|
Room Acoustics Forum by Rives Audio Welcome! Need support, you got it. Or share you ideas and experiences. |
|
|
|
Room Acoustics Forum by Rives Audio Welcome! Need support, you got it. Or share you ideas and experiences. |
|
In Reply to: Ping Ethan, please.... posted by Winston Smith on June 7, 2012 at 16:56:30:
1) I'm pretty sure the width won't change the resonant frequency because that's determined by the mass of the panel and the depth of the cavity. However, a wide piece of plywood can vibrate in ways other than in and out as a piston. See the animations on this page:
http://www.acs.psu.edu/drussell/Demos/MembraneSquare/Square.html
You want the plywood to vibrate as the "1,1" mode on the far left, and I'm not certain that will happen if the panel is so wide. My best suggestion, just to be sure the traps work right, is to cut the rigid fiberglass to be half as wide.
2) You really do need rigid insulation of some type. The fluffy stuff will touch the panel and damp it, which you don't want. If you absolutely can't find what you need, use 3-inch thick fluffy insulation and hold it against the back of the "box" with chicken wire or some such. Another option is acoustic foam one inch thick, but it should be a flat panel without the sculpted surface. Sculpting removes half the material!
3) Again, nothing should touch the wood panel, from the inside or outside. I mounted rigid fiberglass in front of some of my wood panel traps, those at reflection points, with a 1/4 inch air gap. If your foam is stiff enough to not flop around and touch the wood, that would work for you too.
4) Drywall is way too massive to put in front of fiberglass. Fluffy fiberglass is fine for triangle-shaped corner traps, because they're so deep, but the front should be fabric or maybe thin cardboard.
--Ethan
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Ping Ethan, please.... - Ethan Winer 12:05:59 06/08/12 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
