Tony has give lots of good information. You might want to check out the article "Optimizing ASC Tube Traps" at http://www.tubetrap.com/articles/iar89.htm - Dan
Do TubeTraps require symmetry?
In an ideal world we'd all have dedicated listening rooms. Alas, I'd like to add some TubeTraps/Bass absorbers to my listening room, but due to room configuration, can only place them on one side of the room (front and back). Will this still work or will it effect the bass from only one speaker. I'm thinking that it will be OK because thhey eliminate standing waves/room resonances rather than directly absorbing incident low frequencies. Any thoughts?