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16 Hz 18" TL enclosure design
16 Hz 18" TL enclosure design
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Old 30th March 2018, 10:07 PM   #11
Brian Steele is offline Brian Steele  Grenada
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The Dayton PA460 doesn't seem like a good match for a 16 Hz TL. The specs suggest that it will be a lot happier in a box tuned to around 38 Hz, and its limited Xmax is going to impact SPL capability at low frequencies anyway.

Specs you need to look for:

1. Fs around 16 Hz
2. Qts around 0.4
3. Xmax fairly high (12mm or above)
4. Low Le

16 Hz is going to be quite a challenge, and frankly I like the idea of going sealed with EQ and lots of drivers, rather than a higher-order system, to achieve it.

If you're set on a TL, the Dayton RSS460 (not the PA460 - that's a completely different driver), might do it, or at least get close.
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Old 30th March 2018, 10:15 PM   #12
planet10 is offline planet10  Canada
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16 Hz 18" TL enclosure design
Quote:
but did something wrong and the end result was not correct in line length or port area for some reason
From the info provided you are using next to useless Classic design techniques (for instance, cone area has nothing to do with proper design, and you are not taking advantage of driver offset are 2 clues).

With classic design you might luck onto an optimal design 10% of the time.

Time to forget everything you think you know and start reading. Start here Quarter Wavelength Loudspeaker Design

dave
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Old 30th March 2018, 10:45 PM   #13
MemX is offline MemX  United Kingdom
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Are the Stereo Integrity HT-18 still available for c. $160?

Could multiples of those be an option?
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Old 30th March 2018, 10:47 PM   #14
planet10 is offline planet10  Canada
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16 Hz 18" TL enclosure design
That might work. Box is going to be huge. One needs to plug the driver into a modeler and play.

dave
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Old 31st March 2018, 02:38 AM   #15
Etocynned is offline Etocynned
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It needs to fit through 30" doorways. Is it supposed to be portable?

Perhaps something in a tapped taper that can absorb lots of power. Shorter for bass extension and just dump a few kw into it.

Pipe organ tones are near enough sinusoidal and im guessing group delay wont be an issue.
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Old 31st March 2018, 02:40 AM   #16
Etocynned is offline Etocynned
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The HT-18 doesnt exist...the HST-18 does but its nearer 700. Still...huge xmax and over 1 kw power handling.
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Old 2nd April 2018, 09:38 AM   #17
bentoronto is offline bentoronto  Canada
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16 Hz 18" TL enclosure design
Quote:
Originally Posted by Brian Steele View Post
Specs you need to look for:

1. Fs around 16 Hz
Does a Voigt pipe or TL lower driver resonance compared to free-air?

I think OP - who builds organs - is thinking of organ pipes and historic (and wonderful) TL boxes (like the Voigt that I'm also working on now). That is different than the "modern" TL theory that planet10 endorses (including concern about offsets) which is a kind of mass-loaded BR hiding in the folds. That is not a criticism of planet10, just pointing out a difference.

B.
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Last edited by bentoronto; 2nd April 2018 at 09:41 AM.
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Old 2nd April 2018, 12:09 PM   #18
Brian Steele is offline Brian Steele  Grenada
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Quote:
Originally Posted by bentoronto View Post
I think OP - who builds organs - is thinking of organ pipes and historic (and wonderful) TL boxes (like the Vogt that I'm also working on now). That is different than the "modern" TL theory that planet10 endorses (including concern about offsets) which is a kind of mass-loaded BR hiding in the folds. That is not a criticism of planet10, just pointing out a difference.
The Voight Pipe alignment includes the use of an offset, and for the same reason that it's used in "modern" TL design.
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Old 2nd April 2018, 04:27 PM   #19
chris661 is offline chris661  United Kingdom
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Quote:
Originally Posted by bentoronto View Post
Does a Vogt pipe or TL lower driver resonance compared to free-air?
... Makes no sense.
Fs is inherent to the driver.

You can tune a TL/Voigt pipe/whatever to whatever frequency you choose. The T/S parameters of the driver(s) in question will determine the frequency response.

Chris
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Old 2nd April 2018, 04:45 PM   #20
kiaya611 is offline kiaya611  United States
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Default Voigt Pipe/TL Question

I haven't been able to see detailed plans for the "pipe" design...Does it need to have baffles like a standard TL enclosure? Also, does the pipe have to be straight, or can it have curves/"Us" in it? I am asking because one picture that I saw was clearly about 12' tall and this has to fit under an 8' ceiling and fit through a normal inside door (30"). I almost forgot, most pipe designs use 2 drivers, is that part of that style of enclosure, or can you use a single driver? Thank you, Steven
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