Free-Hanging Limp Mass: Bass Trap or Bass Myth?

Free-Hanging Limp Mass: Bass Trap or Bass Myth? The worst bass trap isn't the one that does nothing. It's the one that makes you think it's working. Every few years, this same design pops back up in forums and magazine articles. The idea: hang a heavy sheet of mass loaded vinyl a few inches off the wall, maybe stuff some insulation behind it, and let the vinyl vibrate with the sound to absorb bass. The whole thing can be as shallow as six inches. For anyone tight on space (so... most of us),...