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_djk_ , question for you... |
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PoteirosCorp 
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 Topic: _djk_ , question for you...Posted: 09 June 2008 at 7:16pm |
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I send you PM but had no answer.
I was watching at diyaudio that you post some 15" tapped plans for the 3015LF, but the images are no longer avaible, is there any way you can re-post them here ?? I'm looking for Live Sound. Thank you very much. Best Regards. Edited by PoteirosCorp - 09 June 2008 at 7:19pm |
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_djk_
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Posted: 11 June 2008 at 12:47pm |
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| 35 Hz Tapped Horn Def_Const |Horn Dimensions { Def_Driver 'Dr1' | Eminence 3015LF Sd=1762cm2 system 'S1' Driver Def='Dr1' Node=1=0=3=4 This is two horns (each horn would have a mouth of 3200cm^2). Combined response in half space is ±2dB from 31.5hz to 150hz. 108dB/2.83V at 36hz.
 Let me know if you only need to go to 42hz and I will do something smaller. Edited by _djk_ - 11 June 2008 at 12:51pm |
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djk
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MarjanM
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Posted: 11 June 2008 at 1:01pm |
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Can you model KappaPro15LF for me. Plizzzz
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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PoteirosCorp
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Posted: 11 June 2008 at 5:38pm |
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_djk_ thank you very much !!
Something smaller will be desirable, as I do mostly live sound. Thank you again |
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_djk_
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Posted: 14 June 2008 at 12:30pm |
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±2dB from 37.5hz to 136hz, 108dB at 42.4hz (two units stacked in half space). Mouth reduced from 3200cm^2 to 2400cm^2, length cut to 200cm from 250cm (Fc about 6hz higher).
You can use the same design for the Eminence 3015LF with the same results. This is quite a bit smaller than the other TH. You can further cut the mouth down to only 1600cm^2, but you will loose 2dB of efficiency (106dB vs 108dB).
| 40 Hz Tapped Horn
Def_Const |Horn Dimensions { Def_Driver 'Dr1' | Eminence Kappa Pro 15LF2 Sd=1712.6cm2 system 'S1' Driver Def='Dr1' Node=1=0=3=4 Edited by _djk_ - 14 June 2008 at 12:49pm |
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djk
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PoteirosCorp
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Posted: 16 June 2008 at 9:08pm |
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Thanks again _djk_
I was watching this: http://speakerplans.com/forum/forum_posts.asp?TID=14676&KW=tapped&PID=141287#141287 but I couldn't figure out that drawing with the one on the link on the last post. In order to get the proper dimensions of the script you post. Thank you very much |
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_djk_
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Posted: 17 June 2008 at 9:28am |
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Remember, the script is for two horns. Where the mouth area says 4800cm^2, that's 2400cm^2 per cabinet (areas half, distances stay the same).
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djk
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PoteirosCorp
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Posted: 23 June 2008 at 11:30pm |
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Hello _djk_
I downsize to 1600cm2 mouth, should I put 1400cm2 for a3 or leave it with 1600cm2 ?? Another thing, I can not phisically put L1 to 13cm, as the woofer itself have a radius of 20cm Thank you very much |
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_djk_
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Posted: 24 June 2008 at 5:14am |
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"I downsize to 1600cm2 mouth, should I put 1400cm2 for a3 or leave it with 1600cm2 ?? "
It is a good idea to have some taper along the full length of the TH, to reduce ringing from parallel walls if nothing else. If the driver mounting board is at some kind of an angle (as above) from the outside wall, that's probably enough taper. Walt's stepped horn worked OK even though there was no taper in that area.
"Another thing, I can not phisically put L1 to 13cm, as the woofer itself have a radius of 20cm" I realize that, the modified photo was of a project that someone here just knocked up without any simulation. Despite that, he was happy with the results, and that's really all that matters, isn't it?
The small end of the TH determines the behavior at the top of the pass-band. His large cavity would mess up anything above 100hz or so, but in many cases it won't matter as we may choose to cross over below this point. The black-line board I added to his photo was a suggestion to improve the upper bandwidth, and add a little length to the TH, gaining a bit more low extension.
The lower the Qts of the driver, the closer it likes to be to both the throat and the mouth, and the smaller the throat can be. I optimized the 40hz script above for two of the Eminence Kappa Pro 15LF2, it should work well in singles and quads as well. With the Eminence 3015LF in the same script it looks quite good too. With its higher Qts the Eminence 3015LF is quite flexible. For an optimum design I might increase the areas and lengths, but this will make the whole box bigger, and we were looking for something smaller. What the l1 = 13e-2 and a1 = 425e-4 (for one driver) is telling us is that we want to reduce the cavity size. We can use a couple of boards in a 'V' arangement as well.
General idea (but not exactly as shown)
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djk
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