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Old 1st February 2013, 10:17 PM   #1
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Default home brew woofer tester

Does anyone have any idea how to implement
a fast woofer tester ala the WT-3 ?
(works with a 'chirp' rather than a slow sweep)
I have this:
CircuitGizmos - USB interfaces and motion detectors, home automation, electronic devices
which will produce the chirp, and I believe has
ADC and computation enough to do the job,
but no idea as to formulas or even for sure
the hookup ...... Any input appreciated
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Old 2nd February 2013, 08:30 PM   #2
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Quote:
Originally Posted by hitsware View Post
Does anyone have any idea how to implement
a fast woofer tester ala the WT-3 ?
(works with a 'chirp' rather than a slow sweep)
I have this:
CircuitGizmos - USB interfaces and motion detectors, home automation, electronic devices
which will produce the chirp, and I believe has
ADC and computation enough to do the job,
but no idea as to formulas or even for sure
the hookup ...... Any input appreciated
Using the old method of a slow sweep would be a start ........
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Old 3rd February 2013, 09:02 AM   #3
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Using slow sweep is easy. You pretty much only need a resistor, some 3.5mm cables and a full duplex sound card (if you are using a laptop then an external one will more than likely be necessary). Use some software such as REW and you can measure the impedance, and use either added mass or delta compliance. It will calculate the T/S params for you.

See here Cables

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Old 9th February 2013, 06:10 PM   #4
tvrgeek is offline tvrgeek  United States
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Unless you wanted to do something out of the ordinary, like from an iPad or Linux, they are so inexpensive and the software works so well, just buy one.

I would guess they are using MLS. Sound Easy does it that way for only $350. ( And "easy" is not what I call it) I have the "slow" WT-2 and it is so easy, accurate and versatile, I see no reason to change. I export it's results into SE rather than use SE's method. WT-2 is far more accurate. Can't speak for the WT-3.
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Old 9th February 2013, 07:13 PM   #5
tvrgeek is offline tvrgeek  United States
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You have looked at LEAP? Comes with ARTA.
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