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Post by oldschoolsound on Jan 26, 2017 20:25:46 GMT
First, the room that is getting finished will be acoustically treated the way Rock and Ethan have advised, so this question is not to see if I can eliminate proper treatments.
Just wondering if a rough finished and grooved (approx 3/8" deep every 8") surface would have any noticeable effect on the sound - since there will be some dispersion all around the room - that could be helpful (at least with higher frequencies) or harmful (confusing the sound stage) to the resulting sound. Or would the biggest difference be in how they made the room look?
Thanks!
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Post by Hexspa on Jan 27, 2017 3:38:23 GMT
Only one way to find out and that's testing. I'm guessing the difference would be less than placing a bicycle in the room - negligible compared with the effect of well-placed treatment.
-m
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Post by oldschoolsound on Jan 27, 2017 13:51:56 GMT
Hexspa,
You are right that testing a finished room would be best, but was hoping there had already been some research done since I'm not in the position to build the room out only to completely re-do the walls. The only information I've found online was about smooth vs. finished ceilings. That, along with the fact that I had not heard of scatter plates before this project prompted the question.
Last time I was serious about audio was in the late 70's when placing the speakers along the long wall was the norm and treatments were all about absorbtion. So, if, since that time, there's hardly any information on the surface of the walls compared to all the information and misinformation that's out there about acoustic treatments, maybe it has the effect of adding a bicycle in the room as you supposed.
The biggest concern would be having a textured wall that scatters the sound in a way that takes away clarity or focus from the sound stage.
Thanks again.
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Post by rock on Jan 27, 2017 23:10:56 GMT
I agree it's probably not much of a difference if anything at all. I think it's mostly visual aesthetics but that can affect how you "feel" but through your eyes not your ears.
If you consider the wood paneling is as rigid and solid as drywall, diaphragmatic action of the wall, which can effect LFs is the same and probably negligible in either case.
Considering the effect on HF, one tenth of an inch is the length of 135kHz sound wave and 3/8" is the length of a 36kHz wave. A wall surface like rough sawn wood could only have influence on ultrasonic frequencies.
You should not expect to hear any difference.
Cheers,
Rock
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Post by oldschoolsound on Jan 28, 2017 0:46:31 GMT
Rock,
Thanks for helping out with this question too. Showing the length of sound waves definitely helped show were any influences would be taken place. Definitely inconsequential to these old ears.
You mentioned diaphragmatic action of the wall. I had considered a wood fiber board similar to OSB that had a nice stucco finish, but it was only 7/16" thick and had a lot of bend to it when lifted by the edge. Thought it was to flimsy to work well in a listening room. Is that what you mean?
By the way, the movie about Bobby Darin made a good point of people hear what they see. So I'll go with what I like the looks of the best.
Thanks again.
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Post by Hexspa on Jan 28, 2017 1:59:46 GMT
Your pet whale on the other hand
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Post by Hexspa on Jan 28, 2017 2:02:43 GMT
By the way, the movie about Bobby Darin made a good point of people hear what they see. So I'll go with what I like the looks of the best. Good point. |
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Post by rock on Jan 28, 2017 2:14:11 GMT
Yes, but when you attach the panel to studs on 16" centers, that will stiffen the board but again, the whole diaphragmatic thing is probably fairly insignificant compared to room modes, especially when the panel is damped with insulation.
Cheers,
Rock
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Post by oldschoolsound on Jan 28, 2017 22:33:51 GMT
Thanks again guys. Time to get what looks good and then tend to the proper treatments.
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Post by Ethan Winer on Jan 30, 2017 20:20:44 GMT
You can approximate diffusion frequencies based on depth. I'm sure that a 3/8" slot every 8 inches will not give even a little useful diffusion. 1/4 wavelength for 3/8" is about 9 Khz, but the 8" spacing negates even that.
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