By accident I learned today that the Gaia DDC is not "bullet proof" regarding USB filtering.
I feed it with an original Auralic Aries (femto), 2015 device, via USB. That streamer has been running in WiFi mode since I got it last year, b/c first quick comparisons showed no audible difference at that time.
In the meantime, the chain got a little better, my local dealer and also Vinshine got happier, thanks to my orders.
The streamer stayed, and it stayed in WiFi mode.
Yesterday I connected it - just for fun - again with a long&cheap cable run directly into my internet router, and switched off WiFi.
To my surprise, the difference in SQ was immediately there - less congested, more punch. More attack. Unbelievable!
... and this, although the DAC (Venus II) gets its input from the Gaia.
Only conclusion so far: When switching on the WiFi on my Auralic streamer, its USB output gets worse - jitter, noise, probably a little of both.
Even the Gaia can not completely mitigate this effect.
Fun fact: Today I borrowed an Audioquest JitterBug FMJ from my local dealer - guess what: it still improves SQ a little (Auralic->Jitterbug->USB->Gaia->i2s->Venus.
Luckily, cost is reasonable.
YMMV