I have had mh770s in my system for quite some time now with newer Threshold amps and larger Duntec speakers. It seems to be a nice combination, sound is warm, open and airy. These cables are endorsed by Spectral, and I have heard, though not certain on this, that use of any other cable could void the Spectral warrenty. I also have the mh750s on the front channels of a 5.1 system, but have never put them in the higher end 2-ch system (yet).
Regards Dave
Regards Dave