Loudspeaker cabinet resonance measuring software.

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gentlevoice

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#1
Hi All,

Being interested in learning more about cabinet material resonances I've now bought an accelerometer, the ADXL001 from Analog Devices - link here:

ADXL001 Datasheet and Product Info | Analog Devices

( suggestion courtesy diyaudio member jcx )

that I would like to use to measure cabinet resonances.

To this end I'm looking for an (intuitive and simple to use) feasible software that will allow me to visualize the relevant data that are useful in relation to measuring resonance measurements. I'm thinking that real-time measurements are relevant as well as some plots indicating the decay & change of resonances over time (some waterfall plots?) ...

An inspiration has been these measurements on panzerholz and aluminum - although my sizes/weights will be much lower which is why I intend to use an accelerometer.

https://www.lessloss.com/page.html?id=80

However, this is not a field I'm much familiar with so I'd appreciate (straightforward-and-intuitive-to-use) software ideas & suggestions from others with more experience here ....

Cheers & thanks

Jesper
 
#4
GTI Predictive Technology (GTI Spindle) has developed an industrial quality App for I-Phone and I-Pads, for around $200. This does not include the required accelerometer and DAQ box, which would be quite expensive for industrial level devices. With time, may be more quality lower price alternatives will be developed to work with the I-Phone.

https://itunes.apple.com/gy/developer/gti-spindle-technology-inc./id477327962
 
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#5
Hi both - thanks for your feedback. I've looked into the links you've given and it looks interesting ... A few comments/questions:

@3ll3d00d: Yes, what I'm interested in is like the waterfall plot you link to. And it could be the Laud/Praxis software although reading on Liberty Instruments' webpages it seems to have been discontinued. And their new offer - which is the Omnimic (right?) - is a bit outside of my current price range - at least when investigating this. So your REW software link could be a way to go ... Do you know if it will accept input from a laptop's built-in microphone input? Or does it have to be via a USB connection?

@twinter: Thank you also for your links & ideas. As it is I only have a PC based computer (and it's not likely to change) so I will prefer a PC based system. Also, my reason for not buying an ACH-01 accelerometer is that it weighs quite a lot more - many grams whereas the ADXL-001 from Analog is only 154 milligrams. Thus the ADXL-001 is less likely to alter the results of the measurement. Regarding an accelerometer interfaceamp I should be able to make that myself - but thanks for considering ;-)

Just now I also remembered the ARTA software which I would normally consider for electronics measurements but apparently it also is capable of waterfall plots:

http://www.artalabs.hr/images/csd-window.gif

So I think I'll look into REW (depending on what it needs for inputs) and ARTA.

Thanks again for your feedback ;-)

Jesper
 
#8
gentlevoice said:
Being interested in learning more about cabinet material resonances I've now bought an accelerometer, the ADXL001 from Analog Devices - link here:

ADXL001 Datasheet and Product Info | Analog Devices

( suggestion courtesy diyaudio member jcx )

that I would like to use to measure cabinet resonances.

To this end I'm looking for an (intuitive and simple to use) feasible software that will allow me to visualize the relevant data that are useful in relation to measuring resonance measurements.
Click to expand...

I did something similar using MATAA.
 
#9
Hi mbrennwa ... Hmmm looks interesting ... In this context I'll start out with the accelerometer (due to very small sizes) but using a microphone basically will eliminate the influence the transducer has on the measured object. Will keep it in mind - thanks ;-)

Jesper
 
#10
Your deflections will probably be much less than a mm at say 100Hz
a=w^2*x
=628*628*1e-3=400m/s^2 => ~40G for +/-1mm of deflection (the boundary of the speaker would be blurry)

So using a ~3-4G full scale detector might get you better resolution, although I must admit I did not look at your data sheet other than to see it is a rather high g sensor.

Nearly any spl measuring system will give you results
Speaker Workshop
ARTA
HolmImpulse
Baudline (for linux-y types)
 
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