Resonance problem, need help to solve

edin
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Resonance problem, need help to solve Apr 30, 2019 0:34:54 GMT

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Post by edin on Apr 30, 2019 0:34:54 GMT

I need help to solve 2 frequencies, please if you can help.

So, one is 110hz, second one is little lower, around 102hz. Also on all next harmonics happening the same, not that loud of course. Lower than that is not a problem, we did a triple check.

So, my room is 4,80 meters long, 4 meters wide, 3,20 meters height. Tried to move speakers, both pairs. Tried to put extra panels and stuff, but just moves little bit and still ringing on that place. It's G#1 and A1, just around 110hz mostly, almost 6 dB over everything.

Did a corner treat with some bass weakners, did a panels around with apsorbtion, will put pictures.

I think that helmholtz resonator would maybe help, but need instructions how to make it. I found lot of calculators and formulas, but can't get it to freq I need, maybe not so good with that caluculations.

Thanks for your help!

All the best, Edin

Hexspa
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Resonance problem, need help to solve Apr 30, 2019 10:44:32 GMT

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Post by Hexspa on Apr 30, 2019 10:44:32 GMT

I wish my room looked that pretty. Here's the thing: you don't have enough broadband absorption in the room. While you could do a resonant absorber, none of us here are going to help you with it - for many reasons.

I advise you to either A. find the wavelength of those frequencies and the dimensions which correlate and apply absorption to those parallel surfaces. Remember that 1/2 wavelength dimensions also cause resonances. Your other option is B. which is to just deploy significantly more treatment on all your bare walls. While I prefer B in general, it looks like you're kind of set with your mojo.

Even so, a combination of A and B will give you a tighter response than the highly targeted approach of a resonant absorber. Option A is targeted but has the side benefit of reducing ambience and making the room more useful as a whole. I should add that 100Hz is not difficult to treat as it's well within the power band of your typical rigid panels.

Last Edit: Apr 30, 2019 10:47:05 GMT by Hexspa

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edin
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Resonance problem, need help to solve May 1, 2019 23:24:45 GMT

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Post by edin on May 1, 2019 23:24:45 GMT

Thank you for the really nice answer. This is situation, I had like la ot of panels on all the walls, which resulted with loosing a clear high freq part. And interesting is that only that one or two frequencies are peaking. Ok, there is a small drop deep down, but it's caused by this peak, we measured by drop the output 110 and harmonics

A space is wonderful, but doors on the sides and top wall (that is not real wall and it's apsorbing some highs) are just making some kind of 'gold cut' to get really nice and clear top.

I will attach my measuring mic record, on 70% of just top speakers, just so you can hear what is happening. So, if anyone can get me measurments and ida how to catch just this freqs, I would be thankfull.

Thank you, best.

Edin

test sound.mp3 (155.71 KB)

Hexspa
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Resonance problem, need help to solve May 3, 2019 17:52:01 GMT

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Post by Hexspa on May 3, 2019 17:52:01 GMT

If you want to target any frequency then you have to find the dimension(s) in your room which are 1x and/or 1/2 that frequency's wavelength. After you determine which surfaces are enabling the resonance, you add more broadband treatment to them - ideally 1/4 wavelength in thickness but even enough coverage with thinner panels should do the trick. I can't help you with resonant absorbers, however.

Last Edit: May 3, 2019 17:52:20 GMT by Hexspa

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