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derivatives of the 1850 design

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Badger74 View Drop Down
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    Posted: 20 February 2015 at 6:33pm
I've built a few 1850 cabs following the measurements as given in the plan section.

 However, i'm a stickler for having things looking different so i decided to build another one to my design.

 The overall dimensions are pretty much the same ( 10mm thinner and 15mm shorter though ) and the throat and mouth are pretty much the same, inside however i've changed the angles slightly.

 I've just run a test and i'm happy with it so far although i need to fix the brace correctly in the mouth opening, it does require running from 60hz which is fine as i have some TCB to build next to handle low down shizzle.

 My question is a general one though, is this still a 1850 or is it my own design?  

 I genuinely took the idea from building 1850's but adapted it to my own design, but it still retains some of the original...

thoughts please 


Edited by Badger74 - 21 February 2015 at 9:11am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2015 at 3:19am
Depends what you mean by 'is it yours' - if you try and sell it as a commercial cabinet it's questionable, really depends how similar - if not, why does it matter?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Badger74 Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2015 at 7:17am
I guess i'm just honest, i'll give credit where credit is due.  I wouldn't have built this from scratch just yet as i'm still learning but i would like to brand this ( when asked what it is ) as my own design & build with a nod to the original designer.

As for commercial gain, none planned unless peeps want me to build some for them.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote bitSmasher Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2015 at 11:13am
IMO basic dimension adjustments don't count as new/unique
If you were to calculate a horn from scratch and "borrow" the fold pattern appropriately then it'd be your own
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djeddie Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2015 at 2:06pm
Just throwing my 2p into the mix... just take a look at the 1850 plan and then look at the Eminence plan.
There are only so many ways you can fold a horn, there's bound to be similarities.
Chas n Dave : it's like Drum and Bass but with beards.             E=mc² ±3dB
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2015 at 2:58pm
Can you post the layout so we can look at it? You say it only operates from 60Hz and up so that to me suggests it must be quite a bit more different than you're suggesting, it also suggests you haven't made a very efficient use of space.. If you're using dedicated sub boxes you can get away with a much smaller box.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Badger74 Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2015 at 4:22pm
I dont have any plans, i began with the internal measurements pretty much the same as the original design, from there i re adjusted some angles to fit what i had in mind.  Keeping the throat the same, the baffle in the same place and angle, the throat is pretty much the same but with a curved exit point.

 As for the 60hz comment, the drivers work best from 54hz upwards ( PD 1850MK2 ) and i'm not looking for sub sound, keeping them above 60hz for me works.  However this is the first, i have 3 more to build of this design, when they are built i will work on the best parameters i wish to run the lot on.

Here's a few pics as i keep describing it, bracing still to be fitted;







Edited by Badger74 - 21 February 2015 at 4:30pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote b grade Quote  Post ReplyReply Direct Link To This Post Posted: 21 February 2015 at 6:43pm
If there are any parts of the exact dimension or angle people would call you on it if you tried to claim it as your own. Just call it a 1850 remix. I would feel a little sheisty trying to pretend I did not borrow heavily from a design so I would just own up to it from the gate rather than wait to get called on it.

I like the way you made negative space in the external box shape with all the dead space. I wonder though about using the front reflector up top as the external panel. The last vertical panel (Omitted in your version) in the front is supposed to be a part of the mouth, where I think the sever angle back will drop the sound and act as a slightly smaller mouth and even a slightly shorter overall path. I put handles on mine on the front panel, and I regret it because I fell like I am losing something by not having the whole panel.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Badger74 Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2015 at 9:47am
I thought about the removal of the final panel affecting the overall idea of the horn shape and looking at it more and more, i dont think it will make any difference. 

 If the extention of that last little bit was affecting it, i would've expected it all the way around the mouth though, ie an extention on the bottom vertical and both sides...but maybe i'm looking at it incorrectly?

 I believe it was part of the overall design to bring it all together..the mouth flares upto that point, perhaps Mr Rog thought it looked good to keep that little bit recessed...i honestly done know.

 I have run some hearing tests over the weekend and it sounds no different to a standard 1850.  
 
I also designed and built a brace design which i think works and so far, again, has made the sound no different to a standard 1850.

 My understanding ( being a carpenter/joiner for some time ) is that a force acting upon a tube in a vertical manner, will squash the tube in the horizontals, abit like standing on a ball.  If the horizontal sides of the tube are braced, then it provides a solid brace....

thoughts on this brace;


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shortrope Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2015 at 9:52am
Nice brace!
My Tinnitus is coming along nicely!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bitSmasher Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2015 at 9:01pm
Would that cause a weird resonance?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djeddie Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2015 at 9:46pm

So apart from the side panels being curved and the panel on the top of the front not being there, exactly how different are they to the original?


Edited by djeddie - 23 February 2015 at 9:48pm
Chas n Dave : it's like Drum and Bass but with beards.             E=mc² ±3dB
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