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Old 21st March 2017, 01:15 AM   #431
bengel is offline bengel  United States
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Just a quick update....

So I took my heat gun to it and made a *big* difference.... dropped the resonance down to 114hz almost exactly. I get the most "visible" excitement at this frequency consistently across the membrane... there are other modes of excitement as well but this one is quite obvious.

The bad news is I burned a tiny hole in the membrane with the heat gun. I put a little piece of the tyvek tape over it. It is on the bottom and not terribly visible so I may just live with it. Haven't decided yet...

It appears there is less strain in the membrane just from the "rainbow" diffraction patterns I was seeing before under fluorescent light, they were all twisted....now they are fairly straight and less visible. I will try photographing it on the next one but suspect it will be difficult.

I will probably do my next panel the same way... I like the idea of going a little over with tension then heat treating it "anneal" it out. No idea at all if it makes any sonic difference, just seems like it should.

I did also want to note that I plan on covering my panels with silk screen for damping.
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Old 21st March 2017, 08:47 PM   #432
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Awesome, that's great news!
Also one hell of an "Aha!" moment for me, I had no idea...
New one in my book, and a game changer as far as I'm concerned.

If you're going to be covering these, I wouldn't let the burn bother me unless it affects the sound negatively..
Roll with it bengel, you're almost done, haha..

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Last edited by wreckingball; 21st March 2017 at 08:58 PM.
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