D.I.Y. Bass Traps- calling acoustic techs....

To deal with a 50 Hz bump you will need the trap to be VERY large in diameter. This is an absorbing kind of trap and to be effective needs to make it to the 1/4 wavelength, that is roughly 5.5 feet.

If you go to our resource page. you will find there is an article on bass traps by Ethan Winer which we supported. This is a good intro into types of traps and how they can be effectively used.

FWIW - large = minimum of 16 inch thickness for absorbers ...and probably all four corners treated extensively (floor to ceiling)

You could use resonators but they tend to ring - and in the end it may be better to have a hump and a better RT60 than no hump and a poor RT60.

The biggest problem in my room is a +5.5Hz bump at ~100Hz. To reduce it I'm going to try adding a set of the pipe wrap bass traps.

Jon Gale, who is usually credited with this DIY plan, wrote on one forum that there is a "supertrap" version. The biggest change is the addition of a second smaller fiberglass tube inside of the first one. While a little more complex to build they are supposed to be more efficient (more absorption in a smaller volume).

Can anyone offer details about the size of the second tube? Is there a specific ratio between diameters involved for optimum efficiency or tuning?