Recommendation for 3' USB cable from ultraRendu to Ayre DX-5 DSD

Monoprice!

Switched from a Audioquest carbon to a basic cable I had laying around and there was no descerable difference.    Still have the cheap cable in place.

Another vote for Monoprice and specifically their Monolith USB.
https://www.monoprice.com/product?p_id=33464

See the Monolith USB report by Duster on Audio Asylum.
https://www.audioasylum.com/audio/cables/messages/17/176921.html

I found it delivered better sound than a very fine Oyaide d+ neo Class A USB that itself was favorably reviewed by Karl Schuster for The Absolute Sound.
https://www.theabsolutesound.com/articles/oyaide-neo-d-class-a-usb-20-cable/

Don’t let the ridiculously low price for the Monolith USB dissuade you from trying it.

I highly recommend the DH Labs Mirage USB cable.  I purchased it for a second system I have, but found it's so good, I now use it on my main system, instead of my Nordost Heimdall USB cable, which is 3x the cost.  I've done an a/b and they're very close, but I give the Mirage the edge.  It opens up the music more.  I also purchased a AES/EBU cable from them with similar results.