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Wild Burro Audio DIY full range speakers from Wild Burro Audio Labs

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Old 30th May 2010, 07:23 PM   #61
pjanda1 is offline pjanda1  United States
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Remember that you need that too much damping (too low a Qts) is too little bass. Too much is too boomy. 4 ohms might be more than you need. I haven't run the numbers, but a couple of ohms may get your peak down. Still, an underdamped peak would more likely be up around 100-150hz.

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Old 30th May 2010, 07:26 PM   #62
Tea-Bag is offline Tea-Bag  United States
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That's a cool looking speaker. Two channels in one. Sweet idea! Probably perfect for a smaller listening area.
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Old 30th May 2010, 09:58 PM   #63
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Hey thanks Tbag, I was surprised by just how darn good it looks. I was a perfectionist when building but now I realize there's not much I could do to make it look bad. I was worried about the speakers being so low. I wanted to put them higher but decided against it.

I was sort of worried about the stereo separation. I would have made the whole thing larger if my room wasn't so small. I haven't tried putting damping behind the speakers yet. I was thinking of stretching a couple layers of soft towels over the back of them. With my head near the back of the baffle next to the wall, I can detect a few small peaks when doing a frequency sweep.

Actually the bass still seems a little minimal, but perhaps it only seems that way since the bass no longer distorts so badly and I'm used to my old speakers.

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Old 30th May 2010, 10:55 PM   #64
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The response is actually amazingly flat compared to my old speakers. I've been doing some more controlled tests and I think what I detect for the treble and highs is resonance and reflections and phase stuff from my small room. I don't think there is much difference at all for pure response.

The bass begins to become audible at 52Hz. You are right, any peaking is somewhere around 120Hz, but it seems more like a phase difference between the sides of my head than anything (I sit at a right angle to the speakers on my computer...). The rectification frequency in any amp is at precisely this frequency, so the amp may have some affect too. (wait, I think my car amp uses a switching supply...)

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Old 30th May 2010, 11:42 PM   #65
adason is offline adason  United States
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this fr response is what I got on betsy-wow
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Old 2nd June 2010, 03:21 AM   #66
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Is this strange?

As I increase the series resistor, the response around 174Hz dips, instead of peaking. This is a spread out dip, between C3 and C4 (130Hz to 261Hz). This has the effect of seeming to drain the life out of music if it's strong with a large series resistor, since it cuts out the lower midrange. From here it gets louder rather steadily with increasing frequency. Shouldn't the response peak instead of dip?

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Old 6th June 2010, 09:41 PM   #67
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I'm not sure what to do now:

Was expecting low QTS suitable for Karlson loaded project...
Might have received open baffle Betsy (without the K)?
Its a nice speaker. Can still use for something, I suppose...
Just maybe not for same plan as I had originally posted.

Sais "Betsy" on both the box and the magnet...
And QTS measures 0.8 as-if optimized for an open baffle.

Kean said something about adding a series resistor before
his open baffle sounded right? Maybe he got my low QTS
K's? They were both ordered and paid on the same check.

Kean, what yours say on the magnet? Was there a sticker?

This was after about 10 min breakin at very low volume...
Just using WT3 tester itself to play some music in Mono.
Measurements made in fee air (very hot and humid), and
with 20g non-magnetic weight added (4 US Nickle coins).
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Last edited by kenpeter; 6th June 2010 at 09:48 PM.
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Old 7th June 2010, 01:08 AM   #68
freddi is offline freddi  United States
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BetsyK should have the double thick magnet
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Old 7th June 2010, 01:16 AM   #69
tinitus is offline tinitus  Europe
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The Betsy OB driver has ventilated poleplate, the Betsy-K hasnt
Its very easy to see which is which
sometimes we know very little, and sometimes we know too much
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Old 7th June 2010, 05:43 AM   #70
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I got OB Betsy with thin magnet, bumped back plate, and vent hole.
Fairly sure of it now... Though I still wonder which type Kean got?
Can't fathom Kean's preference for series resistor if his OB Betsy has
the same curves as what I just measured? If BetsyK, would explain.
I suspect shipments (I ordered and paid for both) got wires crossed.

Not certain I can use 0.8Qts for my 3rdK12 project? Unless I don't
use fullrange, but cross down to 1955RE Karlson K15 (overstuffed
with SigmaPro18) at some frequency well above Betsy's Q peak.

Even then, I doubt 90db sensitivity is useful matched against 97db.
How much could I boost Betsy's effective sensitivity, tightly cupping
the back? I mean, if I was to intentionally cut off all the low end and
send Fs and Q skyrocketing, but cross to 18 well above that mess...

Compare Alpha-8 against Alpha-8MRA, I think the closed basket is the
only major difference? But the sensitivity went way up as the low end
of useful bandwidth got whacked... Would it be the same on Betsy?

Last edited by kenpeter; 7th June 2010 at 06:07 AM.
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