The last time I checked, Spotify did not use 320kbps on iOS devices at all. I stayed with MOG for that reason.Spotify is still 'in the process' of converting their music to 320k. Most is still in 160k, although it does sound pretty good.
It should be mentioned that the DAC they are discussing in your link is the uDAC and uDAC-2. I have the uDAC and got it specifically for using with the iPAD on trips. The other reason I got one is that it takes the USB output (via camera connector) and will send the signal out in coax. This gives it the ability to use the iPad with a DAC that lacks USB inputs (like the old Bereford DAC I was using at the time).Mac DAC's are good and even outperform some (one) standalone DAC's! Irrefutable:
http://www.head-fi.org/t/569015/2011...tter-than-udac
However, the uDAC and uDAC2 are not in the same league as any desktop/nonportable DAC I have used. In fact, its measurements are not good at all:
http://nwavguy.blogspot.com/2011/02/nuforce-udac-2-drama.html
I am not surprised that the iMac sounds better.
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