Wild Burrow Betsy L Speaker Design

[x3y3]

Wild Burrow Betsy "L" Speaker Design

This is my design of a very successful Betsy open-baffle speaker design. I used Maple 3/4" plywood and cork backing. It sounds fantastic! don

 

[x3y3]

I originally uploaded my design file in PDF, but evidently it did not go. This is a JPG version of the same file. don

 

[tansand]

Sweet! This is what I would do if I had the space for them!

 

[x3y3]

A short video ...... they sound great with only 5 hours break-in!

 

[nrstzwy]

Looking great, have you tried to directly wire speaker cables on the drivers? That makes a difference and is my preferred way for open baffle.

 

[x3y3]

I tested all combinations with an industrial megometer used for motor winding integrity before the final wiring you see. There is zero measurable difference to wire direct. Thank you for your interest, however.

 

[Old Timer 1950]

Looks super. I'm just starting a pair of OB Betsys. You've given me a lot to look at. Question... What size female disconnects will attach to the Betsys? Thanks!

 

[x3y3]

I am not sure what you mean by”disconnects”. But, assuming you mean RCA’s to the bottom speaker posts, , I used Sewell Deadbolt bananas with Mogami 3103 cable.

 

[x3y3]

Pics for you.

 

[x3y3]

Correction, I did not mean RCA’s. I meant speaker terminations. And, I got the speaker posts at Parts Express.

 

[x3y3]

Correction….the Sewell Deadbolts and Mogami 3103 cable came from Performance Audio.

 

[EdRadio]

Thanks! I like the Mogami cable. What I was inquiring about, and I didn't phrase it correctly, are the clips (female disconnects) that can attach to the + and - tabs on the speakers themselves. Someone thought it was a .205, another a .187. I'll have wiring from the amplifier coming into binding posts mounted on the rear of the baffle, then running from the inside binding post connections up to the speaker tabs. I'm trying to avoid buying a 'jumbo assortment' when I just need 4 of them! Thanks!

 

[adason]

Pics for you.

Any frequency response sweep?

 

[x3y3]

1/4” (6.3mm) is what I used:
Baomain 1/4 inch (6.3mm) Female Spade Quick Splice Crimp Terminals Crimp Connector Non Insulated Pack of 100
https://a.co/d/gZ4AD7y

 

[x3y3]

Or, just go to any hardware store and buy 1/4” female terminal crimps. ACE will have them in a 4-pack.

 

[x3y3]

But, you must solder them after “pinching” shut, and add small diameter heat shrink to the wires (be sure to cut and slide the heat shrink up the wire before you solder).

 

[Old Timer 1950]

Perfect. Thank you so much!

 

[x3y3]

I modified my original Betsy OB speaker with the addition of a 12" Eminence-A Woofer. This is the construction file. However, I would make 2 changes to it if anyone wants to replicate:
1) Make the Front panel "full length" such that it is effectively 3/4" longer covering the bottom board.
2) use "“Titebond Original” for sealing edges (Lowes) … “not Liquid Nails”
Please note that after building a similar OB with 15" Lii Song F15 speakers/drivers, and much listening, I must say that this Betsy with 12" woofer is much better in total sound.
If you have any questions or want to discuss, please call me at 505/603-7842. Don

 

[x3y3]

I attached the wrong file. Here is the Betsy/12" woofer plans.

 

[x3y3]

Here is a spectrum scan of the Betsy/12” woofer OB speakers.