C hing,
I) what's the freq of your source files?
II) will u use USB out from iMac?
If so, 1 thing to note is MF m1 can only take in 16/44.1 freq via USB
I know teac can take in 24/96 or 24/192 via USB (not sure if 24/192 works on Mac system though...)
No idea on rein x's spec... Sorry
Hope this helps....