As Emil says, Soliloquy uses Analysis Plus religiously at their factory(I've been there) and at all shows. Their interconnects can be kinda pricey though, so I've been using DH Labs BL1 that allows all the detail the 5.3s are capable of producing to come through. FYI, Soliloquy also strongly recommends bi-wiring the speakers so you should keep that in mind when choosing a speaker cable. Again, I found the DH Labs Q14 worked well and will save you some $$$ vs. Analysis Plus if that's a consideration. Best of luck.
Tim
Tim