Bravo to Kal, for a very informative review of the Squeezebox Touch (not to mention JA's great illustrative measurements). I particularly applaud Kal's experimentation with, and reporting, about John Swenson's (unofficial) USB output "tweak" which I was not particularly familiar with. However, I'm wondering if it was perhaps just the Ayre DX-5 DAC itself that elevated the performance of the pair, and wonder if similar tweaks could be implemented for Toslink or S/PDIF output as well (which is how I'm feeding my Benchmark DAC). Regardless, looks like the "sky is the limit" with this latest Squeezebox iteration!
Hopefully Logitech will incorporate some of the proven software "tweaks" into future firmware upgrades.
Regardless, I think the growing "buzz" about the Touch will definitely catch the attention of even the most digitally-jaded audiophiles!