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First Watt at RMAF
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Old 12th October 2008, 08:57 PM   #11
Nelson Pass is offline Nelson Pass  United States
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First Watt at RMAF
The speakers are product offered by Lowther America, and Jon
wished to show off the passive versions. I haven't heard them,
but I understand that they came out quite good.

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Old 13th October 2008, 02:00 AM   #12
BradJudy is offline BradJudy  United States
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There's a First Watt mention in the Enjoy the Music coverage (second item, showing the B1) - http://www.enjoythemusic.com/rmaf_2008/saturday/
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Old 16th October 2008, 06:21 PM   #13
Jon Ver Halen is offline Jon Ver Halen  United States
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Default The Crossover

Hi Folks:

Information will be added to my website about this speaker as a DIY. An article for EnjoyTheMusic.com's new DIY e-zine will be coming out shortly.

But in the meanwhile, I used a 52uf cap and a 12 mH coil as a single order, series crossover. This was a 16 ohm system, use 104uf and 6mH for an 8 ohm system.

By series crossover I mean:
Capacitor parallel with the woofer (Tone Tubby 12 Alnico 16 ohm)
Inductor parallel with the fullrange (Lowther PM6A, ticonal, 15 ohm, silver voice coil)
Amp to + of fullrange. - of fullrange to + of woofer. - of woofer to - of amp.

Baffle is 18" wide, 40" tall. Fullrange centered 9" from the top edge. Woofer is centered 9" from the bottom edge. Wings to each side are 12" at base, tapered with a 5 degree angle on the front and rear. Wings are 21" tall.

If this is not clear, just write and I will send a drawing & schematic to anyone who ask.

Jon at Lowther-America dot com You know how to correct this!
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Old 16th October 2008, 08:48 PM   #14
hifimaker is offline hifimaker  United States
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Any specs available for the Tone Tubby 12? The Tone Tubby website links to specs are broken.

-David
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Old 16th October 2008, 09:19 PM   #15
Babowana is offline Babowana  South Korea
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Default Re: The Crossover

Quote:
Originally posted by Jon Ver Halen

Hi Folks:

Information will be added to my website about this speaker as a DIY. An article for EnjoyTheMusic.com's new DIY e-zine will be coming out shortly.

But in the meanwhile, I used a 52uf cap and a 12 mH coil as a single order, series crossover. This was a 16 ohm system, use 104uf and 6mH for an 8 ohm system.

By series crossover I mean:
Capacitor parallel with the woofer (Tone Tubby 12 Alnico 16 ohm)
Inductor parallel with the fullrange (Lowther PM6A, ticonal, 15 ohm, silver voice coil)
Amp to + of fullrange. - of fullrange to + of woofer. - of woofer to - of amp.

Baffle is 18" wide, 40" tall. Fullrange centered 9" from the top edge. Woofer is centered 9" from the bottom edge. Wings to each side are 12" at base, tapered with a 5 degree angle on the front and rear. Wings are 21" tall.

If this is not clear, just write and I will send a drawing & schematic to anyone who ask.

Jon at Lowther-America dot com You know how to correct this!

Great, many thanks!
I will send you mail asking the drawing and schematic.

Cheers,

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Old 16th October 2008, 09:55 PM   #16
Zen Mod is offline Zen Mod  Serbia
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First Watt at RMAF
Default sketch for Babo

Quote:
Originally posted by Babowana

....

Attached Images
File Type: gif ob-series-vh.gif (7.2 KB, 1442 views)
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Old 16th October 2008, 10:18 PM   #17
Nelson Pass is offline Nelson Pass  United States
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I wasn't there for it, but by all accounts the Tone-Tubby version was
better than last year's display.

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Old 17th October 2008, 10:17 PM   #18
Babowana is offline Babowana  South Korea
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Default Re: sketch for Babo

Quote:
Originally posted by Zen Mod

Thanks, Zen Mode.
Your sketch gives me a clear illustrative picture.

Cheers,

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Old 21st October 2008, 02:40 AM   #19
Babowana is offline Babowana  South Korea
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Default Re: The Crossover

Quote:
Originally posted by Jon Ver Halen


Baffle is 18" wide, 40" tall. Fullrange centered 9" from the top edge. Woofer is centered 9" from the bottom edge. Wings to each side are 12" at base, tapered with a 5 degree angle on the front and rear. Wings are 21" tall.


Attached is my sketch of the open baffle based on yout kind input.
If my interpretation is correct, kindly forget my mail sent to you, asking your drawing and schematic.

Cheers,

Attached Images
File Type: jpg openbaffle.jpg (35.8 KB, 1044 views)
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Old 21st October 2008, 02:54 AM   #20
Jon Ver Halen is offline Jon Ver Halen  United States
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Default You are real close

Hi Bobowana:

Sorry, I never did get your e-mail, otherwise I would have replied by now. Your sketch is pretty good. The side wings have a 5 degree tilt to them, you have something a bit more than that. The offset at the top of the wing should be 43mm, you show it as 50mm.

Overall width is closer to 460mm. If I had to build it again, the driver would be slightly offset to one side. Right now it is the same distance from the center of the driver to each side and to the top. I would move it 25mm to one side, so that each of those distances is slightly different.

I used 18mm baltic birch for the initial trials. Then switched to 45mm thick maple. Maple did sound better, it is more rigid. Be sure to use spikes between the floor and the baffle, they help a lot.
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