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Old 17th June 2005, 10:24 AM   #1
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Default Innovative OB/TL design

It's not too often I see a design and think that it's innovative but I just saw a speaker here (look for the Trapezoid) that got my interest.

I use an open baffle with TL bass myself but the TL subs are much larger. I wondered how they can get bass down to 25 Hz from a 12 inch (30 cm) diameter tube just 33 inches (85 cm) high?

If this works then I'll be after some Sonotubes myself!
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Old 17th June 2005, 05:47 PM   #2
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Nuuk,

It doesn't say flat to 25hz, just down to 25hz. The TL using a 33"L by 12" dia pvc pipe seems like a single fold TL to me. With a 24"W x 20"D footprint I think it would be easy to go fully dipole with larger driver(s) or use a U baffle for the bass and exceed the performance they claim in a much nicer looking package and a smaller footprint.
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Old 17th June 2005, 07:11 PM   #3
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Quote:
With a 24"W x 20"D footprint I think it would be easy to go fully dipole with larger driver(s) or use a U baffle for the bass and exceed the performance they claim in a much nicer looking package and a smaller footprint.
Yes, I suppose if I want to be rid of my TL 'monsters' there are other solutions like the U baffle woofers or even a W baffle. I was just interested in the TL solution as it was more compact than mine.

I also thought it quite a large baffe if it only has to go down to 150 Hz!
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Old 17th June 2005, 07:38 PM   #4
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Quote:
Originally posted by Nuuk


Yes, I suppose if I want to be rid of my TL 'monsters' there are other solutions like the U baffle woofers or even a W baffle. I was just interested in the TL solution as it was more compact than mine.

I also thought it quite a large baffe if it only has to go down to 150 Hz!
It seems that the baffle's primary purpose is to hide the 12" diameter PVC pipe in the back. You could use the same drivers and fit a boxed TL in a much more compact form. I'd rather see the woofer on the front to break up the look of that wall of a baffle unless having it up firing serves some benefit.
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Old 17th June 2005, 07:39 PM   #5
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What coincident driver do they use in the Trapezoid?
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Old 17th June 2005, 08:16 PM   #6
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Quote:
You could use the same drivers and fit a boxed TL in a much more compact form.
I didn't manage it! But I did have my bass driver firing through the main baffle and the aperture actually improved the look of the baffle!
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Old 17th June 2005, 10:41 PM   #7
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Quote:
Originally posted by Nuuk
I didn't manage it! But I did have my bass driver firing through the main baffle and the aperture actually improved the look of the baffle!
I bet yours produces a lot more bass than their little 10" in a short line.
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Old 18th June 2005, 01:35 AM   #8
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Quote:
Originally posted by Nuuk
I also thought it quite a large baffe if it only has to go down to 150 Hz!
150?
They say 250hz, but that's with the third-order crossover.

Quote:
Originally posted by audiobomber
What coincident driver do they use in the Trapezoid?
By the looks it's a Seas coax.
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