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-   -   Wild Burro Betsy OB Build (http://www.diyaudio.com/forums/full-range/226602-wild-burro-betsy-ob-build.html)

danvprod 29th December 2012 12:47 AM

Wild Burro Betsy OB Build
 
I'm taking my first crack at an open baffle speaker design build. I've built a couple of speakers in the past, mostly *boring* 2-way ported low-efficency towers and such -- but have been recently bitten by the low-wattage SET amp bug and cross-overless, boxless speaker bug...

I stumbled on the Wild Burro Betsy, and they are intriguing to say the least.

I figured for my first build, I'd stick with Paul's design and experiment from there (hey -- I can always use the OBs for shelves later if I don't like them ;)--).

So for my build I've decided on some stain grade laminated pine panels that I found at Lowe's. Sadly, no access to a wood shop anymore...

The total Lowe's trip was $136 -- the wood was a bit expensive but it will look nice when done, I think.

The main panel with the speaker is 12" x 48". The outside panels are also 12" x 48". The inside panels are 16" x 48".

I did splurge for the 48" piano hinges.

I made some good progress today -- using a rotozip, I cut out the 7 3/8" hole for the driver 26" up on the panels.

For finishing, I am keeping it simple, using clear shellac.

Front panels after cutting out the driver holes:
https://lh6.googleusercontent.com/-B...0/IMG_0594.JPG

First coat of shellac on the fronts:
https://lh3.googleusercontent.com/-5...0/IMG_0595.JPG

I'm very excited about this build, and if all that I have read about the Betsy drivers, OB midrange and soundstage detail are true, I have a lot to look forward to for these!

I'll update this post as I complete the build and will take measurements in my listening room.

I still have to decide on a complete audio chain. Right now I am leaning towards the following:

Mac Mini --> USB Halide Design Dac HD --> Bottlehead SET or Decware Super Zen Triode --> DIY Betsy OBs.

Would love your thoughts/suggestions on the build.

Urchinn 29th December 2012 01:39 AM

Can't wait to hear your critique on these OB's!

danvprod 29th December 2012 02:22 PM

Me too!! Should have the cabinets built up today. Have a couple of more coats of lacquer to get on there and then attach the hinges.

Going to try and find cork placements to put on the back baffles.

zimmer64 29th December 2012 03:58 PM

As I also just ordered Betsy's I am also very interested in your experience! You are using slightly different baffle size than suggested at Paul's web site. Any reason for that?

Mike

danvprod 29th December 2012 04:43 PM

Hi Mike --

I changed up the baffle size because that is what Lowe's had for wood. Paul said that a few inches here or there won't matter and bigger should be better, right? I'm not sure -- we will have to see.

Dan

cervelorider 29th December 2012 04:50 PM

I think they look fantastic! I have the Burro Betsy and Betsy K.... You're in for a real treat.
Great baffle choice. I've built a pair of piano hinged, winged baffles and it is my favorite of all the different ones I've built over the years. So much flexibility. You'll observe quickly how baffle width impacts bass and changes the imaging.

Your audio chain plans look great. The Bottlehead Stereomour 2A3 would be enough power. The Decware is great too. (I owned one for years)
I'm using a Class D amplifier with mine and the sound is stunning. It's all a matter of different flavors.
Great job and way to jump in!

cervelorider 29th December 2012 05:23 PM

Quote:

Originally Posted by danvprod (Post 3303216)
Hi Mike --

I changed up the baffle size because that is what Lowe's had for wood. Paul said that a few inches here or there won't matter and bigger should be better, right? I'm not sure -- we will have to see.

Dan

Paul is correct. You'll discover quickly that placement in the room and wing positioning will affect the sound WAY more than a few inches in baffle dimension variance.

danvprod 29th December 2012 06:27 PM

Quote:

Originally Posted by cervelorider (Post 3303256)
Paul is correct. You'll discover quickly that placement in the room and wing positioning will affect the sound WAY more than a few inches in baffle dimension variance.

Very cool --

That is what I was thinking as well. I may experiment with some absorption materials as well.

I found some rolls of adhesive-backed cork at target this morning, which I will laminate to the back of the baffles.

I may also experiment with some of the adhesive-backed duct liner that is made from recycled cotton:
Recycled Cotton Acoustical Liner ? HVAC ? Multipurpose

Now my Betsys just need to get here!!

Off to put another coat of shellac on the backs and attach the hinges. I'll post some pics later this evening.

danvprod 30th December 2012 08:35 PM

Made some good progress on the build:

There are a LOT of screws needed on those piano hinges...

https://lh5.googleusercontent.com/-9...2/IMG_0602.JPG

And set up in their listening location --
https://picasaweb.google.com/danvpro...51930004090818

I did find out that there is a slight setback in that Paul had sold out of the regular betsy drivers right as I was paying for them -- so I am going to try with a pair of BestyKs with some series resistance.

I did see this thread --
http://www.diyaudio.com/forums/wild-...er-been-8.html

Which suggests a 25-ohm series resistor, but that seems a bit high to me...

xrk971 30th December 2012 09:29 PM

Looks very nice. This material reminds me of Pergo synthetic wood floor boards. I wonder if those can be used for open baffle?
Would be very economical as they come in bulk.


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