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Old 4th April 2013, 12:05 PM   #11
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Same question as before: what 8in driver, or range of parameters? They cover a rather broad range, and I don't believe that you'd suggest that it would produce identical results, irrespective of the driver.
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Old 4th April 2013, 01:43 PM   #12
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Quote:
Originally Posted by Scottmoose View Post
Same question as before: what 8in driver, or range of parameters? They cover a rather broad range, and I don't believe that you'd suggest that it would produce identical results, irrespective of the driver.
This is design for diy and you can tweak box for your drivers if you want to build it.
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Old 4th April 2013, 02:27 PM   #13
ATAUDIO is offline ATAUDIO  Austria
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Hi Apex, nice DIY ideas, as usual, thanks.

What about to try such design with an Aura NS6 ?That drive had in the recent past many DIY uses.
Or with that unnamed Celestion 5" Neo (Celestion 5" on sale at PE..) that is on sale at Parts Express? They are both (expecially the Celestion) quite full-ranges, low Xmax.
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Last edited by ATAUDIO; 4th April 2013 at 02:32 PM.
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Old 4th April 2013, 03:51 PM   #14
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Quote:
Originally Posted by ATAUDIO View Post
Hi Apex, nice DIY ideas, as usual, thanks.

What about to try such design with an Aura NS6 ?That drive had in the recent past many DIY uses.
Or with that unnamed Celestion 5" Neo (Celestion 5" on sale at PE..) that is on sale at Parts Express? They are both (expecially the Celestion) quite full-ranges, low Xmax.
Try with KEF B110
B110 Type SP1003 Index hifiloudspeakers.info
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Old 11th April 2013, 06:36 PM   #15
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TQWT with port on rear side.
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Old 12th April 2013, 02:20 PM   #16
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TQWT in 3D
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Old 4th August 2013, 04:55 PM   #17
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what is the board thickness? I cannot calculate it from this diameter chain...


seems to be 10 mm but (375-90-100-70-70)/5 gives 9mm
something is wrong on the picture, mr Apex.

Last edited by adamkaktus; 4th August 2013 at 05:03 PM.
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Old 19th November 2014, 10:46 AM   #18
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Default TQWT few question

Hi Mile, I ve started to look around this type of cabinet. If I understand right TQWT should be tappered in opposite direction to this shown on your drawing. I'd like to mount 6,5 " driver in similar construction, but lenght of TL should be for about 36HZ(FS) what gives more than 2m and more width and height on front panel.. As we can see on your drawing, you tuned this cabinet for about 70 Hz ( nearly 1,7 meter), but you didn't mentioned that it shouldn't be damped with wool because wool slows down air in this line, what virtually enlarges it. Can you comment this if i'm right?
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Old 19th November 2014, 11:47 AM   #19
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Wrong on basically all points unfortunately.

TQWT is currently [mis]used to describe conical horns that are compromised in cross section, i.e. a pipe that expands toward the terminus. Traditionally, it was used to describe the opposite, i.e. a pipe that narrows toward the terminus, although very few people use the term in that way these days (GM, myself & presumably the OP here also, but that seems to be about it).

The acoustic length of a pipe is a function of both physical length and its taper: a pipe narrowing toward the terminus is inherently mass-loaded, and has a lower fundamental resonance frequency to an untapered pipe of the same physical length. Conversely, a pipe that expands toward the terminus is a horn, and has a higher resonant frequency than a straight pipe of the same physical length: Resonances of open air columns

Wool stuffing does not significantly slow the speed of sound in a pipe:
http://www.quarter-wave.com/TLs/Test_Line_Results.pdf
http://www.quarter-wave.com/TLs/Damping_Coefficient.pdf

There is a little attenuation, but not to the extent often cited. Tapering the pipe will typically have a much more significant impact on the fundamental resonant frequency.
TLs of any kind are like any other vented box: they require the box tuning frequency and volume to be optimised for the requirements of the driver and the desired alignment.
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Last edited by Scottmoose; 19th November 2014 at 11:50 AM.
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Old 19th November 2014, 12:13 PM   #20
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by adamkaktus View Post
what is the board thickness? I cannot calculate it from this diameter chain...


seems to be 10 mm but (375-90-100-70-70)/5 gives 9mm
something is wrong on the picture, mr Apex.
It could be that the 375mm refers to the internal distance not including the front and back. So boards would be 15mm. It won't matter much from tuning standpoint or performance standpoint whether or not the overal depth is 375mm or 385mm.
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