OTL amps

We are currently using Harbeth Compact HL7ES's and Jean-Marie Reynaud Twinn MKll's with the ZH-270. The David Berning ZH-270 works extremely well with dynamic speakers such as these and I am confident that it would also mate well with various other dynamic speakers with modest power requirments. There has been no indication that the David Berning OTL is limited in any way for exclusive use with an electrostat speaker. Our dynamic speakers match perfectly with this OTL in every aspect. This amp must simply be heard to appreciate. It has impressed me more than any single piece of gear I have heard, period.

Thorty40, Have you heard any other otl's?

Interesting thread. Although there are several references to OTL's being particularly suitable to esl's, how do they handle wide impedance swings... say, the 1.5 ohm to 32 ohm swings of my CLS's? Switching from ss to tubes was a huge improvement with my speakers -- are OTL's (like the 150w Atmasphere's) sympatico with my speakers' characteristics? I'm intrigued with the descriptions of OTL sound posted here.

Jim, How low does impedance drop in the low freq.?Say 500cycles down.In the CLS's.

Philefreak, no I have not had the opportunity to listen to any other OTL's. A friend of mine gave me a very strong recomendation for use of the David Berning ZH-270. He had used other OTL's before and said this one is one to have period. His strong opinion of this particular OTL stems almost exlusively from the amps excellent sonics and the ability to handle various impedance loads with high current (and runs cool!!). Often times other OTL's are limited for use with speakers with a flat impedance curve and relative sensitivity. This little monster is a high current musical animal with the most controlled, taught bass I have ever heard. The ability to control and convey dynamic passages within the music are unparalleled by no other amp I have used. Seriously, this ugly little 10 pound amp will knock you silly with dynamics and musical ability. For technology information check out the David Berning website. No other OTL uses this kind of advanced technology.