I am building a sub and have used UniBox to do so. I will eventually be adding a Linkwitz Transform to the sub to lower the Qtc and Fsc, but to do this accurately, I would like to be able to measure the pre-Linkwitz Qtc and Fsc of the sub. I can calculate it, but I imagine it may be quite different in reality.
I have a multimeter, oscilloscope, reference mic, signal generator (in computer). How do I do this? And yes, I searched but couldn't find what I needed...
Thanks!
I have a multimeter, oscilloscope, reference mic, signal generator (in computer). How do I do this? And yes, I searched but couldn't find what I needed...
Thanks!
Unless I'm missing it, those look like links on how to calculate those values.... not measure it. 🙁
The site apparently doesn't allow linking to frames....
Go to www.kbapps.com
Click on the link "Audio speaker design calculators"
Click on the link "Enter Calculators"
In the instructions page that follows, click on the word "parameters".
If that all seems too hard search on google for
"dick pierce impedometer"
I know it sounds like some sort of urological prosthesis rather than someting about speakers - but it will get you what you need.
Go to www.kbapps.com
Click on the link "Audio speaker design calculators"
Click on the link "Enter Calculators"
In the instructions page that follows, click on the word "parameters".
If that all seems too hard search on google for
"dick pierce impedometer"
I know it sounds like some sort of urological prosthesis rather than someting about speakers - but it will get you what you need.
Measuring impedance plot:
Hi,
For calculating Qt-box ant Fs-box you need to measure the impedance curve of your box first. Here you can download a nifty shareware program that does it for you automatically with the help of your soundcard.
If you measure the impedance curve with the help of your soundcard be sure it is very silent in your room/workshop. Note that your speaker acts as a sensitive microphone too. Sounds picked up by your speaker can blur your measurements.
And here an other picture about how to calculate Fs and Qt from the impedance plot:
http://www.linkwitzlab.com/images/graphics/f0Q0.gif
😎
Hi,
For calculating Qt-box ant Fs-box you need to measure the impedance curve of your box first. Here you can download a nifty shareware program that does it for you automatically with the help of your soundcard.
If you measure the impedance curve with the help of your soundcard be sure it is very silent in your room/workshop. Note that your speaker acts as a sensitive microphone too. Sounds picked up by your speaker can blur your measurements.
And here an other picture about how to calculate Fs and Qt from the impedance plot:
http://www.linkwitzlab.com/images/graphics/f0Q0.gif
😎
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