Bass guitar feedback?!?!

[Nubus]

I went to a practice space a while back and setup long-ways in the room. Some notes were like super-loud and feeding back. Next practice I got lucky and put my amp short-ways in the room. Sounded fine. Do bass traps take care of that kind of thing?
I heard from an engineer that the house of blues has a bad standing wave problem.

[DreamwaveMusic]

bass traps will help...though if you know that a room is over-resonating certain frequencies you can use helmholtz devices to balance the room.

[Nubus]

I looked into Helmholz devices, but I wouldn't be able to do any serious construction in the practice space as it's rental. I'm thinking that a bass trap hanging from the ceiling might take care of it, but I need to find a good way of making them myself to save money.

[DreamwaveMusic]

anyone know which absorbtion coefficient is mostly used for low frequencies? you may be able to find some material that is similar, but there are manufactured bass traps that really arent that expensive. they will provide the best results in corners of rooms or near the walls

[Nubus]

The more I read about it, the more I'm starting to think that a bass trap can be a Helmholz device.

[DreamwaveMusic]

I was under the impression that the helholz was designed much more specifically for controlling a certain frequency, or a very narrow range. I think a bass trap has a much broader range.

[Nubus]

How about a small couch (or sofa, your choice)? Wouldn't that do some absorption of low end?

[DreamwaveMusic]

heh, yeah i guess it would... it will also absorb high frequencies..money, beer...

[Nubus]

That reminds me of the song by Men's Recovery Project "The Couch", where the couch has a baby dust ball. The couches owner vacuums the dust ball up though, and the couch eventually dies of sadness.