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Soundproofing Forum Topics => Soundproofing Windows and Doors => Topic started by: condonoise on June 06, 2010, 04:12:21 PM

Title: soundproofing solution to low frequency?
Post by: condonoise on June 06, 2010, 04:12:21 PM
I have floor to ceiling windows and I am getting a constant low humming sound in my bedroom (most likely from ventillation units across the building or even from idling of engines on train station 1/2 mile across).
The windows are double pane (two 1/4 inches with 1/2 inch gap I think).

I recorded the sound on my phone and looked at the FFT spectrum in Matlab, looks like there is a dominant tone at 187 hz, the magnitude of which keeps on going up and down over time.

I looked at several options on this website and one of the solutions is to have an extra layer of window.
If I get a 1/4 inch laminated glass with about 2 to 3 inches air gap from the original double pane...will it solve the low frequency problem ....or will it even introduce another frequency altogether?

Thanks
Title: Re: soundproofing solution to low frequency?
Post by: Randy S on June 07, 2010, 04:00:22 PM
I would go ahead and do the second panel of glass with a larger than 2" gap, however I suspect that you will have a minimal reduction and the LF your experiencing will continue to remit through the structure of your building itself...put your head to the wall when you hear this LF and see how clear you can hear it this will determine that value.
Title: Re: soundproofing solution to low frequency?
Post by: condonoise on June 07, 2010, 04:48:51 PM
Thanks for replying.
 The entire side facing outside is glass windows( 6 pieces of glass with metallic frame between glasses)
I can get the glasses covered individually, but don't know whether I have to worry about the metallic frame
When I place my ear against the side walls I hear all sorts of sounds
Title: Re: soundproofing solution to low frequency?
Post by: Randy S on June 07, 2010, 05:32:21 PM
tough call....the frame will still vibrate and remit the LF. This is where it becomes difficult making cost effective recommendations.
You will have to make this call yourself, I would say that if you naturally look at the windows when this problem accures then I would to the second panel. If you experience the LF all around and not focued at this location I probably would weigh the cost of the second panel to a 10% reduction value at most.
Title: Re: soundproofing solution to low frequency?
Post by: damigupta on June 13, 2011, 03:00:34 AM
Hi,
I have the same problem, what solution worked for you? I have one set of sliding doors and 2 sliding windows...
Title: Re: soundproofing solution to low frequency?
Post by: Randy S on July 26, 2011, 08:57:55 PM
This is a solution for window noise abatement, the only way to handle sliders would be a new wall with second slider installed or a curtain w/ 50% pleat floor to ceiling.