I have a rythmik FV15HP in an 18x14x8 foot room in a system with PSB Stratus Gold mains on Brytson 3bst amps. The sub blends fantastically with the Golds for movies and music and I haven;t even set it up properly yet. I've heard your speakers in a decent room and they're slightly less warm than mine, and slightly more detailed. Based on how the sub sounds in my system I'd expect you to get a perfect match. I replaced a Hsu vtf3mk2 and the difference was phenominal, I highly recommend the rythmik. I was a bit hesotant on getting the vented sub but it sounds fantastic with music, cleaner and slighlty punchier than running the Golds without the sub, and the golds are very capable down low.
Bryston 3B-ST 2ch on mains, Lexicon 512 5ch
PSB Stratus Gold mains, C6i center
Paradigm ADP-370 surrounds
cheap energy rear speakers