Wild Burrow Betsy Ported Speaker - diyAudio
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Old 16th December 2012, 09:49 PM   #1
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Default Wild Burrow Betsy Ported Speaker

I am a beginner to speaker building, but I have been researching designs for about a year now and am ready to start building.

So, I took a look at the Wild Burrow Betsy speakers. I want to utilize a full range driver, since being familiar with electrical engineering I cant help but feel crossovers are more trouble than they can be worth with a simple project, and just another variable in the design that can go wrong.

I want relatively balanced sound, but I do like my bass. If I use the Betsy in a ported enclosure, it ends up being huge (55" x 34" x21") but that doesn't phase me. I also get (according to design calculators) an F3 of 18 hz, which is plenty low. The only problem is the parameters of the Betsy:
Re 5.9 ohms
Fs 49.630Hz
Sd 22.966
BL 4.166
Qms 4.567
Qes .945
Qts .783
Spl 92.4db
Vas 86.387L
Mms 8.916g
Is it wise using a driver in a ported system with such a high Qts? Is there some factor that I am not considering with my driver choice that could lead to disaster? Im just looking for some guidance here before I commit.
(I also modeled the Betsy K, but I don' like what happened to the bass extension)
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Old 17th December 2012, 03:18 AM   #2
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What design calculator did you use?

I can't see using a driver with a Qt over .7 in a vented box. It would take a pretty big sealed box to keep it from booming badly. Betsy is meant for open baffle use. Should be pretty nice on OB, though.

If you want a box speaker you really need to use Betsy-K. The box still winds up being pretty big, but you should be able to get a quality 40 Hz. Search the archives for an MLTL design for Betsy-K, that's probably what I'd build given the choice.

You won't find a lot of full-rangers that will dig below 40 Hz, 18 is a pipe dream IMO. That's sub-woofer territory. A full-range + sub (aka FAST around here) might be a better target design.

Happy hunting!

Bill
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Old 17th December 2012, 11:04 AM   #3
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I used the MH audio calculators. mh-audio.nl
So how does one go about the design of a MLTL? Are there any preliminary calculations for the port or do you really just build a TL and stick a port on it and tune? Could i build a mass loaded BIB?
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Old 17th December 2012, 12:42 PM   #4
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You should revisit your simulation. You're not going to get F3 @ 18 Hz out of any design with either Betsy. You're not going to get F3 18Hz with any 8 inch driver. A reasonable design for Betsy or BetsyK will be F3 ~45 - 50Hz w/ F10 ~40Hz. The driver doesn't have much excursion so you can't expect extremely low FR.

Quote:
Originally Posted by Dumbledog View Post
I am a beginner to speaker building, but I have been researching designs for about a year now and am ready to start building.

So, I took a look at the Wild Burrow Betsy speakers. I want to utilize a full range driver, since being familiar with electrical engineering I cant help but feel crossovers are more trouble than they can be worth with a simple project, and just another variable in the design that can go wrong.

I want relatively balanced sound, but I do like my bass. If I use the Betsy in a ported enclosure, it ends up being huge (55" x 34" x21") but that doesn't phase me. I also get (according to design calculators) an F3 of 18 hz, which is plenty low. The only problem is the parameters of the Betsy:
Re 5.9 ohms
Fs 49.630Hz
Sd 22.966
BL 4.166
Qms 4.567
Qes .945
Qts .783
Spl 92.4db
Vas 86.387L
Mms 8.916g
Is it wise using a driver in a ported system with such a high Qts? Is there some factor that I am not considering with my driver choice that could lead to disaster? Im just looking for some guidance here before I commit.
(I also modeled the Betsy K, but I don' like what happened to the bass extension)
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Last edited by fastbike1; 17th December 2012 at 12:44 PM.
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Old 17th December 2012, 01:26 PM   #5
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You can put that driver in a reasonably sized sealed box for good results too. Had mine in a 1.3 cf box. Add a sub if you want deeper, more powerful bass.

Zilla
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Old 17th December 2012, 11:32 PM   #6
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Dumbledog: I own both the Betsy and the Betsy K. Both are WELL worth the price of admission. I have the Betsy K in a MLTL with a 4 inch diameter one inch port. This happened to be a cabinet I built two years ago for a different driver, but with a "baffle adapter", it now fits. Perhaps the cabinet dimensions are not optimal, but it sounds decent.

I put the regular Betsy in a resonant style, Auditorium 23 Rondo clone style enclosure. I also use one in a very large open baffle. There are threads on both in the Wild Burro section.
My personal opinion is that one can't go wrong with a Betsy in a large open baffle.

[IMG]Click the image to open in full size.[/IMG]
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Old 18th December 2012, 12:11 AM   #7
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I was thinking about the open baffle. Maybe it would be worth adding a crossover and woofer to the design. Less cost in materials too, with the potential for stronger bass.
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Old 18th December 2012, 05:59 AM   #8
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Hi Dumbledog

This driver would do fine in a quarter wave, like an XL version of my TABAQ. Dont expect very deep bass, however, as already mentioned in this thread.

MJK´s models are very good to predict the result of a given design and also helps you calculating the baffle step circuit. Yes, you still might need some filters even with a full range.

Give me a couple of days to simulate a suggested MLTL design for this driver.

Hi from
Bjorn
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Old 18th December 2012, 06:31 AM   #9
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Quote:
Originally Posted by Dumbledog View Post
I was thinking about the open baffle. Maybe it would be worth adding a crossover and woofer to the design. Less cost in materials too, with the potential for stronger bass.
Having had them in a cabinet and open baffle, I would encourage you to consider starting with just the Betsy on a very large baffle, if WAF isn't a factor.
Not only will you be surprised by their bass, but you'll be hooked by the lack of box coloration and openness. The trifold, piano hinged baffles, like the one on the burro website are quite nice for experimenting. It allows one to see how much the sonics are affected by baffle width.
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Old 18th December 2012, 09:37 AM   #10
nesha is offline nesha  Serbia
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Wild Burro Audio - diyAudio
Plenty of options, OB fo Betsy or MLTL and TQWT fo BetsyK...
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