Hi lex,
Your room can easily accommodate an EP600; it could host multiple EP600. There is a big difference between the EP500 and the EP600; far greater than the price difference might suggest.
Before I had my dedicated home theatre, one day I was listening to a short organ recording sent to me by an Axiom customer who was saying experimenting loud and bad distortion on his small EP125 subwoofer. I played it on both my EP500 and then on the EP600. On the EP500 you could ear something was not right very deep sound but not menacing. I repeated the same passage on the EP600 it sent my mother-in-law in panic mode; the dishes started shifting upstairs in the kitchen.
When I first audition the EP600; my initial comment to Ian was that it sounded like two EP500.
