ScottMoose BVR for Betsy K - diyAudio
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Old 13th June 2013, 05:35 PM   #1
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Default ScottMoose BVR for Betsy K

I used some Betsy K drivers for a pair of speakers I built for a friend and now I've got to have some for myself. I'm interested in the double mouth BVR ScottMoose designed for them, but I'm not 100% sure of the dimensions, especially for the ports. What I got came from this post: Enclosure designs for Burro Speakers

Quote:
Originally Posted by pjanda1 View Post

And here are the specs ScottMoose sent me for a double mouth BVR:

Chamber internal HxWxD = 37in x 10.5in x 12.25in. Driver mounted centrally; suggest a couple of window braces at least. Back, one side & either the top or base of the chamber (making sure you don't block the throat) lined with 1in acoustic fiberglass or similar. Throats are 1in deep & 0.75in long. Each horn is 14.5in tall at the mouth; an angled strike-plate runs from the front of the box to 1.5in down / up (depending on which horn we're talking about) from the throats.
Here are some shots showing the dimensions in Sketchup and I attached the Sketchup model . If anyone (like ScottMoose ) could look this over and let me know if I got it right I'd really appreciate it.

Thanks in advance!
Attached Images
File Type: png BVR Detail.png (7.6 KB, 586 views)
File Type: png Betsy K BVR.png (11.5 KB, 604 views)
Attached Files
File Type: zip Betsy K BVR Sketchup.zip (73.2 KB, 23 views)

Last edited by thejessman; 13th June 2013 at 07:01 PM.
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Old 13th June 2013, 07:05 PM   #2
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Something happened to my original post, weird, anyway:

I used some Betsy K drivers for a pair of speakers I built for a friend and now I've got to have some for myself. I'm interested in the double mouth BVR ScottMoose designed for them, but I'm not 100% sure of the dimensions, especially for the ports. What I got came from this post: Enclosure designs for Burro Speakers

Quote:
Originally Posted by pjanda1 View Post

And here are the specs ScottMoose sent me for a double mouth BVR:

Chamber internal HxWxD = 37in x 10.5in x 12.25in. Driver mounted centrally; suggest a couple of window braces at least. Back, one side & either the top or base of the chamber (making sure you don't block the throat) lined with 1in acoustic fiberglass or similar. Throats are 1in deep & 0.75in long. Each horn is 14.5in tall at the mouth; an angled strike-plate runs from the front of the box to 1.5in down / up (depending on which horn we're talking about) from the throats.
Here are some shots showing the dimensions in Sketchup and I attached the Sketchup model . If anyone (like ScottMoose ) could look this over and let me know if I got it right I'd really appreciate it.

Thanks in advance!
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Old 16th June 2013, 05:14 PM   #3
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Anyone?
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Old 16th June 2013, 06:26 PM   #4
xrk971 is online now xrk971  United States
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Based on written description, it sounds like you have the drawing right. Of course, Scottmoose should be the final word. This would be a pretty straightforward speaker to model in Akabak. Very big speaker.
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Old 16th June 2013, 08:10 PM   #5
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Thanks, I need to learn how to use Akabak one of these days, I feel like I have a good handle of Hornresp, just haven't taken the leap to figure out Akabak yet.
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Old 17th June 2013, 07:53 PM   #6
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Just an idea, TABAQ GIANT
Attached Files
File Type: pdf BetsyK simulation TABAQ style.pdf (198.0 KB, 77 views)
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Old 17th June 2013, 08:03 PM   #7
freddi is offline freddi  United States
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BetsyK will work pretty well in a Karlson 12" coupler. It will play loud enough to burn out - but not from over excursion..
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Old 17th June 2013, 08:32 PM   #8
xrk971 is online now xrk971  United States
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My sims show that Betsy K will sound good in an original K15 too.
This is 3 meters away with 1 watt input.
Click the image to open in full size.

Details on simulation here: KARLSON
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Old 17th June 2013, 08:34 PM   #9
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by Bjohannesen View Post
Just an idea, TABAQ GIANT
+1. The WIBAQ is easy to build and the builder says it works very well with bass down to 30 Hz.

Click the image to open in full size.
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Old 17th June 2013, 09:29 PM   #10
xrk971 is online now xrk971  United States
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Default Sim of Betsy BVR

Here is an AkAbak model of the BVR as drawn above. This is for the speaker 60 in away from a back wall and measurements at 3 m away at speaker centerline with 1 watt input.

The simulations show that the bass peaks at about 80 Hz and softly rolls off below that. If you are looking for deep bass, I am not sure if this will work. Also there appears to be a dip at 140 Hz and 240 Hz and sharp spike at 380 Hz. I may have done something wrong with the model, but this is a pretty straight forward design with only 11 nodes and two horns.
Attached Images
File Type: png BetsyK-BVR-Freq-Resp-3m.png (37.3 KB, 396 views)
File Type: png BetsyK-BVR-Imped-3m.png (28.8 KB, 41 views)
File Type: png BetsyK-BVR-Displ.png (27.3 KB, 23 views)
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