On the subject of USB Cables I have tried all the following and even bought a number of them 1) Chord Electronics free USB cable, 2) Chord Sarum T, 3) Supra USB, 4) Tellurium Q top line USB cable, 5) Synergistic Research 2nd top of line USB, 6) Vertere Pulse HB USB, 7) Danacable Trustream, 8) Mad Scientist Black Magic USB, 9) Final Touch Audio Callisto
Bear in mind I am not connecting my USB cable to the Dave, I am connecting to the Blu MkII M Scaler which connects to my Dave via Dual Coaxial.
All USB cables affected my overall sound but the two I most favoured for my system were 8 & 9. I currently use 9 not because I would say it is particularly better than 8 (both are exceptional imo) but it is a better fit for the sound of my speakers which are a little bass light. The Black Magic adds a little upper bass and definitely adds presence which I like but do not need with my current speakers. The Callisto gives me more bass, thicker mids and sweeter top end and more importantly is just a little better at closing the gap to a linear frequency band in my system. The callisto has great 'weight' imo. The lower mids are well represented. This became more apparent to me as I improved my electrics with superior cables and fuses.
I have been on a 'no cost-barrier' crusade for the last 18 months to take my system to a higher level. I was confident my Dave and M Scaler had more to give and they did. This started with a new Power amp progressed with acoustic room treatment, new cables (digital, analogue and electrical), Grounding Block and even Synergistic research HFT's and ATM.
The thing about the latter 'passive' room treatments from SR is that they do not add, they subtract the room noise that is interfering with your linear frequency band and believe me it is interfering until you do something about it. The crap that is going on in our rooms when music is playing is horrendous. Eventually if you address this you are left with a true representation of the output of your system, so be careful what you wish for!
For instance I used to like my Danacable but when I paired everything down to the bare bones sound coming out of my speakers it became clear to me that there was a tiring high frequency prominence with this cable not unlike ringing. So the moral of the story here is that cables should be used to balance your system imo but the better you get it the more it will make you critical. A Green SR ATM placed between my speakers on the mantle shelf was the final piece of the jigsaw for me. As close to a perfect frequency/tone balance when using the Callisto USB on my system.
I think for me the overall goal is trying to achieve the most linear frequency balance when choosing cables for my system. When compromised, the dynamics do not deliver for the majority of my music collection and if the dynamics are then compromised on the linear frequency scale so in the drama and musicality for a big chunk of my library. There are some great cables out there and I will not be selling my Black Magic USB or Townshend Interconnects and speaker cables even though I don't currently use them. If I ever change my speakers I may need them. Its all about balance imo.