DIY measurement cabinet resonances?

[JasonP]

If there an affordable method to assemble and use an accelerometer in order to measure cabinet panel resonances? I know you can get them from digikey, but I'm have a hard time picturing the rest. Would it be: accelerometer -> jig -> sound card -> (magical level adjust) -> measurement software? Is there an unknown cost here because if its just a jig needed, the cost seems reasonable.

Also, could you just use a measurement mic very close to the panel and knuckle rap it, record the response, and run that through an FFT transform to see what peaks showed? That seems so simple that it can't work :P

[Zach C.]

Re: DIY measurement cabinet resonances?

http://www.libinst.com/accel.htm

I've still got morning brain or I'd say more. :rolleyes:

Zach

[carlspeak]

Re: DIY measurement cabinet resonances?

If there an affordableinexpensiveimethod to assemble and use an accelerometer in order to measure cabinet panel resonances? I know you can get them from digikey, but I'm have a hard time picturing the rest. Would it be: accelerometer -> jig -> sound card -> (magical level adjust) -> measurement software? Is there an unknown cost here because if its just a jig needed, the cost seems reasonable.

Also, could you just use a measurement mic very close to the panel and knuckle rap it, record the response, and run that through an FFT transform to see what peaks showed? That seems so simple that it can't work :P

If you have holmimpulse you can purchase an Inexpensive mic from Meniscus.

[billfitzmaurice]

Re: DIY measurement cabinet resonances?

Also, could you just use a measurement mic very close to the panel and knuckle rap it, record the response, and run that through an FFT transform to see what peaks showed? That seems so simple that it can't work :P

Sometimes the simplest solution is the best. :applause:
Drummers don't use dial indicators to adjust their heads.

[Face]

If you have holmimpulse you can purchase an Inexpensive mic from Meniscus.

I believe you can use it with ARTA as well.

[carlspeak]

Re: DIY measurement cabinet resonances?

Sometimes the simplest solution is the best. :applause:
Drummers don't use dial indicators to adjust their heads.

Agree the knuckle wrap test does work well for locating areas in need of bracing. A test mic and software helps quantify the frequency and intensity of the resonance and may be able to help pinpoint its location. In my experience, cabinet resonant frequencies can run in the 100-500 hz range.
Here's what a holmImpulse test looks like using the Meniscus Audio accelerometer. Note the bump around 400 hz.



Here is a link to that microphone. It's got a small 1mm jack to plug into your sound card or computer audio input.

http://meniscusaudio.com/accelerometer-p-233.html