Kick Bin Design Idea B&C 15ndl76 |
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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Little more progress on the horn path to improve the LPF & linearity of the response.
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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Front chamber is now down to 16L and the s2 and s3 have increased a fair bit.
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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Here's the 2pi in case anyone is interested, I wish it looked this good in 4pi!
(not too bad for just over 125L, I don't think)
Edited by luthier - 04 February 2019 at 12:00am |
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shello79
Registered User Joined: 24 May 2010 Location: Saint Lucia Status: Offline Points: 27 |
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any progress on this idea
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Work hard play even harder
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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No big progress yet, I've been working a lot recently and havn't had much energy.
I'm increasing the throat size to reduce the compression ratio, I'm also moving away from the porting. My thoughts being if I can't get the results I want with a sealed chamber there is nothing stoping me adding them at a later date. Removing the ports has a few noticable implications it increases output above 130hz and causes it to drop drastically below 120hz. To increase output in the lower region I have to reduce the chamber volume to 40L. Interestingly if I model the horn as a single section (without ports) the off axis response is relativley smooth and very sensitive. |
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RoadRunnersDust
Young Croc Joined: 03 December 2013 Location: United Kingdom Status: Offline Points: 560 |
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Interesting design/build to follow!
Have you tried sim'ing the Beyma 15LW30 in it? |
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fatfreddiescat
Young Croc Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1081 |
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Hi Luthier, just found this again, I was meaning to post it a while back but couldn't find it,
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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Thanks! I did try it in the ported version. Here's the Beyma (grey) vs the 15ndl76 (black) Edited by luthier - 15 March 2019 at 9:00am |
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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Thanks for that, It was a really informative read!
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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So before the big update on the project here's a screen grab from solidworks; you can see a couple of fouling issues but this is pretty much the final layout for prototyping. Edited by luthier - 01 April 2019 at 11:14pm |
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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So here's the big update!
I've CNC routed both side panels for one cabinet, but it didn't come out all that great. The software native to the router is bit of a pig and doesn't like working with STL files. For good results I wanted to use combination milling but the tool paths were ridiculous (it would have taken over 3 hours per side) so I ended up using Z-axis milling. This worked but meant the pieces needed a bit of fettling so I cracked out my hand planes as It’s much quicker for me than the router table. On a side note the cutter was also really blunt which left some less than desirable results. |
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