does the dac in the portable desktop support 24/192 or is it the same as the portable micro 24/96? also would be interested in comments pertaining to upsampling with itunes. specifically do you think, or hear, there is an advantage to playing 16/44.1 music out the optical port set to say...

so if we have an amp, a driver, and a connecting cable..... and we use a wideband sound pressure meter to determine a level at which we drive the output device [driver]. and we measure the wattage and VAR's of the amp output at this level we can calculate the amplifiers power factor in this...

not that it's a big deal that i am impressed, but still. i upgraded from a bithead running the usb off my macbook pro to a portable micro amp w/dac, connected to my macbook via optical. the difference is not small for sure. wow this thing sounds great. now connecting it via an analog...