Once again, you guys are the best. I did a significant system upgrade, largely based on info from this forum. It sounds AMAZING!!! But, first loud Bing Bang Boom movie, (Lord of the Rings @ -10dB), I heard a couple loud POPS from front speakers. Stopped immediately, turned down the volume a bit, and it didn't happen again. Volume back up, another POP during particularly big boom sequence.
Searched this forum and found this thread. Checked my own stuff based on info in the thread. Audyssey set crossover for Aperion Grand Towers at 40Hz. Aperion specs say freq response starts at 47Hz, so I changed my crossover to 60Hz. Called Aperion and the guy recommended setting crossover at 80Hz... so I changed it to 80. Will try the rest of the movie like that and see if POPs go away.
BTW, system is: Denon AVR-X4000, Emotiva XPA-5 Amp, Rythmik FV15HP Subwoofer, 4x Grand Towers and Grand Center, KEF rear surrounds and KEF Sub #2. Learned about Denon/Emotiva/Rythmik/Aperion from this forum and Audioholics site. I gotta say, you guys put together quite a nice system for me, and continue to school me about how to use it and answer various questions. Thanks!!!