Bass Traps


Has anyone built their own bass traps? If so what did use for the frame work and what type of insulation did you use?

128x128samgar2
Google Jon Risch bass traps. He shows his design in detail.
He can also be found over at audio asylum. He has been very helpful  over at audio asylum.
 I built two 20” traps per his design 10 years ago. Still using them.
Supposed to be similar to RPG traps.
joe