Agreed, and this is what Violectric has to say on the subject of potentiometers:
Why is a good volume pot essential ?
A volume potentiometer is a mechanical control element, which can be obtained on the market at any low price. Meanwhile it is often replaced by electronic circuitry, exhibiting essential disadvantages concerning dynamic range, noise and distortion. Conductive-plastic resistive tracks, high-quality multitap wipers and separated chambers for the individual sections are highly desirable for sophisticated applications, and high quality is inevitable to ensure trouble-free operation for years. Since the market for really good pots is a small one, manufacturers like Noble or Panasonic don't offer these any more. A current sample of top of the line pots is the RK27 by ALPS, which is used inside HPA 100 and HPA V200.
Clearly, I wasnt expecting an ALPS pot in the ZO2, but a volume pot isnt a trivial addition.
So maybe I wasn't far off with my comments regarding that ZO2 sounds best to me (most dynamic and transparent) at the highest volume level on the ZO2 and adjusting your source as needed. At least that's what my ears tell me, I suppose this is partly the reason why ZO1 sounded (and ZO2) so great for its price as all low cost amps fails a bit on the volume adjustment side... don't want to name any but u can probably guess...
Edited by RPGWiZaRD - 11/9/11 at 5:39pm