I have tried it both ways, connected to the the amp outputs and the RCA out from my preamp going to my S812. I do prefer the RCA out to sub, it just seems a bit more dynamic and deeper bass. It's a much easier hookup also, especially if you are using mono blocs amps. I had to make a extention cable when I rolled out my monos. Besides, I don't really want the sub to have the flavor of the main amp, I prefer it having the flavor closest to the source.
REL speakon connection to amp vs speakers
I will be connecting 2 T/9x's to my system (B&W 805 D4) driven by a NAD M33. I am wondering if there is any audible difference between connecting them to the amp or to the speakers directly and am guessing somebody here has tried it.
I only use the system for music and I listen relatively quietly, the "room" is 16 by 16 but open concept so the total space is 16 by 50.