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Danley BC series (BC215, BC415, BC218)
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asaa00 View Drop Down
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    Posted: 02 September 2023 at 8:22pm
Hey all

So, a while back I had the absolute pleasure of hearing the Danley BC215. This was the most hifi, absurdly fast and absolutely physical subwoofer i have ever heard in my life. I was absolutely blown away, especially considering there were only two of these boxes setup outdoors.

Quote The BC subwoofer is another unique subwoofer alignment from Danley Sound Labs. Using woofers that combine into a single
exit provides impressive punch and extension out of a single cabinet. Due to the physical size of the BC design’s center exit the
boundary exhibits forward directivity which can be increased with multiple enclosures.


I think they are an FLH, with two drivers, with a side exit, (or 4x 15" for the BC415 or 2x18" for the BC218) designed to be used next to each other with the exits coupled.

BC215/415: -3@33hz and -10@28hz. 
BC218: -3@26hz and -10@22hz
I heard these outside, away from any walls, and it was incredible.



Do you have any idea what this design is, or where I can find a plan something similar? I would love to be able to DIY these. Any input would be appreciated!




Edited by asaa00 - 03 September 2023 at 7:15pm
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MarjanM View Drop Down
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Points: 7845 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 03 September 2023 at 7:33am
These are commercial products so free plans do not exist.
Also sharing plans for commercial products is not what we do here. So please stop asking for it.
Marjan Milosevic
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www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
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asaa00 View Drop Down
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Points: 365 		Post Options Post Options   Thanks (1) Thanks(1)   Quote asaa00 Quote  Post ReplyReply Direct Link To This Post Posted: 03 September 2023 at 7:16pm
Originally posted by MarjanM MarjanM wrote:

These are commercial products so free plans do not exist.
Also sharing plans for commercial products is not what we do here. So please stop asking for it.




Really, I meant I'm interested in anything based on similar concepts. I didnt mean I only was looking for the exact plan

I apologize, I have edited my post to reflect this
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Points: 1128 		Post Options Post Options   Thanks (0) Thanks(0)   Quote fatfreddiescat Quote  Post ReplyReply Direct Link To This Post Posted: 03 September 2023 at 8:09pm
Lab12 was a Danley design he did for the DIY community, still a good box.

Edited by fatfreddiescat - 03 September 2023 at 8:10pm
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https://www.youtube.com/watch?v=mRpty-ciVpE
When you gonna send me some $$ mate ?
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Points: 538 		Post Options Post Options   Thanks (0) Thanks(0)   Quote doller Quote  Post ReplyReply Direct Link To This Post Posted: 14 September 2023 at 12:15pm
WTF that video is just rubbish tells us nothing. About anything just some person on SketchUp and the music is annoying. . Not even close to the Danley. 
Who was it on here that did the bc design ? or was thinking about it. 
I think maybe one of the American forums might be more help. 
Yes labs still deliver just big and Hevey. 
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Points: 1924 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2023 at 7:03am
Originally posted by doller doller wrote:

WTF that video is just rubbish tells us nothing. About anything just some person on SketchUp and the music is annoying. . Not even close to the Danley. 
Who was it on here that did the bc design ? or was thinking about it. 
I think maybe one of the American forums might be more help. 
Yes labs still deliver just big and Hevey. 


Iirc  recently joined member "kapha sound" started a thread on this..... should be easily found by browsing, i saw the thread the other day, should be on page 1 in one of the main forums (other designs, new projects, etc......) 
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Points: 1271 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Keen Quote  Post ReplyReply Direct Link To This Post Posted: 28 September 2023 at 10:13am
The original concept was called the BDEAP (boundary dependent external air path) sub. It's a normal horn that doesn't fully expand until after the relatively small opening. The boxes are positioned in a way that then allows the uniform expansion of the horn to continue beyond the opening using the ground and the outside face of the boxes as the boundary. Its a great idea because you end up with the performance of a big horn with half the footprint. 

Edited by Keen - 28 September 2023 at 10:53am
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Points: 1271 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Keen Quote  Post ReplyReply Direct Link To This Post Posted: 28 September 2023 at 10:24am
I'll help you build one if you like, they're pretty cool. I've been working on a plan lately
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Points: 5 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SalixSound Quote  Post ReplyReply Direct Link To This Post Posted: 11 December 2023 at 7:44am
FKA Kapha Sound here. I'm still planning on building a 15in concept around this design. The other notable design that's similar imo is the Lambda Labs digital horn. My main question at this point is how much tolerance there is for a gap between cabinets. For example I've seen as much as an inch or 2 between Danley BC218s which I'd have to imagine would impact the coupling effect to some extent, but those cabinets are monsters and I doubt most folks using them really need a -3 down to 26hz. I did notice that just like the Digital horn the new BC215s include a removable panel that allows you to seal all sides besides the mouth perhaps to reduce any negative effects from less than perfect coupling between cabinets. If anyone has any CNC connects in the Seattle area let me know and I'll certainly report back.

Edited by SalixSound - 11 December 2023 at 6:37pm
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Points: 1271 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Keen Quote  Post ReplyReply Direct Link To This Post Posted: 25 December 2023 at 12:57am
The closer the cross sectional area of the gap would get to the cross sectional area of the relatively small opening in the box, the closer the concept gets to losing its directivity gain. This is because the radiation starts to use both front and back of the box thus radiating in 360 degrees before the ‘horn’ path terminates therefore losing any directivity gain. 

Small gaps of a few inches between boxes or the ground won’t affect much loss in directivity gain. 
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Points: 12 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PTSD Quote  Post ReplyReply Direct Link To This Post Posted: 09 August 2024 at 4:43pm
Hey this thread is rly old but I am curious if you ever managed to draw up a plan for a subwoofer functioning in this way?

If yes I would be interested if you would maybe share some info with me.
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