There is no direct effect on asynchronous USB delivered data, since no timing is involved (asynchronous), but there might be indirect effect by noise injected into DAC. This noise might come from ambient electrical noise induced in the cable or computer electrical noise injected into cable. In first case shortest cable is likely better while in the second case, when computer noise is injected, longer cable might act as a filter for very high frequencies. What works for one person may not work for another - best to try.
