I had the 500 to start and it just couldn't fill my room by itself. The 600 was a huge improvement and it gets loud. I'll eventually have dual 600s down there if the wife doesn't kill me first.
LFR1100 VP180HP EP600 M3 In Ceiling x 4 M5OW M2 - Atmos rears ADA1500.5 M3 Outdoor Speakers ADA 1000.8