phthora
Headphoneus Supremus
I agree with the BL and 560. A very nice match. Interestingly, I can, and do, run mine on ECO mode and it has plenty of power for my preferred listening levels (75 to 80 DB or so).
It also gains a few DB of SNR. Though this is highly unlikely to be audible, it makes me feel better.
You know, I tried Eco mode while I was prepping a response to peter123, and it wasn't bad. Didn't get a whole lot of volume, obviously, but it also sort of changed the sound towards being a bit more relaxed. I could see running them in Eco for non-critical listening.