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T Line Waveguide inspired build help
T Line Waveguide inspired build help
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Old 10th December 2016, 11:10 AM   #1
land61 is offline land61
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Join Date: Dec 2016
Default T Line Waveguide inspired build help

Hello,

I've always liked the bose waveguide but realize it is a product based on some fundamentals that revolve around the tline design of speaker enclosure

So i set about building my own project stereo tline box.

Any comments on the choices I have made are appreciated.

So
2 scanspeak 12w/8524g00 8ohm fs 52Hz 40wrms
2 Monacor DT-99 8ohm rec x over 2500hz 40wrms

6db monacor xover at 2.5Khz
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Old 10th December 2016, 11:29 AM   #2
land61 is offline land61
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More info, the box will house left and right speaker sets and have a folded tl

fs=52hz so a 1/4 wave is 1.65m

the design of the box is mdf, I have built the box and am just waiting for the scanspeak speakers

The amp is a sure 50w unit

pictures to follow

I am predicting that the dt-99s will need turning down to match the scanspeaks but I don't want this to affect my crossover, an input of where to start with this would be great.
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Old 10th December 2016, 11:43 AM   #3
land61 is offline land61
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Right the pictures,

The tl goes from the back of the driver, folds up to the front then to the back, finally exiting next to the speaker through the square port shown in the photo.
The diameter of the driver cone is 100mm so the tl is 100mx100mm
The box has 45 degree deflectors in the folds

http://i32.photobucket.com/albums/d4...ps2s5neps9.jpg
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Old 10th December 2016, 12:55 PM   #4
land61 is offline land61
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Click the image to open in full size.
Hope you can see that
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Old 10th December 2016, 12:59 PM   #5
land61 is offline land61
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This shows the front with tl opening " square" then next to them bass openings

Above these are tweeters and the 2 other holes are to mount crossover bits
Click the image to open in full size.
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Old 10th December 2016, 01:44 PM   #6
land61 is offline land61
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This is it today, looking forward to trying the scanspeaks in it to see if it will work well or be firewood

Any advise?
Click the image to open in full size.[/URL]
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Old 10th December 2016, 03:24 PM   #7
land61 is offline land61
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Anyone have any input on this?
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Old 10th December 2016, 04:32 PM   #8
GM is offline GM  United States
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Greets!

Well, based on the woofer's published specs........ to tune to Fs the cut length will be somewhat shorter and after factoring in damping, shorter still.

Tutorial: http://www.quarter-wave.com/TLs/Alignment_Tables.pdf

Excel calculator: http://www.quarter-wave.com/TLs/Alig...tor_3_3_09.xls

That said, low Qts drivers [< ~0.7] tend to perform better overall tuned to Fs/Qts, especially when end loaded, so can be even shorter.

Note that the shorter it is, the greater its area, damping density ideally needs to be to compensate for the lost net volume [Vb], so maybe no net total cab size.

Not familiar with any of the drivers, so that's it for me.

Good luck with it!

GM
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Old 10th December 2016, 05:29 PM   #9
land61 is offline land61
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Join Date: Dec 2016
Quote:
Originally Posted by GM View Post
Greets!

Well, based on the woofer's published specs........ to tune to Fs the cut length will be somewhat shorter and after factoring in damping, shorter still.

Tutorial: http://www.quarter-wave.com/TLs/Alignment_Tables.pdf

Excel calculator: http://www.quarter-wave.com/TLs/Alig...tor_3_3_09.xls

That said, low Qts drivers [< ~0.7] tend to perform better overall tuned to Fs/Qts, especially when end loaded, so can be even shorter.

Note that the shorter it is, the greater its area, damping density ideally needs to be to compensate for the lost net volume [Vb], so maybe no net total cab size.

Not familiar with any of the drivers, so that's it for me.

Good luck with it!

GM
Thanks for the info, ill get the matches it will be interesting to see what it is like with no stuffing
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Old 10th December 2016, 05:49 PM   #10
land61 is offline land61
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What free pc based frequency software is recommended to look at the output?
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