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Wild Burro Audio DIY full range speakers from Wild Burro Audio Labs

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Old 29th May 2018, 08:50 PM   #1
Karl71 is offline Karl71  United States
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Default Betsy-K: Big & Sealed

After emailing Douglas regarding cabs for a pair, he recommended two cubic foot sealed boxes. I prefer a sealed alignment. I have dimensions for such boxes. Has anyone tried this? If so, what about off-setting the driver? If so, how much? BSC correction? How wide the baffle?

Iíve built several pairs of speakers, but this is a new one to me in that itís a ďlargeĒ single driver in a large sealed box. I have also never dealt with BSC.

Regards,

Karl
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Old 3rd June 2018, 01:43 AM   #2
d to the g is offline d to the g  United States
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Karl,

This forum is pretty quiet. You may want to post up in the fullrange forum.

D
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Old 3rd June 2018, 02:03 AM   #3
Karl71 is offline Karl71  United States
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Douglas -

Yeah, I’ve gotten that impression.
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Old 3rd June 2018, 02:49 AM   #4
freddi is offline freddi  United States
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Betsy-K: Big & Sealed
here's a simple sim of Betsy K in a sealed box of 2 cubic feet

Click the image to open in full size.
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Old 3rd June 2018, 03:31 AM   #5
Karl71 is offline Karl71  United States
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Freddi -

Thanks very much for the sim.

I’m considering a pair of Altec 618 clone boxes. I have a carpenter whom I think would make them for me.
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Old 3rd June 2018, 03:40 AM   #6
freddi is offline freddi  United States
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Betsy-K: Big & Sealed
no problem - you're most welcome.
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Old 3rd June 2018, 04:41 AM   #7
pjanda1 is offline pjanda1  United States
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Big sealed boxes were the first thing I tried with the speakers that later became the BetsyK. (To be honest, the first cabs for them were an old pair of CL Sansuis with the drivers pulled out and a piece of MDF screwed right over the top of the original baffle.) If you don't want to use BSC, you definitely want something like that Altec box placed close to boundaries.

If you can tolerate some size and width but want something simple, GM posted a big triangular TL for them quite a long time ago. I'm not sure anyone has ever built it, but it promises more bass than a sealed box.

Paul
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Old 3rd June 2018, 06:08 AM   #8
Karl71 is offline Karl71  United States
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Perhaps I’m missing something - The response in that box looks pretty bad in that it drops off very quickly after 1000Hz. That not full-range.
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Old 3rd June 2018, 06:39 AM   #9
freddi is offline freddi  United States
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Betsy-K: Big & Sealed
hornresp only considers power response - not what can happen with narrowing dispersion or breakup region. On, axis the published graph is pretty much what I saw my Betsy-k mounted in a 28 inch tall by 12 inch wide Karlson - box - imo, BetsyK has a nice sound on vocals in general.

Betsy-K: Big & Sealed
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Old 3rd June 2018, 09:12 AM   #10
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by freddi View Post
hornresp only considers power response
Hi freddi,

For multiple-segment horns yes, but not for other loudspeaker types :-).

The attachment shows the on-axis pressure response for your 2 x Pi direct radiator example.

Kind regards,

David
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