Manuel,
What a coincidence. I have never posted to a forum until now although I have been lurking here for many months. For Christmas I replaced my entire home theater with the 950/755 as the core. I kept my Klipsch 10" sub however. As movies became more dynamic in the bass, I had quite alarming pops with explosions and sudden loud noises. I had hoped that a new processor and dvd would solve this problem but it continued. It was clear to me that the bass cone or magnet was crashing into the cage with considerable force, in spite of reduced levels. I thought about a high pass filter to eliminate sub-sonic frequency or what I suspected was pure d.c voltage in a brief burst. My subwoofer cable is a Monster specialty cable that has an oddly configured splitter which plugs into both left and right subwoofer inputs. According to Monster this configuration increases bass impact and signal strength for more powerful bass. After removing this splitter I have yet to encounter a pop, even when replaying scenes which consistantly caused a problem. I figure that I was over-driving the sub with this cable. I like the sound better and I was possibly listening to some clipping all along. Hope this helps your situation some as I feel you would have better bass if you drove the sub with line level input instead of speaker level- especially for movies.