ZUs will be effortless with a 140 watt OTL! Most 'full range' single-driver speakers will be as well any horn system.

Merlins are very popular with OTLs and are easy enough to drive with that kind of power that you should do well.

Quad ESL63s would not do badly in a room that size either.

There are many others as well, but the larger room is the consideration here.

Thanks a lot, and yes, I hope I am in for a treat! Obviously there are many variables, and doing away with x-overs may not be realistic in practice. The advice concerning a smooth impedance curve and bass excess/voicing is relevant, as are the models suggested by Atmasphere. Ideally I would try them all, since system/room matching is quite unpredictable. Realistically I will start using two Aurum Cantus 8 ohm monitors (with or without a DD18 sub), and work my way from there. I probably won't be able to resist connecting the OTLs to my big Dynaudio Consequences, although I can say beforehand that it won't be optimal. But - you never know, in this hobby, which is part of the fun.

Not all tube OTL amp have the same impedance requirement of speaker

?? Sorry- can't make sense of the last comment.

Much has happened since this thread in 2011 - but briefly, for me, this is the situation. I followed my OTL interest, buying Atma-sphere MA-1s and then upgrading to v 3.2, and invested in Audiokinesis Dream Maker speakers, and lately also LCS effect speakers. I have not looked back. Beautiful music, no listener strain.