Is usb reclocking necessary?

usb reclocking or cleansing (there are various devices by innous, w4s, ifi) often helps computer streamed digital outputs

Interesting question. I have a QB9 Twenty as well. I am feeding it with an Aurender N100. Since the QB9 must depacketize and time the bits I wouldn’t think of that as an option, so I wouldn’t think it would. But absolutely every time I have thought something would not matter it has. Since there is a product to do it, someone thought so. I bet it does. Well, if you get it, let is know.

I find it is very helpful & useful, so much so that I daisy-chained two reclockers and enjoy much better clarity and dynamics.

I had a DAC over 10 years ago that did not have a synchronous usb input.  The DAC was great with S/PDIF, but with usb the soundstage completely collapsed.  On Orchestral recordings it sounded as if the bass drum and the tuba were side by side with the Conductor.  I then bought one of those cheap reclocker devices by Musical Fidelity.  It came in ugly casework, had no independent power source, and stopped working after a week.  During that week, however, it made the usb almost equal to the other inputs.
  Todays DACs come with some type of reclocker.  The question then becomes how much additional sonic benefit can be derived from an additional reclocker.  Surely the numbers would would better on a graph, but any audible improvement?  I noted with interest that with dCS, more than one respected reviewer thought there was no audible benefit to the separate reclocker, which cost around $10K