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Old 21st February 2005, 12:26 AM   #11
JonPike is offline JonPike  United States
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Cool thread...

Very interested in seeing what kind of measurments you get, moamps!

I was interested in exploring in this area.. researched what was available at Digikey after remembering they had various accelerometers. I picked that one out BEFORE I found the LAUD article.. ;-) Guess I still know how to spec parts..

Havent had the time to buy one and play around though.. I have been using the very cheap and dirty method of a $5 mechanics stethoscope to listen to the panels as music is being played.. One can get a rough idea what and where it is "singing".

Kinda harder to quantify exactly how much difference changes make due to the subjective nature.. but again, you can get a rough idea..

Someday, I'll have to add the real deal to the toolkit...
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Old 21st February 2005, 01:12 AM   #12
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I've used the ACH-01 with Speaker Workshop with good results. Here's a sample of panel measurements:
http://ldsg.snippets.org/HORNS/images/random/cld.jpg
White was 3/4" MDF, and everything else was some sort of CLD construction, although I forget the exact details off hand. That is acceleration converted to dB (by SW). I never worry about trying to calibrate the system when I use it this way. It's all relative measurements. You just have to make sure what ever is doing the shaking is run at the same level for all measurements.

I've also used used this to measure cone excursion. I calibrated my preamp and then recorded the output from the accelerometer with a signal analyzer. This correlated very well with predictions from modeling programs. I've also used SW to do these measurements, but it was uncalibrated.

You can do quite a bit of stuff with these things considering that it only costs $20 or so.
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Old 20th January 2010, 01:44 AM   #13
domtw is offline domtw  France
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This is quite an old thread but interesting...

I would like to know if there are some of you using accelerometers to measure enclosure vibrations.
The ACH-01 seems to fit this application. Are there other/better models now?
Would a microphone preamp work as the accelerometer amplification?
How do you mount the accelerometer onto the panel without damaging its finish ?
Let's bring this back up!
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Old 20th January 2010, 02:03 AM   #14
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I've been using an Analog Devices multi-axis accelerometer mounted on a breakout board that I got from Sparkfun.com. Not for speaker stuff, but you could get it in a higher max acceleration value if necessary. I was measuring acceleration on unfinished panels so can't really help with that.
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Old 20th January 2010, 03:38 AM   #15
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There was an article some years ago in AudioExpress. It was very interesting. I would like to play with this myself.
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Old 20th January 2010, 03:40 AM   #16
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i am using the ACH-01 with Praxis and up tp 1kHz it works just fine.
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Old 20th January 2010, 06:57 AM   #17
domtw is offline domtw  France
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Do you use an amplifier ?
What voltage do you use for V+?
Can you tell us more about your setup?
I don't know Praxis, I would use it with SE or Arta, connected to my sound card input (through a mic preamp if necessary).
I was thinking that it might be possible to use the phantom power of the mic preamp.
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Old 20th January 2010, 09:11 AM   #18
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The company that makes the ACH-01 also makes a preamp that i use. Of cause you need a poweramp to drive the speakers that you measure.
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Old 20th January 2010, 11:44 AM   #19
domtw is offline domtw  France
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For those who are interested, I found this.

The amplifier is now quite expensive (250US) so I might build the booster/buffer circuit described in the document.

I have a question for the electrnician experts:
on fig.3: is it one single IC drawn two times for clarity, or there are 2 ICs ?
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Old 20th January 2010, 02:07 PM   #20
ente is offline ente  Germany
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... the ACH-01 works fine with the circuit of Bill Waslo. The one and only thing to note is good shielding because the ACH-01 is very sensitive to hum.

Regards
Heinrich
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