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Originally Posted by Brainchild  I'd be curious to see the results of that excruciating process of trial and error. |
I sometimes have trouble reading your posts...I can't figure if you're just making fun in general (as I do) or poking at me specifically because your annoyed with my questions. But I have to say, I giggled when I read this.
Quote:
Originally Posted by Jeffrey Hedback Lonely Raven,
First, quite impressive you can identify a resonance at 15-20Hz.
It's unlikely that any rigid fiberglass or minerwool will affect this range.
Best bet is to damp the material...in this case (and it would be trial and error...don't think you'll find anything in a book to assist):
- glue and otherwise properly secure a layer of a 2#/ sq ft, 1/4" Limp Mass Barrier (note, not the more common 1#, 1/8")
Look at: Soundproofing Material, Noise Control Curtains, Acoustical Panels, Soundproof Walls, Foam
that should damp the material to the point any "ring" is less or non-problematic.
WOW...I'm guessing your sub is setting this off??? |
Yes, I was thinking of car audio damping material as is used for loading down doors and the cabin of a car. But then, if I'm spending that kind of money on this, I might as well just build an Acoustically Transparent screen and be done with it.
Oh, and it's easy to discern the 15-20hz resonance...it's when the screen starts flapping like a bird about to take off. Not hard at all to see. A 21" sub with 2400 watts driving it tends to excite objects in the house.
You can hear the room rattling in this video. Around 15 Hz is the screen, 30Hz is the dogs kennel, and the whole kitchen excites between 22Hz and 27Hz.
YouTube - Maelstrom 21 Opus Dei Excursion Video.MPG