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PostPosted: Fri Dec 02, 2005 10:40 pm 
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Hey Guys,

I've collected some pics showing hangers and I've seen bass traps made only using wood and insulation, I think you call it 703.

My question is: Would it be done with wood and rockwool glued on, and what the difference between glasswool and rockwool for this specific purpose?


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PostPosted: Sat Dec 03, 2005 12:10 am 
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Quote:
My question is: Would it be done with wood and rockwool glued on, and what the difference between glasswool and rockwool for this specific purpose?


Yes and not much.

Have fun!
Andre


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PostPosted: Sat Dec 03, 2005 11:35 am 
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:) OK!

HAS SOMEONE DONE IT?

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PostPosted: Sat Dec 03, 2005 12:59 pm 
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http://johnlsayers.com/Studio/Pages/Somewhere.htm

The inner core is soft fibreboard. The wrapping is dacron wadding - i.e. like they line upholstery with.

cheers
john


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PostPosted: Sun Dec 04, 2005 2:43 pm 
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Ok,
But the pic shows that those bass traps weren't made up using rockwool on it! :?

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PostPosted: Mon Dec 05, 2005 3:43 am 
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I Think that I haven't formulated my question appropriatedly.
"LET ME TRY AGAIN":
INSTEAD OF GLASSWOOL INSULATION, COULD I USE ROCKWOOL ON THE MDF?
IS GLASSWOOL INSULATION BETTER THAN ROCKWOOL :?:


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PostPosted: Mon Dec 05, 2005 6:13 am 
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P750souza wrote:
I Think that I haven't formulated my question appropriatedly.
"LET ME TRY AGAIN":
INSTEAD OF GLASSWOOL INSULATION, COULD I USE ROCKWOOL ON THE MDF?
IS GLASSWOOL INSULATION BETTER THAN ROCKWOOL :?:


I gave a clear answer. To repeat more verbosely: Yes you can use rockwool instead of glasswool. One is not better than the other.

(New info) The important thing to look at is similar densities.

Have fun!


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PostPosted: Mon Dec 05, 2005 6:44 am 
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SORRY AVare

AND THANKS! I WAS IN DOUBT!

REALLY THANKS! :oops: :oops: :oops: :oops: :oops: :oops:

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PostPosted: Mon Dec 05, 2005 8:31 am 
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The actual HANGING part of a trap such as this uses a different principle for absorption - it actually relys on the hanging mass to move a little bit, somewhat similar to the "soft" styles of martial arts - in order for the bass sound waves to MOVE the hanging mass, they have to release energy - then that energy is no longer sound, but (slow) movement. Also, some of the energy is converted to HEAT, same as normal absorbent types of traps.

The "normal" way of building such a trap is to line it with the denser rockwool type materials, then wrap the actual hanging parts with lighter, fluffier insulation - part of the purpose of the lighter insulation is to keep the individual boards from banging against each other or vibrating; part is to absorb any higher frequencies as well.

As far as I know, there is no good reason to use one type of insulation over another, as long as you do NOT use any of the foam type insulations; but any fiberglass or mineral wool insulation should work.

The boards themselves can be hung as close to each other as you can get them and still have them hang freely; the more of them in a space (still free) the better the absorption. It's more efficient if the boards are neither parallel or perpendicular to the entering sound waves, but instead hung at an angle.

IF that was confusing, let me know and I'll try to post a rough sketch... Steve

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PostPosted: Mon Dec 05, 2005 4:54 pm 
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IF that was confusing, let me know and I'll try to post a rough sketch... Steve


I understood the principles, and your explanation was actually enlightening, but if you could add some drwaing, I'd appreciate! :idea:

Thanks again Steve

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PostPosted: Wed Dec 21, 2005 2:01 am 
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It's more efficient if the boards are neither parallel or perpendicular to the entering sound waves, but instead hung at an angle.


This may be nitpicky, but is there a preferred angle? Slight or severe? Interesting...


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PostPosted: Wed Dec 21, 2005 10:14 am 
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No preferred angle - a "herringbone" pattern would cause the sound to have to bounce off several (absorbed) surfaces before making its way back OUT of the trap. Part of the answer to this would depend on the available depth of your trap, but typically 30 degrees away from perpendicular to sound travel will work well... Steve


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PostPosted: Wed Dec 21, 2005 4:00 pm 
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Thanks for the explanation and the drawing.

This stuff is sickeningly interesting, like a giant strategic game. Just when you fight your way through one level, you fall through a trap door to face a new set of unknowns.

I really shouldn't have slept through science class.


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PostPosted: Thu Dec 22, 2005 1:33 am 
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I really shouldn't have slept through science class.


If you can withdraw from your sleep bank now, then several weeks of studying and finally building probably fulfill your needs. :D

Andre


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PostPosted: Thu Dec 22, 2005 2:41 am 
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:!: :!: :!: Wow :!: :!: :!:

:!: :!: CLAPS :!: :!:

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