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Old 11th June 2013, 04:12 PM   #1
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Default Betsy's are on their way...

I have some Wild Burrow Betsy full range drivers hopefully arriving in the next few days.

I love the look of these by FleaWatt

Click the image to open in full size.
http://fleawatt.blogspot.co.uk/2012/...nkey-kong.html

He lists the baffle as 3'8" x 3'8".

Does anyone have any other plans I could use as a starting point. I would like to try flat baffles first, not wings or H frames...

I have some Macassar Ebony and Birds Eye Maple veneer, and will use 18mm ply for the panel.

Any advise or tips much appreciated.

Thanks

Last edited by Studio Au; 11th June 2013 at 04:18 PM.
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Old 11th June 2013, 05:09 PM   #2
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the larger the baffle, the deeper the bass.
I'd recommend 24" from speaker edge to baffle edge.

You can put them on hinges.
As long as I wrapped the back of the drip in foam, I could fold the wings back parallel or make a pseudo triangle box (not sealed).
My wife liked 6' tall, 12" wide, with swept back wings.
But mine rolled off at 200hz (15" deep wing and a higher mass corner (Fs/qts)).
My 1/2" birch ply "sang" (buzzed) on a James Taylor song, you may have to add some 2" x 2" x 2' to the back.


My 4 x 4" open backed box went deeper (2' wide x 2' tall x 2' deep).

The beauty of the open baffle is you can have a +3db to +6db in the bass that sounds lovely compared to a 12" wide sealed box with no baffle step.

Click the image to open in full size.

and

Click the image to open in full size.

You may want to notch a peak in the presence region.
The response is similar to the TB 1808, but with a bit more peak around 3khz.

For the money and the comments on the current paper cone, I believe they are excellent for the money, but I've not heard them.

Wild Burro Audio Labs - Fullrange Speakers - The Betsy & Betsy-K Drivers

Norman
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Old 11th June 2013, 05:12 PM   #3
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Thanks, I want to try out flat baffle first, is their a good general golden rule to follow with baffle size.

I have some scrap 18mm ply its 500mm x 1500mm, that I could experiment with.
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Old 20th June 2013, 02:47 PM   #4
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They are here. Thanks Douglas.

Is there a simple rule for calculating baffle size?
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Old 20th June 2013, 03:22 PM   #5
GM is offline GM  United States
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Well, until the baffle is an acoustical wave-length long at the desired low corner frequency it can't be too big. Unfortunately, most folk's listening room is < ~70 Hz wide, so one has to factor in the room's impact on its response, ergo not a simple calculation, though a leading authority offers some insight how to get a starting point: Electro-acoustic models.

GM
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Old 24th July 2013, 11:27 AM   #6
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Is there a combined source of Betsy box designs?
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Old 24th July 2013, 02:15 PM   #7
xrk971 is offline xrk971  United States
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The Betsy K works very well in a MLTL - see either the WIBAQ thread The WIBAQ: TABAQ Design with Betsy K or the AMLTL thread Accidental MLTL Technique.
The Betsy K has also been shown in sims to work very well in a Karslon K15 cabinet, see this thread: A Speaker that Kicks Butt in Large Spaces.
For smaller spaces and averge rooms, and placement near walls, use the MLTL design, for larger spaces and placement away from walls, the K15 works much better.
And if you like the combination of great deep bass extension of a ML-TQWT, but with the wide directivity of a Karlson-aperture, a 1.33X scale Karlsonator (40 in tall cabinet) is tough to beat. The frequency response, impedance, and cone displacement are below. This is with the speaker placed against a wall and measurement at 3 m away.
Attached Images
File Type: png Karlsonator-1.33X-BetsyK-Freq-3m.png (32.3 KB, 414 views)
File Type: png Karlsonator-1.33X-BetsyK-Impedance.png (26.3 KB, 415 views)
File Type: png Karlsonator-1.33X-BetsyK-Displacement.png (26.0 KB, 20 views)

Last edited by xrk971; 24th July 2013 at 02:18 PM.
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Old 25th July 2013, 08:39 AM   #8
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Thanks!

Anyone tried or seen these used in an omni speaker?

I have the regular Betsy's and not the K model, if that changes cabinet choices.
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Old 25th July 2013, 10:14 AM   #9
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an 8" is pretty directional past 2khz.

I remember my 1808 (with phase plug) was 2 people dispersion wide at 12'.

You could also go with a big ported (5ft3) tuned to 40hz.......................
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Old 25th July 2013, 12:35 PM   #10
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Using an 8 inch in a speaker with a Karlson coupler really improves the directivity and eliminates 'beaming' associated with larger full range drivers. Hence, the K15 or Karlsonator will not have this issue.
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