So the Lyr 3 isn’t much more than a switch box with a volume control, because I’m using the tape outs on my power amp. I’m using an ASR Emitter II Exclusive power amp and its a bit of a mismatch to run a signal from the ASR into the Schiit but the sound signature from my power amp is very noticeable and there’s nothing objectionable to the overall sound.
The Lyr is much more than a switchbox / volume in this scenario - it’s what’s driving and interacting with the headphones. The ASR is acting as an extra line stage here.
My only headphones were built by my Quad ESL technician. He was able to acquire the drivers that’s used in a well received pair of dynamic headphones (the name escapes me)
Sennheisers (usally higher impedance)? Grados? Grados are quite often modded, because the stock housings are not very good. I get more listening fatigue with Grados than any other brand, and it’s not very close (their ancient HP1000 series HP-1, 2, 3, headphones were easier on the ears). I was and am a big fan of Sennheiser's classic HD580 / 600 / 650 series. But not their HD800 / HD820 series :(
Empyreans are very dark and thick sounding headphones. It would not be my first guess for an electrostat lover - we have Stax for that! Be sure to try a few different brands / flavors to try and get a sense of where you tilt :)