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 Post subject: Minimum slot width
PostPosted: Wed Jan 09, 2019 3:58 am 
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Joined: Tue Dec 12, 2017 4:11 pm
Posts: 4
Location: Helsinki, Finland
Hi there,

Is there any minimum slot width for slat resonator? What happens if the gap is for example 1mm? I have a ceiling that is going to be built out of 95x15mm wood. The ceiling is angled and there is 30-80cm space behind with lots of cotton wool. I would like the ceiling to affect the 38Hz room mode as much as possible. However, looking at the simulation the gap should be just 1-2mm wide to get the maximum effect. Are there any problems using a gap this small?

Link to simulation with slats with 2mm gap vs. no slats. The absorption coefficient gets about 0.15 better with slats:

http://www.acousticmodelling.com/mlink. ... =1&d24=200


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 Post subject: Re: Minimum slot width
PostPosted: Wed Jan 09, 2019 6:24 am 
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Joined: Thu Aug 21, 2008 10:17 am
Posts: 11727
Location: Santiago, Chile
I would not try to hit a 38Hz mode with a slot resonator: Slots are good for the mid and low-mid range, but not so much for the low end. If you are going after a specific modal issue, and do not have any other low-end issues, then I'd suggest going with a panel trap (membrane trap). You can tune those fairly low with good results.

- Stuart -

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