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21 inch long throw horn
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Pasi View Drop Down
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Joined: 25 April 2010
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Points: 2685 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pasi Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2013 at 12:05pm
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paulronanqed View Drop Down
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Points: 8 		Post Options Post Options   Thanks (0) Thanks(0)   Quote chriller29 Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2013 at 1:16am
Is this just a drawing of a horn there would look nice, or has it been designed to "work", and performe what's possible?

I am about to build som 21" subs, and this design has been my favorite so far. I just dont want to end up with two horn which performe at the same level as the pd 1850.........


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Joined: 10 August 2009
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Points: 1886 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tv00 Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2014 at 10:05am
Good question, dead end?
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pfly View Drop Down
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Points: 2827 		Post Options Post Options   Thanks (0) Thanks(0)   Quote pfly Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2014 at 11:01am
What do we have here?

This has not been built but the design is pretty much at a point where next step would be the prototype.




PD.2150 2pi 2,83v


PD.2150 0,5pi 1,41v


input:


file:
https://dl.dropboxusercontent.com/u/9726318/flh121/flh121_pd2150.skp

Please note that I am quite conservative with my HR data. If this works like previous designs I have done, the real world frq response should be slightly better than the HR prediction.

Horn path needs to be heavily braced. After that I don't see problem with building it out of 18mm.

PD.2150 SHOULD fit through the access panel frame, but it has not been tested so this is something to consider. External dimensions are 1200*1200*600mm, so the two sides can be cut out of single 2440*1220mm sheet and when stacking or transporting these boxes would be nicely symmetric.

I would love to see this in reality.
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MarjanM View Drop Down
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Points: 7844 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2014 at 1:51pm
Id rather build a labsub. Same size as that box.
Marjan Milosevic
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pfly View Drop Down
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Points: 2827 		Post Options Post Options   Thanks (0) Thanks(0)   Quote pfly Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2014 at 2:37pm

As much as I like the Lab Sub, I don't think it is the box to end all boxes. PD.2150 has around 1.7 times the cone area to start with. And most importantly this was a nice study to work on. Unfortunately I do not have time or funding to develope this.
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MarjanM View Drop Down
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Points: 7844 		Post Options Post Options   Thanks (1) Thanks(1)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2014 at 5:44pm
Yes but Lab12 has lot more x-max. So displacement is much bigger then on your average 12 inch driver.
And it is a proven box. No need for expensive experiments. 

Edit: Oh and i dont really want to know how much it cost to recone the PD2150.


Edited by MarjanM - 13 October 2014 at 5:45pm
Marjan Milosevic
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tv00 View Drop Down
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Joined: 10 August 2009
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Points: 1886 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tv00 Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2014 at 9:01pm
I was thinking about doing something with the lf21n551, xmax 15mm, BL 39, but the fs is up at 35hz, but actually I was modelling tapped horns, had a look at the orthon horn too.
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pfly View Drop Down
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Points: 2827 		Post Options Post Options   Thanks (0) Thanks(0)   Quote pfly Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2014 at 9:29pm
So if there is one design that you happen to really like, there is no point in doing other design exercises? Okay.

Btw

Lab12:
Sd = 506,7 cm^2
Xmax = 13mm

2 * 506,7 * 1,3 = 1317,42 cubic cm

PD.2150:
Sd = 1698,23 cm^2
Xmax = 10,5mm

1698,23 * 1,05 = 1783,1415 cubic cm

There are many, MANY sides to this matter. Lab would be more economical when it comes to drivers and it would be smaller but then again when it comes to horns, smaller does not equal better in every aspect. Ease of build would be one thing to consider also. The displacement of PD.2150 versus two Lab12s is 35% bigger, that should do some difference, as should horn's 10% larger frontal area.

But then again the design is not tested so why bother?

Please also notice that I do really like the Lab

Also it would be interesting to see how a big horn would work with something like 18Sound 21NLW....


Edited by pfly - 13 October 2014 at 10:09pm
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tv00 View Drop Down
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Joined: 10 August 2009
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Points: 1886 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tv00 Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2014 at 10:22pm
lf21n551:
sd: 1730
xmax 1,5 cm
1730*1,5= 2595

Don't mean to be no commercial, just seems like people on here have their heads turned one way sometimes. Note: this is a neo .which is nice for a 21"! It costs less than 100 euros more than 2150.
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JR.junior View Drop Down
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Points: 1789 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JR.junior Quote  Post ReplyReply Direct Link To This Post Posted: 14 October 2014 at 6:25am
@ ply, this is serious instal club sub. -3db @ 31,5Hz!
Support the scoop technology, larger mouth plays louder!
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