Rebulx, Axiom got back to me on the return process so I'm good to go there. Loaded up the 600 in my car this morning, it barely fit, and I'll be hooking it up with the m100s this weekend. The SVS sub lacked the accuracy I look for. Even though the 500 wasn't big enough to fill the space I could still tell a massive difference in sound.

LFR1100
VP180HP
EP600
M3 In Ceiling x 4
M5OW
M2 - Atmos rears
ADA1500.5
M3 Outdoor Speakers
ADA 1000.8