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Pretty much matches the impressions of a few of my non-audiophile friends and me. To my ears, something sounded off about the SR009, even after spending weeks with it and using them to listen to everything from lossless to YouTube. The SR009s kind of remind me of when a video game has too much bloom and everything ends up looking sort of strange.
It just doesn't sound as musical to me as the MK2 or MK1 (never heard the MK2.5). One of my friends who is sensitive to loud and trebly sounds found them near-unlistenable. The only two devices I've heard that have tamed the SR009 enough for me are the LL (granted, LL heard under meet conditions with unfamiliar music) and the Realiser.
I haven't spent much time with the MK1, but from what I've heard, it's a very nice headphone and will probably be my next electrostat. I haven't done an A/B test, but it didn't sound as dark or bassy as the MK2. The MK2 can easily sound muddy and congested without a quality signal chain, and is probably the most unforgiving headphone I've ever encountered.
The more I read 009-impressions along these lines, the more I'm convinced the 009s are voiced to the Stax amps, like my 007t/ii that works so well with them. I also use a Shunyata Anaconda VX power cord on my CDP for an additional smidgen of warmth.
(My EMM cdp is neutral and honest, not a warm player like, say, Playback Designs or maybe Meridians).
When I was waiting for the 009s, I talked to Yei at Stax USA, and I mentioned the reports of tipped-up sound compared to the SR007s I used to have, when I mentioned that I had my 007t/ii amp he immediately said w/o hesitation I would have no problem,
and he knew what he was talking about.
I heard the 009s with another amp and did hear some shout and trebly sounds as noted. And I *hate* that in phones. The Stax amp cures that for me. I would advise anyone getting the 009s to start with a Stax amp (I liked the tubed one)
and get to know them and then later experiment with others if they felt the need to do so. The Stax amps command good prices used (and are pretty rare on the market) so there would not be a loss if you sold later, and they only cost about $2400 new.
Look in the forums, you will not see much criticism of the 009s with Stax amps from owners. Yeah, maybe you can achieve greater results with the bigger amps, but I really believe you will not be annoyed by the Stax amp
and will hear the sweet direct detail and overall goodness of the 009s right away.
I had planned to use the 007t/ii amp as a stepping stone to the better amps, and after a few months of glorious sound with the 009s, I feel zero need to upgrade.