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Just to clarify. 2x4 HD can work internally at 48 or 96kHz. It will accept input of sampling rates between 20-216 kHz, so 192kHz files will play. They will undergo DSP at whatever internal rate you set it to.
If you want to use USB out I'd suggest into looking at something like a Schiit Eitr.
I use UPS quite a bit, the drivers seem "professional" compared to some others i have encountered, and i liked that they kept their old trucks going. I am sure i have seen one around here on a W plate. I have not had any problems so far, but I do pack things conservatively.
The differences in the speed of sound you are discussing are just too small to be significant, a room mode peak will be centered on a particular frequency but will have a masking effect either side of that frequency, you can see this instantly if you use a microphone and software.
The filter you apply will have a ‘q’ a width if you like, you apply a filter, re measure and compare to the original response, if needs be you adjust the amount of negative gain and ‘Q’ until you obtain the result you require, confirm at each stage with listening.
As has been mentioned there will be far greater inaccuracies introduced by not using a microphone, than by the minuscule differences introduced by temperature and humidity.
Regarding digital sources, state of the art performance can be obtained relatively inexpensively , check out the dac measurements on the Audio Science Review forum.
I went to my dealer yesterday to have a look at the Selekt.. They were just setting up a demo for a customer so didn't get to hear it, but they have the basic with Kat, the integrated non-Kat and another one (can't remember which!).
Anyway, it looked nice. Squarer than I imagined. I'm not too impressed with the remote though. It looks plasticy in black.
While I was there I mentioned the possibility of the Integrated Exakt version as implied by the firmware. According to him, who asked the same question of a Linn engineer recently, there are no plans for such a thing. He was even told by said engineer than they can't fit the exakt engine in the chassis.
So it is all a bit peculiar.