| mike.e |
Hi all
Topic i havent seen much solid info on
Im keen on measuring woofer distortion both baffled and unbaffled.-linkwitzlabs style,steady state sine and impulse.
Mainly consisting of THD and IMD measurements
Ive seen the site listed below-but its not highly useful due to different drive voltages used!
Questions
1-Is the FFT in cooledit accurate enough?Can do quite high FFT size,ive heard of people using it for specialist uses.
2-If i was to keep one thing constant-should it be drive voltage/power OR SPL
3-program to use hobbybox4/praxis demo/winmls etc
4-Baffle size when used? IEC size? Im only considering the bass frequencies so i think this isnt such an issue at all
RS SPL meter->cooledit recording line in-inspection of wave files with FFT tool
Il only consider outside measurements to keep it simple and not get into MLS/gated stuff.
Im keen on seeing the resonant effects of ported box vs horn vs IB etc!
-Hopefully my eyes will show what i hear
Apparently the TCsounds 2+ matches the XLS12 driver distortionwise!
When i overlay the two graphs to have the same fundamental amplitude-
xls seems to have more distortions(+10db) at 4th and 5th harmonic.
Cheers!
Mike.e
tc2+ vs xls www.mfk-projects.com |
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| mike.e |
No,ive vaguely heard of that one il check it out!
Im mainly looking for something thats user friendly but still pretty accurate and can compensate for nonlinear soundcards
Thanks! |
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| mike.e |
Ok ive got a list of software now
Speaker workshop(especially since its free)
Winmls
Clio
Praxis ...
Spectralab
What il do is download all of those-Do the measurements all at once,and see what i get!Compare results and see what works and whats hard to use...
And once chosen i could jump in and buy the one most suitable + a better mic than RS spl meter
Cheers! |
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| jdybnis |
| let us know what you decide on |
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| DSP_Geek |
| quote: | Originally posted by mike.e
Hi all
Topic i havent seen much solid info on
Im keen on measuring woofer distortion both baffled and unbaffled.-linkwitzlabs style,steady state sine and impulse.
Mainly consisting of THD and IMD measurements
Ive seen the site listed below-but its not highly useful due to different drive voltages used!
Questions
1-Is the FFT in cooledit accurate enough?Can do quite high FFT size,ive heard of people using it for specialist uses.
[....]
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The FFT in CoolEdit is quite accurate, far better than any sound card out there. I used it recently to debug a nasty aliasing problem for $DAYJOB.
Francois. |
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| mike.e |
My dad even used the FFT in cooledit2000 for Radio repeater fault diagnosis once! i told him it had a good looking FFT function,and he found a problem and solved it hehe
Il tell you guys what happens! Cheers |
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