I have the sub in a sealed box, sized according to specs for a sealed enclosure (1 cu foot?). I am running it at 1000 x 1 @ 1 ohm. I recently switched head units and was adjusting the gain and noticed I was bottoming out at low freqs. I had my subsonic set to 0/off since setting this system up but decided to set it to 30/40hz to help prevent the bottoming out. Now the system sounds overall weaker. Is there anything else I can do to prevent bottoming out? Is it too much power? Any advice is appreciated.