I have to agree with @roberttdid on this. Not that you should necessarily replace your DAC if you like it, but that reclocking the USB isn't, by itself, going to make a difference if the DAC is using an asynchronous USB input with buffering. The DAC is not deriving any timing signal from the USB, so reclocking isn't going to do anything.
On the other hand, if you are using a good quality digital-to-digital converter and using an interface other than USB between that device and your DAC, then the quality of the timing will make a big difference, and it's quite possible that such a device could have a better (even much better) clock than the DAC that it is feeding.
It's also quite possible, as @roberttdid stated, that a digital-to-digital converter/reclocker could be reducing noise on the USB connection that is affecting the DAC's SQ. Whether using such a device for this purpose is a better investment than replacing the DAC with one that can better reject this noise directly is a decision that each listener will have to make for themselves.
I also believe that there are some spectacular sounding DACs that don't necessarily have the best USB implementations. USB technology has evolved much more significantly in the past five years or so than other aspects of DAC design. There are very likely some state-of-the-art DACs from five or ten years ago that will have less than optimal USB interfaces that could easily benefit from some external help for less than the cost of replacement with a more recent implementation with an updated USB implementation.
On the other hand, if you are using a good quality digital-to-digital converter and using an interface other than USB between that device and your DAC, then the quality of the timing will make a big difference, and it's quite possible that such a device could have a better (even much better) clock than the DAC that it is feeding.
It's also quite possible, as @roberttdid stated, that a digital-to-digital converter/reclocker could be reducing noise on the USB connection that is affecting the DAC's SQ. Whether using such a device for this purpose is a better investment than replacing the DAC with one that can better reject this noise directly is a decision that each listener will have to make for themselves.
I also believe that there are some spectacular sounding DACs that don't necessarily have the best USB implementations. USB technology has evolved much more significantly in the past five years or so than other aspects of DAC design. There are very likely some state-of-the-art DACs from five or ten years ago that will have less than optimal USB interfaces that could easily benefit from some external help for less than the cost of replacement with a more recent implementation with an updated USB implementation.