Wee bit confused and very underwhelmed - what do you folks advise, please... Keen to explore the world of 24bit/192kHz downloads (DLs), so today I took delivery of an M2Tech hiFace USB interface (£100, incl VAT & next-day deliv) and £70-worth of Atlas Opus coax' (because the Arcam rDAC will only output 192kHz via coax'). Connected the MBP, hiFace and Opus - ta v much to Keith at Purite Audio (M2Tech's UK distr') for his assistance/patience via phone - and applied appropriate settings to the Audio MIDI's setup. Started playing various samples (Linn, Reference Recordings etc) of 192kHz DLs and... umm... er... in short, I'm very disappointed: not hearing the levels of detail, separation or imaging that I was expecting, also noticing a hint of low-end bloat. [] Also tried some 96kHz DLs via hiFace/coax and heard more of the same. Then I disconnected the hiFace/coax and connected the rDAC via USB and listened to the 96kHz DLs again. Ta-dah! Heaps more detail, separation and imaging with tighter low-end bass. Even the 192kHz DLs sounded better via USB, which is limited to 96kHz. And the USB cable cost me a tenner at Maplins. [:S] So what's the explanation? Is is that the rDAC's "dCS asynchronous USB technology" is superior to coax'? Does the Atlas Opus need hours 'n' hours of run-in (I've already used Atlas's burn-in disc, twice)? Or..? As ever, any advice much appreciated. Ta. []