i would love to buy these but.....will they work with ???? PROAC D38's or Danny's Super-V's........that is the question of the day.... don't know enough about last post.
Love the Proac classics.
My understanding and experience of OTL/speaker interface is quite simple: Above the bass range of about 100 Hz, each impedance peak in the load reflects in a similar FR peak. My peak (20 Ohms IIRC) @ 2.2 kHz was indeed audible. The EQ circuit flattened both the impedance and FR peaks. Once the EQ circuit installed and flattened the peak (heard as a slight but constant edgy thumbprint) it was one of the best amp/interfaces ever. The EQ circuit wired in parallel, not series, anywhere between the amp and speaker posts. The circuit is a permanent part of my ASA clone Xo.
Publish the impedance graph (above about 100 Hz) for any speaker and you'll be looking at a reasonable facsimile of the FR with OTL. My understanding is that impedance and FR peaks below 100 Hz are far less problematic.
Again, it's apparently not so difficult for a speaker designer to flatten one peak above the bass range.
I suppose the worse the phase angle the more difficult to drive, same with any amp.
Interestingly, the above described EQ circuit also improved performance even with super high current pure class A SS such as Plinius SA-50 MkIII (though it was more audible with the OTL...BTW, even the "lowly" 30W OTL played with more authority than the 57 lb Plinius).
One of the great features about OTL is that speakers have rising peaks in the bass range at resonance. In some or all cases an OTL amp will play with more bass authority and even have a lower bass cutoff vs. SS! Plus musical bliss above the bass (on the right load). Pretty close to a free lunch, once peaks are addressed.
