"Modular Horn" by Mr Punisher? |
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mykey
Old Croc Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680 |
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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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H...
Young Croc Joined: 21 July 2008 Location: UK Status: Offline Points: 1164 |
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Bolts / lock nuts / neopean (sp?) gasket................... or just make them as one a big berther for the year 2009!
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tomschute
Old Croc Joined: 15 May 2006 Location: Mid Wales Status: Offline Points: 1817 |
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Out to lunch... stableaudio@hotmail.co.uk
www.stableaudio.co.uk Speaker Building Services |
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boycey
Old Croc Joined: 25 June 2006 Location: Manor House Status: Offline Points: 1612 |
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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. |
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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
Old Croc Joined: 26 February 2005 Location: LDN Status: Offline Points: 2425 |
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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
Old Croc Joined: 25 June 2006 Location: Manor House Status: Offline Points: 1612 |
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lol!
can you or anyone else post the necessaries from the 18sound woofer that's recomended? |
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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
Young Croc Joined: 25 October 2007 Status: Offline Points: 654 |
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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
Registered User Contentiously righteous Joined: 29 September 2008 Location: Allup Inyo MOUF Status: Offline Points: 120 |
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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! |
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"Always look on the bright side of life" -Brian
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tommysb
Registered User Joined: 24 April 2006 Location: Finland Status: Offline Points: 1036 |
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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
Registered User Contentiously righteous Joined: 29 September 2008 Location: Allup Inyo MOUF Status: Offline Points: 120 |
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Juicy! :) THANX tommysb.
I can't wait to see a curve on this thing. Should be in the brown range, LOL! |
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"Always look on the bright side of life" -Brian
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mykey
Old Croc Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680 |
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darkmatter
Old Croc Joined: 26 February 2005 Location: LDN Status: Offline Points: 2425 |
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nice 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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