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Old 15th December 2012, 06:40 AM   #1
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Default Suggestions for these cheap 15"? Frisbee?

I measured one of my old 40-9000 driver from RadioShack / Realistic.
3 out of 4 are still good, 1 has a voice coil that measures way off.
What can I do with these besides using them as a salad bowl?
Measurement was done on only one of them with the added mass method and yes, I thing the result is correct.
Measuring other drivers gave very good results, so these really must be the worst drivers I've ever seen...
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Old 15th December 2012, 06:55 AM   #2
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Measurement was done on only one of them with the added mass method and yes, I thing the result is correct.
1425cm^2 for a 15inch!?!
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Old 15th December 2012, 08:14 AM   #3
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Old 15th December 2012, 08:45 AM   #4
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oops... now I'll have to measure again, should be 835cm▓
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Old 15th December 2012, 09:40 AM   #5
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Looks a lot better but still needs a box of 8000l or 280ft│ for a Qtc of 0.8
With 176l or 6.265ft│, the Qtc is at 1.5 and the response doesn't look half bad now.
-3dB at 32hz and a bump of 4dB at 52hz

Still, suggestions are welcome of course.
Would isobaric turn out well? The efficiency is a bit low for that, I guess.
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Old 15th December 2012, 10:01 AM   #6
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Old 15th December 2012, 01:48 PM   #7
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Or IB.


I'd stuff all of them in a tiny sealed box, and boost 12dB/octave from the crossover point.

Give it a clean kW of power, and you've got a powerful subwoofer.
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Old 15th December 2012, 06:56 PM   #8
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Looks a lot better
It looks more...euh...'realistic' . Btw is that the first measurement from your new measuring system?
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Old 16th December 2012, 05:59 AM   #9
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Lol, good one

First measurement was a B&W 200/4 (8" driver)
Second Visaton FRS8
This 15" was the 'turd' one. haha

Now I'm going to measure the other 15" woofers.
Yes, also the one that has the bad voice coil, could be educational to me.

PR, OB, IB are attractive, I which I had the possibility for IB.
For PR, these drivers aren't worth the extra money.

Thanks.
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