Coming to the thread a bit late, but to address your original question I have owned both the SPL Auditor and the M1HPA and used them both with Tesla T1 headphones.   My preference was definitely for the Musical Fidelity amp.  The Auditor is a fine piece of equipment, but it just didn't sound...

Are Stax valve amplifiers self-biasing, or is occasional adjustment required? (and when replacing valves).  If so, is it an easy procedure - I've had valve speaker amps in the past that were tedious to bias.

Quote:   Thanks for posting the photo - that makes it very clear. It's actually easier than I'd imagined - and easy to remove, so worth the experiment regardless.   Is this mod particularly recommended when the amp is used with SR-007 headphones?  Most of the posts I've read have been...

Quote: Many thanks - you got mail  

Scanning through the posts here I've come across mention of a recommended mod to the SRM-727 amp.  I believe it is a change in 4 resistors, so I guess they are near the output and would be altering the bass rolloff.   Anyway, I can't find a specific post with instructions or description...

Quote:   What?

I've just placed an order with PriceJapan for the SR-507 headphones, so now I have to wait impatiently .  I'm still uncertain about the amp, but there is a hi-fi club in Sydney so I'll go along to their next meeting and see if any of the guys (funny how audio is such a guy thing, isn't it?) also...

Quote: One of the thing that most impressed me with Stax is how relaxed and effortless the music is, regardless of scale or whether it is intimate jazz or powerful rock.  A friend and I went over to the shop to have another listen two days after I first heard them (he was not familiar...

Quote: Nuance is nice, but finances rule   Thanks for the comments - I had a good feeling about the 507 + 323 combo - good to hear a second opinion.  I think so far that it is my preferred solution.  It also has the bonus that as both the cans and amp are under $1k I don't have to...

  Quote:   Duly noted - I have a recently acquired Unison Research Unico Secondo hybrid amp for the speakers, which has a second set of dedicated speaker outputs for bi-amping, so an energiser is not out of the question.  My main reason for preferring an amp for the headphones is...

I've been lurking here for a while, and have read the last 200 pages of postings in this forum, but I'd like some recent opinions on a couple of pieces of gear.   After using a number of different dynamic headphones (I'm familiar with Alessandro MS-Pro, AKG 701, Sennheiser HD-650, Audez'e...