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

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Old 19th September 2012, 05:04 AM   #21
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Works for me!

I use 1" acoustic fiberglass, but if you're satisfied with the foam's performance, then use it.

GM
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Old 19th September 2012, 02:03 PM   #22
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It's not modeled for any TL effects (a bit short perhaps). Driver is on the vertical CL and is centered perhaps 8 to 10 inches from the top. It's a wide baffle, shallow depth design similar to the Poor Man's Stradivarius.
I like the port to be about 6 inch from the bottom, but shouldn't be too critical. Straight BR.

I again emphasize that this is based on measured parameters from my 2010 dated BetsyK's. They were run in for about 24 hours before the final measurements.

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Originally Posted by opa1 View Post
On the 61 l, what is the driver and port placement? Any offset of driver?
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Old 20th September 2012, 03:56 AM   #23
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I have the green 2009 and 2012 set. I dont know how much they differ, if any.

Your Br would work good too. Might try them next.

I really dont want to use stands. The towers have the 36" Zd where I need it. Plus they dont take up much room.

Thanks,
Mark
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Old 20th September 2012, 01:04 PM   #24
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My 2010 are greenish as well. You can always build the box a bit taller and put a false bottom in. I often either mount a crossover in the bottom or add ballast.

Here are the average measurements after 24 hours of break in:
Re = 5.8079 ohms
Fs = 49.8064 Hz
Zmax = 35.7954 ohms
Qes = 0.5695
Qms = 2.9404
Qts = 0.4771
Le = 0.4154 mH (at 1 kHz)
Diam = 168.2750 mm ( 6.6250 in )
Sd =22239.7074 mm^2( 34.4716 in^2)
Vas = 66.5831 L ( 2.3514 ft^3)
BL = 5.8642 N/A
Mms = 10.7753 g
Cms = 947.6355 uM/N
Kms = 1055.2581 N/M
Rms = 1.1468 R mechanical
Efficiency = 1.3573 %
Sensitivity= 93.3448 dB @1W/1m
Sensitivity= 94.7355 dB @2.83Vrms/1m
Krm = 1.089E-03 ohms Freq dependent resistance
Erm = 804.593E-03 Rem=Krm*(2*pi*f)^Erm
Kxm = 15.047E-03 Henries Freq dependent reactance
Exm = 609.473E-03 Xem=Kxm*(2*pi*f)^Exm

BTW, while I haven't put them in a box yet, they do sound pretty appealing just sitting in free air.

Quote:
Originally Posted by opa1 View Post
I have the green 2009 and 2012 set. I dont know how much they differ, if any.

Your Br would work good too. Might try them next.

I really dont want to use stands. The towers have the 36" Zd where I need it. Plus they dont take up much room.

Thanks,
Mark
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Last edited by fastbike1; 20th September 2012 at 01:09 PM.
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Old 20th September 2012, 03:47 PM   #25
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Thanks!

FWIW, placing the driver at MJKs [L*0.349] works well enough and vents tend to work best overall at around [L*0.8].

Plugging your numbers into the MLTLs Ive posted show barely discernible differences in a sim, so are good to go as is, though of course some vent tuning is often required to get the best overall in room response same as any vented alignment.

GM
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Old 20th September 2012, 05:02 PM   #26
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'I often either mount a crossover in the bottom or add ballast.'
Thats a good idea. I going to add a larger base on the tower for better footing. I could add ballast too.

Thanks for the measurements.

Mark
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Old 21st September 2012, 04:40 PM   #27
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Good to know. Thanks for the info / ROT. I confess that I've paid for Martin's
worksheets several years ago but haven't spent any time really looking into them. Even have Mathcad.

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Originally Posted by GM View Post
Thanks!

FWIW, placing the driver at MJKs [L*0.349] works well enough and vents tend to work best overall at around [L*0.8].

Plugging your numbers into the MLTLs Ive posted show barely discernible differences in a sim, so are good to go as is, though of course some vent tuning is often required to get the best overall in room response same as any vented alignment.

GM
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Old 21st September 2012, 08:08 PM   #28
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Going to get materials tomorrow. I'm painting them black so I'll be using mdf. I should have a flatpac by afternoon.
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Old 22nd September 2012, 11:58 AM   #29
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Quote:
Originally Posted by fastbike1 View Post
Thanks for the info / ROT.
You're welcome! BTW, what 'fast bike' do you ride?

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Old 22nd September 2012, 12:17 PM   #30
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Currently a 2008 Triumph Tiger. 2003 Ducati Monster before that. I got the nickname in '95 when I would occasionally ride with a local Harley Owners Group. Had a 95 Ducati Monster then. First ride with the group, we were merging onto the interstate and I hit it to get up to speed. Unbeknown to me, behind me was a guy w/ a rep for a fast Harley and he was way way behind. After that, the group took to calling me Fastbike. Worked for me.

46 years of riding this year.


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You're welcome! BTW, what 'fast bike' do you ride?

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