Definitely not a power issue. The fact that someone had to upgrade to the XPR is hilarious. You didn't mention what you have your speakers set to (large or small). If you have them set to small what crossover setting?
I have a similar setup with the 690, an XT32 capable receiver running as a pre/pro with an XPA-5 amp. I've watched both those movies and they both sounded awesome. They both also sounded awesome when I had my Marantz AV-7005 with MultEQ XT.