room gain? - Page 2

MaVo · 19th November 2009, 04:39 PM

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 · 19th November 2009, 08:28 PM

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

davygrvy · 19th November 2009, 09:02 PM

correction ... some absorptive material

davygrvy · 19th November 2009, 10:07 PM

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 · 11:31 PM

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 · 19th November 2009, 11:48 PM

Quote:

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 · 20th November 2009, 12:02 AM

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 · 20th November 2009, 01:27 AM

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 · 20th November 2009, 07:45 PM

How about just one or two items of interest?

planet10 · 20th November 2009, 11:08 PM

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

19th November 2009, 08:28 PM	#12
davygrvy diyAudio Member Join Date: Mar 2007 Location: Richmond, CA Blog Entries: 1	An efficient bass trap is a resonating cavity filled with absorptive material. __________________ This post was made from 100% recycled electrons.

19th November 2009, 09:02 PM	#13
davygrvy diyAudio Member Join Date: Mar 2007 Location: Richmond, CA Blog Entries: 1	correction ... some absorptive material __________________ This post was made from 100% recycled electrons.

19th November 2009, 10:07 PM	#14
davygrvy diyAudio Member Join Date: Mar 2007 Location: Richmond, CA Blog Entries: 1	Want to panel a wall and make the paneling be a trap? Version A has a nice behavior for sucking out everything 250Hz-1kHz __________________ This post was made from 100% recycled electrons.

19th November 2009, 11:28 PM	#15
davygrvy diyAudio Member Join Date: Mar 2007 Location: Richmond, CA Blog Entries: 1	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. __________________ This post was made from 100% recycled electrons. Last edited by davygrvy; 19th November 2009 at 11:31 PM.

20th November 2009, 12:02 AM	#17
davygrvy diyAudio Member Join Date: Mar 2007 Location: Richmond, CA Blog Entries: 1	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? __________________ This post was made from 100% recycled electrons.


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19th November 2009, 04:39 PM	#11
MaVo diyAudio Member Join Date: Jan 2006 Location: Herne	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.

20th November 2009, 01:27 AM	#18
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 3	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 __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi

20th November 2009, 07:45 PM	#19
davygrvy diyAudio Member Join Date: Mar 2007 Location: Richmond, CA Blog Entries: 1	How about just one or two items of interest? __________________ This post was made from 100% recycled electrons.

20th November 2009, 11:08 PM	#20
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 3	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 __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi

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