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pjanda1 6th December 2009 09:50 PM

Driver Specs
1 Attachment(s)
Though I'd sure like you to visit my website, I figured I should toss a spec sheet up here. The BetsyK is V1, the redline, and the specs on the left. The other is the Betsy, as the Qts would indicate. Thanks to the forum updates I can post the full res jpg! It didn't fit last year when I introduced the drivers.

Wild Burro Audio Labs - DIY Full Range Speakers

pjanda1 7th December 2009 12:19 AM

1 Attachment(s)
I had a few drivers built with no whizzers. Right now they are special order, and those that are interested may want to check with Godzilla for info on his tweeter. Here is a comparative chart of the Betsy with and without a whizzer. Look at the specs: you can see that the plain dustcap weighs more than the normal whizzer! Also of note is the sensitivity difference between the two. Despite the whizzerless driver having a higher Mms and a correspondingly higher Qts, the computer figures it to be a more efficient driver! Thing's ain't always what the numbers would have you believe. . .

Wild Burro Audio Labs - DIY Full Range Speakers

godfrey 14th December 2009 12:24 PM

Hi Paul

I had a look at your website.

On the "speakers" page, it looks like you've got the colors mixed up in this piece of text: "Specs: V2 (red line) is the Betsy. V1 (blue line) is the BetsyK." Shouldn't that be "Specs: V2 (blue line) is the Betsy. V1 (red line) is the BetsyK." It's here: Wild Burro Audio Labs - Fullrange Speakers - The Betsy & Betsy-K Drivers

Also, I'm curious as to why the Betsy-K has much higher mechanical damping than the Betsy if the only difference is a stronger motor. Longer gap with ferrofluid maybe? Hmm - that would imply a bigger x-max too. You mention 2mm for Betsy, but I didn't see a spec for Betsy-K.

Regards - Godfrey

p.s. There - now you know somebody's at least paying attention ;)

godfrey 14th December 2009 12:34 PM

Hi again

What I'd really like to see in terms of specs are some off-axis response curves; maybe at 15 and 30 degrees. Any chance?

Cheers - Godfrey

pjanda1 14th December 2009 03:17 PM

You are right about the reversed colors/descriptions. I should really get to work on the website, but then what would we talk about? I would assume the Mms difference is due to an x-max difference. No ferrofluid here. I'll check in with the engineers when I get a chance. I'll also see about some off axis curves. No promises.

Wild Burro Audio Labs - DIY Full Range Speakers

Poultrygeist 15th December 2009 07:10 PM

hey Paul,

Wonder how the Betsy would sound with a phase plug?

pjanda1 16th December 2009 02:11 AM

I haven't tried phase plugs. I'm sure they would make a difference, but whether or not it is significant enough to be worth the trouble is probably a personal decision. I've got bigger fish to fry: more speaker projects, continued turntable work, and a never ending pile of new projects. (I picked up an Akai M8 tonight!). The whizzer and dustcap are connected, so anyone removing the dustcap should be careful!

Wild Burro Audio Labs - DIY Full Range Speakers

rickmcinnis 29th December 2009 11:21 PM

Voice coil former: paper or plastic?
Just curious.

There are some who prefer the sound of paper for the former.

Just thought I would ask.

Haven't forgot you.

pjanda1 11th January 2010 06:45 PM

I've been neglecting you guys for too long. The Betsy and BetsyK have different voice coils. The Betsy has a Kapton former. It has a little longer Xmax (shorter front plate) at 2.7 mm. The BetsyK has a Nomex form and a 1.9mm Xmax (I usually just say 2). It's larger magnet would saturate the thinner front plate. FWIW, nobody knows why we are using different formers. Perhaps some listening tests are in order . . .

Wild Burro Audio Labs - DIY Full Range Speakers

godfrey 27th January 2010 01:35 AM


Originally Posted by pjanda1 (
It's larger magnet would saturate the thinner front plate.

Is that bad? Wouldn't it have a similar effect to a shorting ring, but with distortion reduction all the way down to frequencies that shorting rings can't help?

I'm thinking if the plate's saturated, the flux won't be so strongly modulated by the VC current. :confused:

Then again, there didn't seem to be much interest in shorting rings anyway...

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