Pix Of Treatment

  • Thread starter Thread starter apl
  • Start date Start date
Nice treatment. It will be hard to beat that price, but for those interested here are some handy treatment/bass trap DIY's guides:

Build your Own Bass Traps: readyacoustics.com/DIY-BASS-TRAPS-MADE-EASY.pdf

Build Your Own Panel: acousticsfreq.com/blog/?p=62

(Sorry, can't post links yet)
 
Extremely nice setup you have out here...thanks for posting the pics buddy..i really like them..
 
I've got some OC703 sitting around (6.5 panels) and I was thinking about making some new traps. Everyone online seems to advocate stacking them and making traps that are 4 inches thick. Yours look like they are single ply. Did you consider doubling them up? Was there a reason why you didn't? Reason why I am asking is because I might do three 4 inch thick panels or I might do one 4 inch and four 2 inchers. Not sure yet. One reason why I might use the single ply is I am using them above areas of concrete floor to stop high pitch reflections.
 
ibleedburgundy said:
I've got some OC703 sitting around (6.5 panels) and I was thinking about making some new traps. Everyone online seems to advocate stacking them and making traps that are 4 inches thick. Yours look like they are single ply. Did you consider doubling them up? Was there a reason why you didn't? Reason why I am asking is because I might do three 4 inch thick panels or I might do one 4 inch and four 2 inchers. Not sure yet. One reason why I might use the single ply is I am using them above areas of concrete floor to stop high pitch reflections.
Click to expand...

I bought 1" thick and doubled them up for the bulk of the treatment.

Because I'm frugal, lol.

If you're hanging them from the ceiling, put some space behind them.

The physics is like this: The air molecules of a sound wave are oscillating between pressure and velocity. At the reflective surface the velocity is always zero. The 703 works by slowing down the molecules, that is, reducing their velocity. So treatment at the wall does nothing. As you move away from the wall, the treatment does more, until the wave basically gets through the treatment altogether. Anyway, 2" thick 2" from the wall will nicely absorb down to 800 Hz.

Good to have a reflective floor because your brain uses that echo to tell how far above the floor the sound source is. If the echo's missing, your brain's like, "Hmmmm, something's missing."
 
apl said:
The physics is like this: The air molecules of a sound wave are oscillating between pressure and velocity. At the reflective surface the velocity is always zero. The 703 works by slowing down the molecules, that is, reducing their velocity. So treatment at the wall does nothing. As you move away from the wall, the treatment does more, until the wave basically gets through the treatment altogether. Anyway, 2" thick 2" from the wall will nicely absorb down to 800 Hz.
Click to expand...

Right, correct me if I'm wrong but you could have (possibly) impacted frequencies down to 200 Hz had you stacked another layer and made them 3 inchers (and placed over corners).
 
ibleedburgundy said:
Right, correct me if I'm wrong but you could have (possibly) impacted frequencies down to 200 Hz had you stacked another layer and made them 3 inchers (and placed over corners).
Click to expand...

I wish I had measured the effect of the treatment, and I'm not sure how to calculate corner treatment effectiveness, but they worked really well, subjectively speaking.
 
ibleedburgundy said:
Right, correct me if I'm wrong but you could have (possibly) impacted frequencies down to 200 Hz had you stacked another layer and made them 3 inchers (and placed over corners).
Click to expand...

Oh, wait, that 800 Hz assumes flat, not corner treatment, 2" thick with a 2" gap.

3" + 3" would give you 533 Hz, roughly.
 
apl said:
I bought 1" thick and doubled them up for the bulk of the treatment.

Because I'm frugal, lol.

If you're hanging them from the ceiling, put some space behind them.

The physics is like this: The air molecules of a sound wave are oscillating between pressure and velocity. At the reflective surface the velocity is always zero. The 703 works by slowing down the molecules, that is, reducing their velocity. So treatment at the wall does nothing. As you move away from the wall, the treatment does more, until the wave basically gets through the treatment altogether. Anyway, 2" thick 2" from the wall will nicely absorb down to 800 Hz.

Good to have a reflective floor because your brain uses that echo to tell how far above the floor the sound source is. If the echo's missing, your brain's like, "Hmmmm, something's missing."
Click to expand...

A two inch absorber with a two inch gap will absorb almost 100% down to 400 Hz, not 800 Hz. And you'll still get up to about a .5 absorption coefficient down to 200 Hz, which is still significant.
An absorbers effectiveness is not strictly dictated by it's distance from a wall, but many other factors. Feel free to play around with the following calculator:
Porous Absorber Calculator - Results
 
GIK Acoustics said:
A two inch absorber with a two inch gap will absorb almost 100% down to 400 Hz, not 800 Hz. And you'll still get up to about a .5 absorption coefficient down to 200 Hz, which is still significant.
An absorbers effectiveness is not strictly dictated by it's distance from a wall, but many other factors. Feel free to play around with the following calculator:
Porous Absorber Calculator - Results
Click to expand...

Yeah, I was thinking of the quarter wave for 4", and you do get more than that. My oversight.
 
I don't remember where most of those posts are, but here's one from a few wweks ago.
 
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