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B&C 18SW115 enclosure design

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Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Speaker Sol Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2017 at 12:25am


Very nice.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crashpc Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2017 at 2:18pm
Here is my 18SW115 (135l, 34Hz). Does good job, but will be replaced by 21DS115.



Today I got it past Xmax for a while (16,5mm), and even under tuning, it can do a lot, while staying quiet in terms of port or cone noises. It did very quiet friction hissing noises around the surround and wires, so if it played some real sound, it would not be noticable except for distortion of the sound if any. Awesome driver, really. Hope 21DS115 gets me even further.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2017 at 8:16pm
@Crashpc
Nice!

At the moment I'm making some sketches for the mid/highs.
30L Net (I know that's small) but I'm gonna try the 12NW76.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crashpc Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2017 at 7:15am
Yeah, I'm pretty sure 21" will be absolute "solution" for me for a while.

I'm thinking about larger tops too. Maybe 10NW64, but with some slightly larger horn for high tone drivers, and I cannot figure out how to make it compact enaugh for PC table.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote osse Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2017 at 9:58am
Originally posted by smitske96 smitske96 wrote:

@Crashpc
Nice!

At the moment I'm making some sketches for the mid/highs.
30L Net (I know that's small) but I'm gonna try the 12NW76.


Very interesting system, I have a pair of 18sw115 loaded keystones which are great but I wonder how much you win compared to a small BR cab like yours with close to the same -3dB.

Would be interesting to hear your plans for the 21ds115 and 12nw76. I've been looking at the 12nw76 driver and got particularly interested in it when I saw the BR top cab b&c has suggested on their site using it, very strong above 100
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2017 at 4:46pm
I've read that a (good designed) TH will win 6dB over a single reflex enclosure with the same driver.

I'm also very curious towards the 12NW76, they have to reach 80/90 Hz.
The current design I have for the 12NW76 is tuned at 70 Hz with 30 L Net volume.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crashpc Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2017 at 7:48pm
Smitske96:
It's not because of you saying it, but I absolutely hate that claim. There are few threads on diyaudo, one is even called "case study" about TH being 6db louder. That is very misleading generalization. It only works for certain bandwith without box volume comparison. I.E. per driver maximum performance. But once you check with box volume suited for BR box, and frequency bandwith, TH really doesn't run anywhere. So one should make his choice carefully. Th also has specific colour and distortions. Distinctively different than BR. Generally lower, but again, not across the whole bandwith. I like BR boxes more because of that...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2017 at 12:59am
Ofcourse there are some compromises to be made! But if you would build a cab tuned to 35 Hz, the volume would still be 200 L +-. So a real comparison would be, a cab tuned to 35 Hz with the 18sw115. If the BR cab would come on top in sound quality that's just a + for the BR. If the TH could outrun the BR in SPL that would be a + on the TH. 

Just to be clear, my comparison is made to a BR cab tuned to 35Hz (approximately).
And I am very interested to do a comparison with a BR cab with the same tuning.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2017 at 2:37am
I did compared a double 18 reflex with internal volume of 450lit and tuned to 37hz to a TH single 18 with the same driver.
The double 18 stomped the TH is every aspect possible. But it does need double the power.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2017 at 9:13am
Originally posted by MarjanM MarjanM wrote:

I did compared a double 18 reflex with internal volume of 450lit and tuned to 37hz to a TH single 18 with the same driver.
The double 18 stomped the TH is every aspect possible. But it does need double the power.


What were size/weight differences?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2017 at 9:43am
The 218 is 1160x580x780, 88kg.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crashpc Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2017 at 2:25pm
smitske96: My 18SW115 box is 34Hz and 135l.



I doubt it´s possible to make such small 18" TH with comparable range or SPL. Something would have to go...
Nikon and Canon people should not be married to each other. Why did you let this happen?
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