I heard a few people go from the 350 to the 500 and they say that the 350 is a good sub but the 500 is in a different league. I was wondering what more does the 600 provide compared to the 500? I love my 500 but if there is a noticeable difference between the two subs I would get the 600.
I know some of the guys here are now using multiple subs. I do not want to go that route. Any input about this subject would be greatly appreciated.

Thanks

M60's VP150 QS8's EP500 Denon3805