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New Sub-Horn plan?

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URL: https://forum.speakerplans.com/forum_posts.asp?TID=4334
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Topic: New Sub-Horn plan?
Posted By: al_x
Subject: New Sub-Horn plan?
Date Posted: 19 March 2006 at 7:29am

Ive been messing about on paint to come up with a new 18" Folded horn to be used for true sub bass (like the lab sub) as apposed to the rib breaking kick of an 1850 horn say.

I have tried to achieve this by making the horn length quite long (about 3m) . Im quite a novice in this field so any critisisms are more than welcome so i can modify it etc. also would an 18" driver be suitable for such a large horn length?

heres the general layout:




Replies:
Posted By: Jay Lawless
Date Posted: 19 March 2006 at 12:10pm
a large horn length just extends the lower f3 a little more. more horn path = lower frequency, but a bad part i see here is that you'r horn mouth is much too small. extend the front by about 15.25cm and add a bit more to the horn mouth to bring out the kick *SPL*. also i would sugjest using the rearchamber of a 1850horn for refference for you'r rearchamber. the rearchamber of a 1850horn is just about 70L, base you'r design off of that and the drivers ment for the 1850horn to get you started.


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Previously known as NeverWinter

Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist


Posted By: al_x
Date Posted: 19 March 2006 at 1:12pm

how about this.... bigger horn mouth.



Posted By: ceharden
Date Posted: 19 March 2006 at 3:44pm
Um, it's getting a bit big!


Posted By: Heathrow_B_line
Date Posted: 19 March 2006 at 4:08pm

isnt that nearly as big as a lab?

 



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Produce a killer sound. Take no prisoners.


Posted By: norty303
Date Posted: 19 March 2006 at 4:24pm
Your horn path appears to tighten and expand in different sections too

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My laser stuff: http://www.facebook.com/SubsonicSystems" rel="nofollow - Frikkin Lasers


Posted By: al_x
Date Posted: 19 March 2006 at 5:11pm

Originally posted by ceharden ceharden wrote:

Um, it's getting a bit big!

yeh thats what i thought.

its just a very first idea tho. i did it on paint in 5 minutes

back to the 'drawing board'



Posted By: Jay Lawless
Date Posted: 19 March 2006 at 11:56pm
try something like this, though maybe not as many lines but something simular. try a HxD of 90.25cm high and 90.25cm deep. and also try a width of about 76.2-76.25cm, that should give you plenty of room.





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Previously known as NeverWinter

Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist


Posted By: Mircea Bartic
Date Posted: 20 March 2006 at 2:56am
I see a whole lot of wasted space in there...

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general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research" rel="nofollow - http://www.facebook.com/nexus.acoustics.research

Ex Nexus_3


Posted By: mykey
Date Posted: 20 March 2006 at 3:40am

if thats your design! i wouldnt use the word sub!!

and the mouths to small.



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......just all them hanging there like giant bananas.



Posted By: Jay Lawless
Date Posted: 20 March 2006 at 3:42am
Originally posted by Nexus_3 Nexus_3 wrote:

I see a whole lot of wasted space in there...


exactly why i said not to really go by those folds.

personaly i think it's a little much... but hey, who ever said you couldn't try you know...




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Previously known as NeverWinter

Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist


Posted By: Jimbo
Date Posted: 20 March 2006 at 11:44am

Do your simulations, decided on your compromises and when your satisfied, build a prototype.  This being said from someone who is in this as a hobbie.  Building them is more than half the fun.  If size doesn't matter (depends on who you talk to), why not?

If you have access to AutoCAD, Graeme has a very cool program for doing horn foldings on his sight.

Jim



Posted By: levyte357
Date Posted: 20 March 2006 at 2:47pm
Originally posted by ceharden ceharden wrote:

Um, it's getting a bit big!


Maybe we should spec required freq resp, and then arrive at the best way of acheiving it.

I personally think a WSX would be a good design starting point,

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Did have plan for WSX with internal dimensions here, but edited it
out so speakerplans.com doesn't get slapped for
encouraging copyright theft.. WSX internal http://hem.passagen.se/sajberrapid/WSX/WSX1.jpg - here
SNIP
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but with simpler driver mounting, access plate heatsinking, sensible 1850 compatible rear horn chamber, resulting in a final design with 8ft+ horn length, that does 38hz to 150 "flat", without over excursing driver. I wouldn't mind carting 4 of these around if I knew I was guaranteed 38hz, without ridiculous eq or blowing a few xmechs/xmax's every gig.
 

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"Who am I? I'm the guy who does his job.. You must be the other guy".


Posted By: al_x
Date Posted: 20 March 2006 at 3:46pm

@norty303 - as regards to your comment about the horn getting largaer and then smaller, i have made some adjustments. added about 250-300 mm to the height and changed the folds abit



Posted By: Jimbo
Date Posted: 20 March 2006 at 5:05pm

Have you modeled this on Hornresp yet?  Need to make sure your heading in the right direction before working on the folds.

If you have, I could have a go at the folds in AutoCAD for you.

Jim



Posted By: al_x
Date Posted: 20 March 2006 at 5:37pm
Originally posted by Jimbo Jimbo wrote:

Have you modeled this on Hornresp yet?  Need to make sure your heading in the right direction before working on the folds.

If you have, I could have a go at the folds in AutoCAD for you.

Jim

no. i am a complete novice and just doing this as a bit of fun.

what would be involved in modelling it on horn response? if you could do the auto cad and what have you, i would be very grateful.



Posted By: Jimbo
Date Posted: 21 March 2006 at 11:20am

Hornresp is pretty simple once you understand the inputs.  Search the forum on it and you'll come accross a lot of good info (including where to get it).

Jim



Posted By: Jay Lawless
Date Posted: 23 March 2006 at 4:47pm
Originally posted by 12345 12345 wrote:

Originally posted by Jimbo Jimbo wrote:

Have you modeled this on Hornresp yet?  Need to make sure your heading in the right direction before working on the folds.

If you have, I could have a go at the folds in AutoCAD for you.

Jim

no. i am a complete novice and just doing this as a bit of fun.

what would be involved in modelling it on horn response? if you could do the auto cad and what have you, i would be very grateful.



you'l never know if you'r horn is good at all intill you input it into hornresp. intill then you, nor any of us will be able to tell you that it's worth trying out. the drawing is looking better, but theres no inputs to go by. once you learn hornresp it should be easy to help you out after that. plus by supplieing atleast rough measures *incase you want to keep the design for copyright reasons* it will help others try to tweak the design slightly to help increase or decrease certain aspects of the design.


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Previously known as NeverWinter

Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist



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