I just got these used in great condition with the pt-1 pads already on them. I haven't tried the stock pads yet.
All I can say is WOW!
Before today, I was certifiably bonkers for my onkyo a800, even going as far as to call it a fractionally-priced Focal Clear. So of course the first thing I did with the SR1 was A/B it to the a800. I had high hopes for the SR1 given everything written ITT, but I was 60% sure the a800 would win or it would be a tie. I was 90% sure it would be a close contest either way. Wrong on both counts - the SR1 ran away with it! My preference for the SR1 was most noticeable whenever the SR1 got the first listen of a song. With most songs, listening on the a800 after the SR1 had me sorely missing the SR1's sound. In fact with some songs the a800 seemed Grado-like next to the SR1. I didn't know it before today, but the a800 will probably benefit from EQ.
I don't even think this is a case of NTS. If I retract the above, I'll attribute it to my ears not being in the mood for the a800 this morning.
So far I only tried the SR1 unamped, given its easy specs. But someone ITT said the right amp transforms it, so I'll try my amps next time. I suppose I should try the stock pads too, even though just about everyone prefers the pt-1.
Thanks everyone for steering me to the SR1
Especially
@Roderick - first the Sash and now this, you sir are my personal headphone guru lol.