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21" Ported Horn design idea
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Arcy12 View Drop Down
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Points: 12 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcy12 Quote  Post ReplyReply Direct Link To This Post Posted: 01 April 2020 at 12:23pm
Hey dude I'm keen to put one of these together,  could i have a cut list and routing details.
Cheers
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NiToNi View Drop Down
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Points: 17 		Post Options Post Options   Thanks (0) Thanks(0)   Quote NiToNi Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2020 at 12:59am
+1

Would love to have a go at this mate!

... although slightly lower corner at 27 Hz would have been perfection Wink
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Fracture_clinic View Drop Down
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Points: 113 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fracture_clinic Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2020 at 1:38pm
I cant install Hornresp on my machine (admin issues) can anyone speculate these changes please?

1) larger chamber all else the same
2) larger chamber and horn extended through 90 degrees (over the port exits) and along width of box. Assume ports are relocated + ignore external dims for now. 
3) Same as above but with chamber remaining the same.

Asking a lot I know - until lockdown is over I can't jump on a buddies laptop to try myself. 

Not asking for sims just interested in bouncing ideas around.

TIA


Edited by Fracture_clinic - 14 May 2020 at 1:40pm
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bob4 View Drop Down
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Points: 1791 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 30 July 2021 at 4:00pm
Kevin, we would like to build your ported horn, any chance of getting a set of plans? 

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smitske96 View Drop Down
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 22 November 2021 at 8:42am
Looks like a similar idea:
http://https://www.seeburg.net/en/customsolutions/ps-sub/175
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smitske96 View Drop Down
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 29 November 2021 at 9:38am
Am I correct in thinking that they tune the BR port high and the horn low? 
In all other quick sims, I can not reach such 2,83V sensitivity figures.
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toastyghost View Drop Down
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Originally posted by smitske96 smitske96 wrote:

Am I correct in thinking that they tune the BR port high and the horn low? 
In all other quick sims, I can not reach such 2,83V sensitivity figures.


I would treat the Seeburg as a variant of tapped horn, rather than a rear ported horn. It’s very dark in the renders, but I have a feeling that the driver ‘vent’ also opens into the horn mouth based on a similar design I saw elsewhere.

Also that’s the peak sensitivity value in the specs. Not the average.

Edited by toastyghost - 29 November 2021 at 9:53am
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smitske96 View Drop Down
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 29 November 2021 at 1:40pm
Yes, but it even has a similar/higher sensitivity @50Hz than for example a BC218.
According to the measured response peak sensitivity is around 111/112dB @+-150Hz, which does fall out of the desired bandwidth but still is pretty high.

If I may ask, which design are you talking about regarding the vent also tapping in the horn mouth?
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bob4 View Drop Down
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Points: 1791 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 29 November 2021 at 4:29pm
Originally posted by smitske96 smitske96 wrote:

Am I correct in thinking that they tune the BR port high and the horn low? 

Isnt that very unlikely, since you need lab horn size for real 30 hz horn loading (in multiples of four!!)

I would have guessed the reverse Confused


Edited by bob4 - 29 November 2021 at 4:29pm
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MarjanM View Drop Down
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That Seeburg box looks like the old Martin Audio ported horns.
Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
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AlphaC View Drop Down
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Joined: 02 February 2022
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Originally posted by MarjanM MarjanM wrote:

That Seeburg box looks like the old Martin Audio ported horns.

Which Martin model do you refer to? I'm not aware of any similar design.
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smitske96 View Drop Down
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Points: 1036 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 02 February 2022 at 2:24pm
@bob4 

2,6m seems doable with those dimensions.
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