LOL.. I know Darin!  I was looking over this thread before I bought the 950's (again) a couple of weeks ago.. I would've bought them from you if I had noticed you were selling them (at a damn good price, too!) earlier.  I'll always opt to support a fellow pirate, when possible.  This is one of those phones that I can't seem to stay away from.. for whatever reason.  The reason I bought it again was b/c I thought I maybe didn't give it enough time the first time I owned it.  Plus, I'm kind of bored with full sized dynamics (aside from the HD800), atm.

Regarding the Stax adapter, yep.. I'll most likely be ordering one from you when I get ready to make the jump... which might be sooner than later.  I've had my eye on the 252S instead of the 323.  I'm not looking to drop megabucks on a Stax amp for the 950.. so the 252S or 323 seem to be my best options.  Combing over the 950 thread at HF, I get the sense the 323 offers a noticeable, but incremental improvement over the 252S.  Those who've heard both over there opted for the 323 b/c it offered slightly more power if someone wanted to move to a Stax phone.. not necessarily b/c it was leagues ahead of the 252S.  It seems if I wanted to stick with the 950 and not move to a Stax phone (I don't have interest in Stax), the 252S is the most cost effective option.  What do you think?  I like the compact size of the 252S, too.  If anyone else has thoughts on a reasonably priced Stax amp to pair with the 950, I'm all ears.

Darin, I'd appreciate your thoughts on how the 323 compares to the stock energizer (I think such a comparison will offer me an approximate idea of how the 252S might compare.. which would be really helpful) and look forward to hearing how the Mouser PS works with the E90.

Regarding the Stax adapter, yep.. I'll most likely be ordering one from you when I get ready to make the jump... which might be sooner than later.  I've had my eye on the 252S instead of the 323.  I'm not looking to drop megabucks on a Stax amp for the 950.. so the 252S or 323 seem to be my best options.  Combing over the 950 thread at HF, I get the sense the 323 offers a noticeable, but incremental improvement over the 252S.  Those who've heard both over there opted for the 323 b/c it offered slightly more power if someone wanted to move to a Stax phone.. not necessarily b/c it was leagues ahead of the 252S.  It seems if I wanted to stick with the 950 and not move to a Stax phone (I don't have interest in Stax), the 252S is the most cost effective option.  What do you think?  I like the compact size of the 252S, too.  If anyone else has thoughts on a reasonably priced Stax amp to pair with the 950, I'm all ears.

Darin, I'd appreciate your thoughts on how the 323 compares to the stock energizer (I think such a comparison will offer me an approximate idea of how the 252S might compare.. which would be really helpful) and look forward to hearing how the Mouser PS works with the E90.

I do have a friend who has the Stax 252 amp, but I have never tried the ESP-950's with it.

I can't try the 323 amp right now since I sold all my stax adapter cables. I have the parts. I just need to build more. Once I do, I can give you more feedback.
But from memory, the difference was no subtle throughout the range. More bass, more impact, better highs, less veiled, less dark, etc.

Maybe that's why I have been selling a lot of the Stax cables. (until Ebay screwed me and suspended my account because someone else used my name and address to create a different fraudulent account.)

Thanks, ship.. now.. where to get a (NA voltage-compatible) 252S at a good price?!

Headamp looks to be a good place..

I use my 950's from a 252 at my desk at work all the time.  Great little combo. I'd always pick it ahead of the E90.  The compact size is a huge bonus.  For the price you can't go wrong with it.

OK . I was turning around the Koss ESP950 for month and I've pulled the trigger an hour ago. Amazon.ca offers a good deal and a friend of mine in Canada will receive the Koss and send it to me in France.

First question : I'll need to purchase a 220V European PSU. Any 9V standard PSU will work or should I look for something special ?

Sooner or later ( sooner the better) I'll probably look for a Stax amp ..  the question is SRM252 or SRM323 ?  @Shipsupt : did you compare you 252 to more pricey stax amps ?

I'm really excited to put my hands of this headphone. 

Yes, anything that outputs 9V will work.

If you can get your hands on the SRM323A, I suspect that would be an upgrade. Not sure how the adapters work.

I've a universal 9v/0.5A. This would be OK?

What is interesting for me in Stax amps is the parallel outputs. Useful to put the headphone amp between the DAC and the speaker amp. Better sound is welcome too.