My experience is that the calibration did improve the quality of the 3D head tracking based processing. Before calibration to my head, it was a little bit like looking through a slight wavy glass window. There were hot spots based on where I was looking. After, the response was noticably...

When can we expect the software to be available to all of us new Mobius owners?

Fun fact: the first person to call the other bud in an argument automatically loses. Sign of weakness. Should the QC also test distortion? Presumably yes. How much is too much though? Is 0.1% THD ok? 0.001%? 0.00000001%? How should QC know? Depends what was deemed acceptable at the time of...

QCs job in any manufacturing operation is to determine whether or not the end product meets spec. It has no responsibility to determine whether or not the spec is valid. That's engineering's job.... Let's manufacture some more incorrect assumptions to be upset about!

Bluetooth is incapable of carrying 7.1 audio. This limitation is independent of Mobius. Stereo only.

To be fair, there is no evidence that the turned around shipments are Audeze request at this point. So much speculation.

FWIW i didnt notice much difference in output tube rolling. To each his own. I've only tried the bugle boys and the ecc85 was a touch less warm and a touch more detailed.

I found mine on ebay from argentina. Took a few weeks to arive in the US, so that was a downside. I'll give sysfail a couple hours if he wants them, else I'd be happy to send them your way for a fair price.

I've got a perfect set of tubes for you for fixing exactly your observations: Siemens ECC85   I've posted my thoughts on this tube elsewhere in this thread.   When I had my HD800 I thought the stock set up was dry sounding. The ECC85 has much better low end than stock and a generally warmer...

It's machined 6061 aluminum for the clamping blocks and aluminum flat sock for the headband.

They are G-Cush pads with hand stitched covers :)

  I guess there's not much Grado left about these. Turbulent X drivers and custom everything else. Twas a fun project.

E188CC are fine (7308 are the same thing). None of the rest in your list are pin compatible, though some could potentially be used with tube adapters in some cases.    The thing will also work w/ 7v heater tubes like PCC88/7dj8.   Also never heard of e6b7.

Well, ideal is really up to you.   I think the nominal height for the SR series headphones is 35mm.   My cups are 52mm. It's really up to you.

I just made myself some wood cups.   The outer dimension of the cup where the headband attaches is 55mm.   The driver diameter is 46mm.   L-cush pads are 80mm in diameter and 20mm thick.