Sonic Defender
Headphoneus Supremus
I'm not too sure about that. My initial measurements indicate to me that damping factor w/ the Elise is going to have an effect on the way the headphones sound. I measured a 3 dB bass boost in the lower frequencies and significantly increased 2nd harmonic distortion when I plugged my 32-ohm TH900 into the 40-ohm OTL amp. The former may be "preference" but the latter is definitely not a good thing. I don't think it's a great idea to bank on pairing the 64 ohm Z1R with the Elise. I've always felt OTL's should be paired with higher impedance headphones due to the effects of damping ratio and my recent experience does support this.
I agree, I used the Z1R with my OTL La Figaro 339, and the Z1R gets warmer. Yes things become more lush, and for some that may actually be what they want, but for me I do feel that using my solid state NAD M3 is the better pairing for my tastes. I felt it made the Z1R sound less detailed and slower. Now I had changed my power tubes to some Mullard 6080s changing from Chatham 2399s, but I'm not sure tube choice can account for this.