Was at Purks last night and had the pleasure of an extended comparison between the two pr. of different R10s/SDS and the HEV90/HE90. Also have heard the L3000 with matching amp, and have heard it used with the SDS on several occasions. The bass on the one pr. of R10s is extremely strong. Not as much punch as the L3000, but very close. Over all better to my ears. Lots of detail and depth in the bass that the L3000 cant do.
The Orpheus was IMO opinion the best phone I have heard. A little dark in comparison to the R10s. Not quite the detail in both treble and midrange to the older R10, but nicer with both (mids and highs) of these than the new R10. The new R10 were the least refined of the three phones. I cant wait until Purks ES-1 gets here to compare the two amps with the HE90s.
As far as the R10 using Hirschs SDS-XLR. I would think the soundstage would be better than the SDS Purk has, but doubt it will equal the bass unless Hirsch has done serious mods to the voltage output. I sold the amp to Hirsch and dont remember it ever having the punch Purks amp has.
All the statements about these phones were in comparison to each other. I dont find the HE90 too dark or the newer R10 unrefined. Just in comparison to each other. I have not heard any phones as nice as any of these three.
The treble, soundstage, and midrange of the older R10 is beautiful. The same things on the newer R10 are almost as good. But the bass kills the older R10.
Purk is in a very nice place to be...........R10 or R10 with the maxed out Singlepower SDS or HE90 with the HEV90 and a Singlepower ES-1 on the way. Life must be tough.