I just got a H/K 525 receiver to hook into my Aperion 5.1 speaker set. But after doing that, the sound left much to be desired. Also with the 12" sub, it doesn't sound very loud with explosions, but it sounds super load with the base from music in a movie (such as all the rap music in The Fast and the Furious in DTS). And music from normal CD's seems to be missing the high base sound that helps with the "thump". What sort of things can I do to help setup my H/K receiver to sound better with these speakers? What should I set the crossover frequency for on the sub and speakers in the H/K setup?