Had these for a while,but just recently the right channel when it gets to a certain level it makes the popping rattle noise?i have been driving them with a AMC integrated rated for 45 watts @8ohms.these should be easy speakers to drive?do you think i underpowered them,especially with lord of the rings,and other movies?the music i listen to is not mellow but i have been watching more movies now than when i first got these.could this be the reason underpowered.I dont have a sub yet,slowly trying to put my little home theater together.please any response,suggestions,or thoughts? Thanks