Dayton Classic 18" DCS-450 - Tapped Horn? - diyAudio
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Old 4th November 2009, 06:01 AM   #1
dolinux is offline dolinux  United States
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Default Dayton Classic 18" DCS-450 - Tapped Horn?

I got a deal on a Dayton Classic 18 and would like to put it in a tapped horn. I have read through the collaborative tapped horn thread(!), which is slightly overwhelming. I don't mind fiddling with HornResp, but I would like some recommendations. I also need help taking the HornResp data to actual plans. Carpenter posted plans for an 18" TH, which I attached. The tallest I could go is about 94".

Included some pics of my 2 x Exodus DPL-15 IB .
Attached Images
File Type: jpg DCS450-4.jpg (110.2 KB, 704 views)
File Type: png Carpenter - 18 in tapped horn.png (38.4 KB, 681 views)
File Type: jpg 34ywef5.jpg (144.6 KB, 667 views)
File Type: jpg 28rzj48.jpg (174.6 KB, 653 views)
File Type: jpg 20fcbox.jpg (206.4 KB, 636 views)
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Old 4th November 2009, 05:34 PM   #2
dolinux is offline dolinux  United States
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This could be approx 20"x20"x92" to get the volume necessary. Am I in the ballpark?
Attached Images
File Type: jpg parms.JPG (57.9 KB, 152 views)
File Type: jpg spl.JPG (44.1 KB, 126 views)
File Type: jpg HornResp2Box.JPG (23.6 KB, 153 views)
File Type: jpg guessing.JPG (12.8 KB, 141 views)
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Old 5th November 2009, 06:36 PM   #3
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by dolinux View Post
..Am I in the ballpark?..
Hi dolinux,

Check your driver T/S data (Mmd?),see my picture:

b
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File Type: gif Dayton_18in_T-TQWT.GIF (169.4 KB, 258 views)
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Old 6th November 2009, 12:37 AM   #4
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Bjorno, Interesting that u used a tapering line instead of an expanding line for the tapped horn. What are the benefits in doing that?
Your sim has a really nice and flat freq response.
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Old 6th November 2009, 02:34 AM   #5
dolinux is offline dolinux  United States
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Bjorno,
Thank you for the information.

I am reading about TQWT and what little I can find about T-TQWT. I even figured out how to use HR to calc T/S parms I am hoping to get a box designed and built within the next 10 to 14 days. I will post plans and build pics. Is the any difference between slotted and circular ports for S4?
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Old 8th November 2009, 04:38 AM   #6
dolinux is offline dolinux  United States
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Here are plans I came up with based on Bjorno's drawing and the HR data listed above. I have not included the bracing yet.

Do the yellow dots in the drawing represent stuffing?

If someone will verify that the plans are close enough, I will begin building. I would also be happy to post the sketchup file if anyone is interested.
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File Type: jpg Bjorno_side_view.jpg (13.2 KB, 268 views)
File Type: jpg TTQWT-Dayton-DCS450.jpg (62.9 KB, 211 views)
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Old 11th November 2009, 06:33 AM   #7
dolinux is offline dolinux  United States
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Default Sawdust!

I converted it to inches so I could get it cut at Home Depot. The sketchup model I used is attached. Should have build pics within a few days. I'll update the model to include the access panel when I get to that point. Be advised that this has yet to be built and/or tested.

Front / Back (2) 54 1/8" x 20"
L Side / R Side (2) 54 1/8" x 20 5/8"
Top / Bottom (2) 18 1/2" x 20 5/8"
Baffle (1) 18 1/2" x 43 1/4"
Attached Files
File Type: zip TTQWT-Dayton Classic 18 Inches.zip (7.5 KB, 64 views)
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Old 23rd November 2009, 08:11 PM   #8
dolinux is offline dolinux  United States
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I finally got my camera. Here are pics of the assembled box. Testing with a Dayton 240w plate amp. The the sound level and range is impressive. I used 2x2" bracing in the vertical corners, and to make assembly faster.

I also built a scaled down version for a $30 12" PE buyout sub that I picked up, which is also impressive. I may start a new 'budget T-TQWT' thread for that one, <$100 for everything but the amp.

Thanks again bjorno!
Attached Images
File Type: jpg Back.jpg (95.5 KB, 165 views)
File Type: jpg Front.jpg (33.3 KB, 101 views)
File Type: jpg Mouth-Scale.jpg (65.8 KB, 135 views)
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Old 24th November 2009, 08:30 AM   #9
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I too am curious about reverse taper tapped horns. From what fiddling I've done it seems they tend to further spread the bandpass while sacrificing some efficiency.

FWIW here's some rules of thumb I've gotten from playing with hornresp and akabak. It should be emphasized that I have not tested all of this with actual builds and measurement:

You can generally get a good response with a mouth size ~ driver sd. A mouth size double sd gets you +3dB output. Then, varying S1 affects the smoothness of the response: at some middle point ripple in the bandpass region is minimized to some amount (determined by driver q). S1 larger than this lowers f3/f10 at the cost of increasing the peaks and dips. S1 smaller than this raises f3/f10 up to some point, then increases the peaks and dips. Minimum ripple seems to be around 1/10th mouth size.
Varying L12 and L34 shifts the ripples around somewhat.
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Old 28th November 2009, 12:58 AM   #10
freddi is offline freddi  United States
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cool! - this might be a way to go for me -- 12" driver version would be nice - here's a rough test inverted test pipe I did from one 4'x8' sheet of plywood, and had ~10dB dip@125Hz

YouTube - 7.4 cubic foot inverted tapped horn/transflex-type test pipe from 1 sheet of plywood
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