Suggestions for these cheap 15"? Frisbee?

[ßart West-VL.]

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...

 

[Djim]

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!?! 😀

 

[tomtt]

passive radiators ...

 

[ßart West-VL.]

oops... now I'll have to measure again, should be 835cm²😱

 

[ßart West-VL.]

Looks a lot better but still needs a box of 8000l or 280ft³ for a Qtc of 0.8 😱
With 176l or 6.265ft³, 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. 🙁

 

[Moondog55]

OB bass

 

[chris661]

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.

 

[Djim]

Looks a lot better

It looks more...euh...'realistic' 😀. Btw is that the first measurement from your new measuring system?

 

[ßart West-VL.]

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.