room gain?

[MaVo]

I allways wondered what people call basstraps. Those things you linked were maybe a few inches deep, which looks like an efficient midrange/highrange absorber to me but not something that i would use to remove bass resonances in my room. One might argue that using those could even be detrimental, since they remove more high frequency content, making the sound muffled. As it seems, the only promising thing to deal with bass problems is either a room in a room kind of thing with flexible walls which have high absorption in the lows or multiple subs or even both things. Or for those who cant afford such "all in" solutions, nearfield listening, sub behind the head, which is... something that one needs to get used to, to be polite.

[davygrvy]

An efficient bass trap is a resonating cavity filled with absorptive material.

[davygrvy]

correction ... some absorptive material

[davygrvy]

Want to panel a wall and make the paneling be a trap? Version A has a nice behavior for sucking out everything 250Hz-1kHz

[davygrvy]

Helmholtz Resonator Calculator

That's one style. Another is just a box panel filled with some fiberglass with the front plywood acting as a drum can be an LF absorber.

Here's a good article on bass traps.

If one is considering modifying their listening space's acoustics to improve sound, I think it would be worthwhile to get a few books on recording studio acoustics and follow the L.E.D.E. principles. Or do what is recommended for surround sound control rooms as per the AES recommended practices.

[planet10]

Originally Posted by davygrvy

If one is considering modifying their listening space's acoustics to improve sound, I think it would be worthwhile to get a few books on recording studio acoustics and follow the L.E.D.E. principles. Or do what is recommended for surround sound control rooms as per the AES recommended practices.

I would strongly suggest that you get Floyd Toole's book. Likely the best treatment of rooms to date. Many of the things in studio practise are not applicable to home.

dave

[davygrvy]

How so? Speakers won't be soffited most likely, there won't be a console, nor glass windows to the recording rooms.. What else is there that's different?

[planet10]

Get the book. Read it.

I'm not going to summarize because it just wouldn't come across. Floyd bursts quite a few myths.

dave

[davygrvy]

How about just one or two items of interest?

[planet10]

1/ turns out room shape is almost immaterial.
2/ 1st reflections are to be preserved (and their FR as close to the direct radiation as possible)
3/ you need at least 2 subwoofers and they should be mono.

dave