If your 5.3s are new, wait for at least 300 hours (preferably 500 hours) before you start evaluating cables for them. Soliloquy speakers are notorious for a long break-in period. (I know. I have 6.5s.)
In my experience, bi-wiring is definitely beneficial. I use Kimber Bi-focal XL. Also place them well out from the wall behind them - at least 4 feet.
In my experience, bi-wiring is definitely beneficial. I use Kimber Bi-focal XL. Also place them well out from the wall behind them - at least 4 feet.