T-TQWT design - Vifa 10" - diyAudio
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Old 8th January 2013, 09:16 PM   #1
Jamii is offline Jamii  Australia
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Default T-TQWT design - Vifa 10"

Hi DIY,

Looking for some help with a T-TQWT design for my Vifa 10" subwoofer, it is a car woofer (high Qts?) so hopefully It can be suitable. Specs as follows;

Vifa 10" Subwoofer Cat No. CS-2351
Power handling:200WRMS
Nominal impedance: 2 x 4 ohms
Frequency response: 30Hz - 1kHz
Sensitivity: 86.6dB SPL @1W, 1m
Re: 3.6 ohms
Qms: 6.13
Qes: 0.83
Qts: 0.73
Vas: 42.8 litres
Fs: 38.6Hz

I'm looking for a single fold design, size constraints only by the size limits of a sheet of Ply 2400x1200 (more than 1 sheet if need be)

I've had a play with hornresp but so far baffled on how to set it up for a T-TQWT.

Going to use a sub to augment my Cury Changs, I'm having to use too much EQ to get the sub bass level I'm after and obviously that's likely to be degrading sound quality.

See attached for a picture if you're curious.

Regards,
James
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Old 9th January 2013, 03:33 AM   #2
Jamii is offline Jamii  Australia
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The "Bjorno" style box is the one I'm looking to make, will anyone volunteer to help with Hornresp please
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Old 9th January 2013, 02:51 PM   #3
GM is offline GM  United States
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Greets!

Well, you could input one of bjorno’s designs into HR, then use the Loudspeaker Wizard to ‘slide’ your way into an acceptable design based on whatever will fit on a sheet of plywood. I’m guessing you’ll need several folds to get a long enough path-length to fit since the driver’s specs indicate a ~20 Hz tuning.

GM
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Last edited by GM; 9th January 2013 at 02:54 PM.
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Old 9th January 2013, 08:36 PM   #4
Jamii is offline Jamii  Australia
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That sounds like a good idea, would you have a .txt file for the design? I'll try a thread search as well. ~20hz tuning would be good, hopefully get a reasonable amount of SPL too!

Thanks for the input.

James
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Old 9th January 2013, 09:31 PM   #5
bjorno is offline bjorno  Sweden
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Hi,

FYI: No Assurance can be given for these suggestions. Properly TS should inputted into HR, use the input screens as templates when correct numbers are found:

b
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Old 9th January 2013, 10:06 PM   #6
Jamii is offline Jamii  Australia
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Thanks very much mate, that is exactly what I needed! Now to chase down or measure the correct TS parameters. Champion!

James
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Old 9th January 2013, 10:40 PM   #7
bjorno is offline bjorno  Sweden
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Forgot to post a suggestion that matches Post#2: 2 Drivers are a minimum for a T-QWP using the posted T/S parameters.

b
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Old 9th January 2013, 11:00 PM   #8
Jamii is offline Jamii  Australia
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What about this design I came up with in BBP6, it's huge!. It's got the right frequency response but the group delay might be too high? It's above 24ms. 250L box for a 10" sub.

Might try and sim a box that's smaller, might reduce the group delay, the F3 will be higher though. Music doesn't have much (any) content below 30hz usually anyway, right?

I think this driver was intended to be used in a sealed box, don't really want to go down that path.

James
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Old 9th January 2013, 11:28 PM   #9
Jamii is offline Jamii  Australia
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Here is a much closer design to your BR in Hornresp, the frequency response is not as flat / different?

James
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Old 9th January 2013, 11:43 PM   #10
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by Jamii View Post
Here is a much closer design to your BR in Hornresp, the frequency response is not as flat / different?

James
Hi James,

You are using T/S parameters for only one coil, when the coils are in series or parallel: Qes should be (Qes single coil)/2..

b
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