Hi there, Monty -

I'm a happy new 7500 owner, too. Just like you, I'm driving Polk LSi15s in front, LSif/x in the rear, and a DSW pro 400 sub. Yesterday was the first time I have actually pushed the system to any degree what so ever, and what I heard brought a smile to my face that still hasn't gone away. So far, it's everything I hoped it would be, and I know I still have some tweaking to do.

Good luck to you.