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| | #1 |
| Gear interested Joined: Sep 2007 Location: Los Angeles
Posts: 8
Thread Starter | A home studio sound proofing project |
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| | #2 | |
| Gear Guru Joined: Oct 2002 Location: New Milford, CT, USA
Posts: 12,334
| Quote: --Ethan
__________________ Ethan's audio book is now available! | |
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| | #3 |
| Lives for gear Joined: Jan 2004 Location: USA
Posts: 1,016
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Yes, I just want to echo what Ethan has said with the multiple leaf design. If you look at the drawing that Ethan posted more closely, you can see that diagrams 3 & 6 (going from left-to-right) use *exactly* the same amount of materials, but diagram 6 has 23 dB more isolation!!! WOW!!!! (a 6 dB increase is twice as loud.) So just by going with a 2-leaf system rather than a 4-leaf system, using the exact same amount of materials results in a HUGE sound reduction benefit.
__________________ DH "Nobody goes there anymore; it's too crowded." -Yogi Berra |
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| | #4 |
| Moderator Joined: Dec 2002
Posts: 3,389
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'Tis true. Same with making control room windows; you don't want three panels of glass and two airspaces. With walls, the same exact same materials layed out properly vs. improperly can easily vary by 12+ dB of isolation. You want one, large airspace in the middle, and plenty of mass to either side. Breaking up the airspace and spreading out the mass (drywall in this case) is bad news. Google mass-air resonance and coincidence dip for more study on this subject.
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| | #5 |
| Gear interested Joined: Sep 2007 Location: Los Angeles
Posts: 8
Thread Starter | thank you
Good to know. The job we did cuts out a lot of mids and highs (leaf blowers, barking dogs, etc.) but doesn't do much for bass when someone pulls into the driveway blasting hip hop with a bumping stereo. If I were to fix my design then, I should put insulation of some sort to fill the inner and outer chamber, and leave the middle chamber empty? What material makes a good sonic insulation? I have a big bag of fluffy, compressible batting that is used inside pillows. Or do I need something denser? I kinda don't want to have any fiberglass or asbestos in this room. MWD
__________________ --Michael W. Dean "Clone The Homeless" Michael W. Dean's podcast that remembers when sex was safe and music was dangerous. http://www.clonet omeless.com ----------------- STINK FIGHT! Author, filmmaker, podcaster and gadfly Michael W. Dean's repository of the wretched and splendid. http://www.stinkfight.com |
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| | #6 |
| Gear interested Joined: Sep 2007 Location: Los Angeles
Posts: 8
Thread Starter |
Also, I cannot fill the outside chamber (the one between the glass and the first sheet of wood). We own our house, but have a persnickety homeowner's association that will send us nasty lawyer letters if anything looks funky from the outside. So it has to remain as is: a curtain hanging between the glass and the wood. If the curtain is pressed against the wood, the homeowner ass. folks will get testy. So should I fill the second and third chamber, or just the third chamber? The first (outermost) chamber (the one with the window glass on one side) is very small, maybe a quarter inch, and the glass doesn't cut much sound by itself (which is why we needed to do this in the first place), so I'm not sure that the first space really qualifies as a "chamber". Thank you. MWD |
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| | #7 | |
| Moderator Joined: Dec 2002
Posts: 3,389
| Quote:
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| | #8 |
| Gear interested Joined: Sep 2007 Location: Los Angeles
Posts: 8
Thread Starter |
Thank you. What should I fill it with? Is the fluffy batting used in pillows good? If I tamp it in good, squish it down? I can probably easily get to the first two chambers. Will not fill the final one, the one with the curtain that has glass on the outside. Will filling these two with tight batting help? Thank you. |
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| | #9 | |
| Gear Guru Joined: Oct 2002 Location: New Milford, CT, USA
Posts: 12,334
| Quote:
--Ethan | |
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| | #10 |
| Gear interested Joined: Sep 2007 Location: Los Angeles
Posts: 8
Thread Starter | Seriously? God I hate that stuff. Feels like death to work with. Any good cheap alternatives (please don't say asbestos!) also, would pillow batting do NOTHING? is there any reason NOT to put it in there if I don't pack it too hard? MWD |
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| | #11 | ||
| Gear Guru Joined: Oct 2002 Location: New Milford, CT, USA
Posts: 12,334
| Quote:
![]() Quote:
--Ethan | ||
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| | #12 | |
| Gear interested Joined: Sep 2007 Location: Los Angeles
Posts: 8
Thread Starter | Quote:
MWD | |
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| | #13 | |
| Moderator Joined: Dec 2002
Posts: 3,389
| Quote:
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