I haven't heard the EP500 yet, but it should be here in about 3 weeks. I've read its nothing short of amazing and I don't expect to be disappointed in any way (especially in my current small room ). I've had some trouble with my EP350's stand-by circuit, so long story short, I'm upgrading and removing the mute circuit in the EP500 before it leaves the factory. I'll get to see first hand the difference between these two subs, and hopefully I'll hear (and feel) the $600 price difference.

____________________________ M22 VP100 QS8 EP500 Yamaha HTR-5960