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I just compared the sound of the NFB-10SE using its USB input vs. using coax from the MHDT USBridge (which is async with twin oscillators). I listened to 44.1KHz as well as 96KHz music.
I used ATH-W3000ANV headphones which are extremely detailed.
Differences, if any, are very subtle. I managed to convince myself that the USBridge is very slightly better, but it may be purely psychological. I don't think I would be able to tell the difference in a blind test.
Sounds like you are having a better result than Sid-Fi, earlier in the thread (post below). Maybe the SE has better implementation than the 10WM ? (would seem unlikely though)
I went with the Audiophilleo2 and it really improved things for me with NFB-10WM. I think I was hearing a lot of the usb issues such as jitter, dirty usb power, etc., and was clearly not hearing the NFB10s potential using its stock USB (which is still pretty good for a stock implementation). The Audiophilleo2 doesn't have a separate power supply but has galvanic isolation and power filtering mechanisms built-in. To me it has been a very nice upgrade, but the DI is very respected as well. Just my 2 cents.