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"Modular Horn" by Mr Punisher?

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mykey View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mykey Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2009 at 4:45am
be careful if you're going to build something like this
 
the energy levels are very high, especially with a horn that size
 
so expect some rattling, unless you BOLT them together, and after a few gig's you'll get tired of it
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Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote H... Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2009 at 6:59am
Bolts / lock nuts / neopean (sp?) gasket................... or just make them as one a big berther for the year 2009!
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tomschute View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tomschute Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2009 at 10:49am
Out to lunch... stableaudio@hotmail.co.uk
www.stableaudio.co.uk
Speaker Building Services
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boycey View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote boycey Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2009 at 1:13pm
just so everyone else can have a play, the data i got was:

Vrc = 120L - volume of driver
Vtc = 38L
S1 = 670cm^2
con = 77cm
S2 = 1290cm^2
exp = 91cm
S3 = 2655cm^2
exp2(or L34 or whatever it's called) = 69cm
S4 = 4585cm^2

sorry i can't post pics, i think i may have screwed up the length of the horn- it may be a bit longer and i can't help feeling that the mouth could have made more use of the front footprint? the lack of a "corner piece" at the first fold theoretically shortens the horn and increases Vtc quite a bit, perhaps it'd be worth playing with that too. finally, as i'm on a sh*te pooter i couldn't get the thiele/small for the recommended driver and the void gave a very lumpy response. even if it does look like it's worth playing with.
the only thing more dangerous than a person who doesn't give a f**k is a person who gives a sh*t.
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darkmatter View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote darkmatter Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2009 at 4:47pm
Haha I've just realized that the triangle in the bottom box isn't part of the horn, ignore my measurements then lol.

I was thinking it was a bit odd that the horn path would enter the second box so soon, I should've known better than to think that Walt wouldn't have thought of this!
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boycey View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote boycey Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2009 at 6:00pm
lol!

can you or anyone else post the necessaries from the 18sound woofer that's recomended?
the only thing more dangerous than a person who doesn't give a f**k is a person who gives a sh*t.
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FlipC View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FlipC Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2009 at 10:23am
18LW1400
Sd 1225
Cms 1.39E-04
Mmd 164.97
Re 5
Bl 24.41
Rms 5.13
Le 2.38

And the HR #s posted cant be right cause that is only 500 Lt. One would assume this thing is 900 plus ?

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FUBARD303 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FUBARD303 Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2009 at 5:21pm
As taken from www.eighteensound.it looking at the specs page for the 18lw1400 (walt's recomended driver)
I'm not familiar with hornresp or anything else so I'll post everything I see.

Fs.    31Hz
Re.   5 Ohm
Sd.   0.1225 sqm
Qms 7.2
Qes. 0.31
Qts. 0.29
Vas. 297 lt.
Mms 190gr
BL.    24.7 Tm
Xmax. (+-) 9mm
Le1kHz.   2.3 mH
1W@1m(1/2sp). 96.5 dB

Hope this helps.
THANX!
"Always look on the bright side of life" -Brian
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tommysb Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2009 at 7:32pm
Originally posted by FUBARD303 FUBARD303 wrote:

I really need to sit down n learn hornresp. I so wish I had a graph of theese guys with the reccomended. 18sound 18lf1400 in em. Now my stupider question is...

If the horn resonates down to 35hz when laired and lower when I build all 4 of em, won't the depth be stopped by my driver's 31hz resonant peak? I mean one IS supposed to cut it just above the RP right?


That'll be the driver's free air resonance. If you stick a horn in front of it, that's a lot of air, all of which has mass. If you imagine glueing weights to the cone, that would bring its Fs down.

The same thing should happen with the mass of air in a horn, so the Fs of the driver will effectively be lower than 31Hz.
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FUBARD303 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FUBARD303 Quote  Post ReplyReply Direct Link To This Post Posted: 29 January 2009 at 3:14pm
Juicy! :) THANX tommysb.

I can't wait to see a curve on this thing. Should be in the brown range, LOL!
"Always look on the bright side of life" -Brian
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mykey View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mykey Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2009 at 2:44pm

I was bored



my bin (DEMO1) black line, walts modular grey


just shows you what you can get from a smaller cabWink 48w 48 d 24 h


Edited by mykey - 30 January 2009 at 4:21pm
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darkmatter View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote darkmatter Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2009 at 6:06pm
niceSmile what's the compression ratio like in yours? is it the same picture when you plot more bins in a stack?
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