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Old 18th August 2020, 10:12 AM   #11001
woodo is offline woodo  Australia
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Default modelling a TQWT from the 90s using a Triangle T17FL2 8 inch driver

Hi
I tried modelling the attached TQWT but the output looks questionable compared to other sims I have seen leading me to think I've entered wrong areas at different parts of the line. Can the good folk spot where I may have gone wrong? Please let me know if this is a question for a different forum of course. I am uncertain of the inductance value of the Triangle T17FL2 driver which may be an issue but the value of .18 mH was on a french catalogue of T/S parameters for the unit. Seems low though.
Attached Images
File Type: jpg HR-TQWT Triangle-a.jpg (88.0 KB, 203 views)
File Type: jpg HR-TQWT-triangle-b.jpg (62.4 KB, 199 views)
File Type: jpg HR-TQWT-triangle-c.jpg (79.8 KB, 194 views)
File Type: jpg HR-TQWT-triangle-d.jpg (56.0 KB, 194 views)
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Old 18th August 2020, 10:17 AM   #11002
Booger weldz is offline Booger weldz  United States
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Woodoo, look at the Vas. Kinda large it seems.

Try a 600-650cm2 CSA Offset driver TL at a 55-65cm Length to driver and 120cm from there to exit?

Last edited by Booger weldz; 18th August 2020 at 10:38 AM.
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Old 18th August 2020, 10:44 AM   #11003
woodo is offline woodo  Australia
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thanks Booger, will have a look. the Vas of the driver is rated at 40L. it does seem high.
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Old 18th August 2020, 03:03 PM   #11004
Greebster is offline Greebster  United States
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This may help... DIY Audio Projects Forum • "Hazard" wide band speaker load
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Old 18th August 2020, 09:16 PM   #11005
woodo is offline woodo  Australia
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Thanks, same guy's speaker. Was interested in how to model the TQWT which I am having trouble getting a sensible output. I see a figure for the inductance though which I wasnt sure about.
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Old 19th August 2020, 04:35 AM   #11006
GM is offline GM  United States
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Quote:
Originally Posted by woodo View Post
Hi
I tried modelling the attached TQWT but the output looks questionable.....
Greets!

My HR inputs are close to yours except using the base specs and yes, without factoring in driver/vent delay [Chamber/Path] to the listening position [Lp], stuffing impact [Filling] makes for a pretty pathetic looking sim.

That said, this one is barely > Vas, so at minimum a bit small and more so if significant series resistance [Rg] and/or stuffing to smooth it out isn't factored in.

If seated ear height is much different than ~31", consider making the pipe based on yours and use the Wizard to try different net volumes [Vb].

For instance, a T/S max flat alignment is ~100.28 L/44.6 Hz Fb, so ~2.5x larger, tuned slightly lower and depending on the room's acoustics, could be tuned as low as ~0.707x Fs = ~41 Hz.

Some have pushed drivers [much] lower, but power response 'drops like a stone' [excursion increases 4x/octave], so 'caveat emptor' applies big time with a tiny Xmax driver.

GM
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File Type: txt T17FL2_8_Voigt.txt (1.1 KB, 7 views)
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Old 19th August 2020, 04:58 AM   #11007
woodo is offline woodo  Australia
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@GM and others. Thanks for your analysis. Will play further based on your recommendations.
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Old 19th August 2020, 05:03 AM   #11008
GM is offline GM  United States
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Quote:
Originally Posted by woodo View Post
I see a figure for the inductance though which I wasnt sure about.
I used 1.0, but this spec will probably be less, so has little impact on its HF response.

GM
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Old 19th August 2020, 05:06 AM   #11009
GM is offline GM  United States
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~T/S max flat sim based on my ~39" ear height.........

GM
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File Type: txt T17FL2_8_Voigt2.txt (1.1 KB, 12 views)
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Old 21st August 2020, 09:52 PM   #11010
olsond3 is offline olsond3  United States
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Where is the official download site for hornresp?
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