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Ugly Effective Acoustic Treatment. (Read 327 times)
GroovySauce
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Ugly Effective Acoustic Treatment.
09/16/20 at 15:07:07
 
I bought a box of 6 x OC 702 2Ē Plans are to make some absorbers. The acoustic transparent fabric has not yet arrived. I tried putting the box in the corner of the room behind the left speaker. †

As you can see it was very effective! at less than $100 this made a big difference in the suckout at 50-60hz and 140hz. It also dropped the 30-40hz range by almost 1db!

I also found ATS Acoustic sells Roxul scraps 20 pounds in a 25x49x12" box for $12! problem is it's a large box and heavy so it costs ~$50 to ship to the Philly suburbs. They are located in Illinois.

Still at $62 + a sheet to cover the box I think itís a bargain.

If you are going to work with Roxul take precautions. Some people are saying itís almost as toxic as asbestos.

Iím getting a few more boxes of 703 Iím thinking Iím going to leave the box in the corner and just cover it with a sheet.


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Lonely Raven
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Re: Ugly Effective Acoustic Treatment.
Reply #1 - 09/22/20 at 02:36:13
 
Very cool findings!

I'm glad to see you're taking measurements!

Don't forget, you have many, many more corners you could try your box-o-absorption in...middle wall between speakers, back wall, ceiling corners if you feel adventurous. Have fun with it...since you're measuring, you may as well figure out what wall/intersection works best!
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gsanger
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Re: Ugly Effective Acoustic Treatment.
Reply #2 - 09/22/20 at 03:46:27
 
Love it!  I'm a firm believer in room treatment, and love to see people actually putting it up...or, uh, stuffing it in the corner!
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GroovySauce
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Re: Ugly Effective Acoustic Treatment.
Reply #3 - 09/26/20 at 14:10:48
 
Thanks guys!

LR, I bought 5 boxes of 6x2" so I've tried a lot of positions. The front left was the most effective for a single box.

I'm slowly converting those boxes into panels.

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I built 8 so far, shooting to have another 8ish done next week. I estimate I'll need 14-18 2x4' panels to get the reverb to a good level. The lower frequencies I'm just going to have to live with for now.

Acoustic treatment is a tough sell until, you experience music in a treated room. It's all over after that, you become obsessed with it.

The cost per 25.25x49.5" panels are just under $30 each. that includes 703, fiberglass, staples, wood, wood glue, nails and acoustically transparent cloth.

tools used: chopsaw, drill, hammer, stapler, scissors, tape measure and pencil


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Lonely Raven
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Re: Ugly Effective Acoustic Treatment.
Reply #4 - 09/28/20 at 04:20:50
 

Next work on some QRD Diffusers and you'll really know room treatment!
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GroovySauce
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Re: Ugly Effective Acoustic Treatment.
Reply #5 - 09/28/20 at 14:30:52
 
I was thinking I would just not make any QRD Diffusers.... Well now I feel I have too!

The clarity is just going through the roof, it's so seductive right now! I'm only half way done with the absorbers.

Here is a room response with and without the panels. I did tweak the seating and speaker positions a little so, it's not 100% accurate representation of the effects.


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The reverb is coming way down too! was over 200ms is some areas now 90-130ms. shooting for 70-80ms
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Lonely Raven
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Re: Ugly Effective Acoustic Treatment.
Reply #6 - 09/29/20 at 23:21:14
 

Don't forget the ceiling - the typical reflection time from speaker to ceiling to seating position is 5ms to 12ms and will smear your imaging.

Just for testing sake, you would pin a moving blanket to the ceiling between you and the speaker and do your measurement and listen and see how it changes your imaging. If you get that Oh Wow! positive change in sound then consider making a cloud absorber or something.
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GroovySauce
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Re: Ugly Effective Acoustic Treatment.
Reply #7 - 09/30/20 at 01:16:10
 
I hear you, getting some absorption on the ceiling is needed. In this location, I cannot screw or put holes in the ceiling. Any thoughts for a solution?

My first thought is to make a pergola type structure with 2x4's. doesn't seem feasible right now. It will be a lot of material and getting all the parts and assembled would be a PITA.
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4krow
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Re: Ugly Effective Acoustic Treatment.
Reply #8 - 09/30/20 at 01:50:58
 
Wear a felt sombrero.
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