Tube traps

Where did you find the DIY projects?

Here's a link for DIY tube traps:
http://www.geocities.com/jonrisch/a.htm

Here's the link to his main page:
http://www.geocities.com/jonrisch/

the Jon Risch site is very good for these. However, you do need to make a bunch of them. When room modes are excited a few placed in the corners will not make a very big difference. I often hear people tell me--these traps don't work. Well, they do, but room modes are compounded by the surface area of wall(s) and thus need a large portion of the wall covered to relieve the pressure that is causing the problem.

For problematic rooms like mine ( highly reverberant) commercial tube traps work extremely well. I doubt that any other treatment would work as well. The traps need to go from floor to ceiling, and all of the corners and first reflection points need to be treated. Also, any extended reflective surfaces.
Its not a sightly solution, but highly effective.
One problem with many tube traps in a room is that they will eventually tip the frequency balance, typically leaning out the midrange.