Last night I got a chance to watch (or should I say "listen to") LOTR without having to worry about waking up the house since I was the only one home... Wow. Totally amazing. It seemed I kept turning my sub down but it only got louder! Until the mountain crumbling scene and I heard a scary noise from my 360L 16hz Tempest. It was a rapid noise, almost like a huge gear slipping... I thought maybe it was the wall, so I slid the sub outward, and replayed it. It is definitely the driver. I am powering it with a 100W/ch receiver, so there is probably no protection for below 16hz tones. Do you think I am hearing clipping, or is the sub bottoming? The SPLs were around 120db at the time .