OTL amps on Dynamic Speakers

I am driving Audio Physic Avanti III's (89db, benign 4ohm load) with the Tenor 75w OTL's and it is the best sound I have ever had. My room is 15x25x11h. Hope this gives you some reference.

Another one to consider especially if you're on a budget is the Transcendent OTL. Dead silent, quick as any solid state I've ever heard and as Jtinn notes, quicker than transformer coupled tube amps. This amp also has excellent bass definition along with all the other attritubes of OTL designs which is that harmonic purity and clarity and second to none high frequency extension with air on top. You have to hear these amps produce a well recorded operatic soprano, say Renee Fleming or Kathleen Battle to really appreciate this. It is a beautiful thing. Another nice thing about this amp is it doesn't run as hot (300 watts at idle) as the single ended OTL's which can really heat up a room.

I am using this amp with the Merlin VSM-M which is an 8 ohm load and 89 db efficient. The Transcendent mono's will drive a 4 ohm load according to Bruce, the designer.

Thanks for the advice guys, the last time I owned Otls, Counterpoint Sa4s, I had Mlogans Sequel 2s and Stax F81s and never had a chance to see what they did on a coned speaker. I now have Duntech Black Knights and may see what an OTL can do on those

No one mentioned the Berning ZH270, a reliable otl tube amp.

A product called the Zero Autoformer can be really helpful item mating your OTL to your speaker. I have replaced my speaker cable with this product with truly great results. Check out this link at the Atma-Sphere Owner Group site http://www.condor-connection.org/asog/tweaks/ps/zero/index.html