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Old 16th April 2002, 07:03 PM   #1
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Default PA Horn Sub Design

Here is a PA horn sub I designed and built, measured 142db at 1 meter with a 500 watt Driver. Good response from 32hz-300hz. Will work with about any driver with a mid to low Vas. though specifically designed for the MCM-1875 18" driver. It is a huge semi complex design, but 4 of these will cave your chest in. Feel free to use if you like. I also am looking for the EAW LA-400 design for reference or any PA application horn/manifold loaded subs not found on the net. I have the CV SL-36 design for trade.

Pulse Sub Horn 1
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Old 16th April 2002, 07:52 PM   #2
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Hi,

Good to have another "hornie" around here.

Thanks for posting your design. It looks interesting, especially with such an affordable driver as the MCM. I wonder how it would go with some of the Eminence designs which are available in Australia.....I need some smaller basshorns and I had been thinking along similar lines to yours, but taller, with the throat starting near the centre and following a snail path via the front and top. So far its only a thought excercise.

Have you measured the response, or do you have simulations from AJHorn or Hornresp you could post?

What would you consider as a trade for the SL-36? I used to have it but it was not backed up when a virus crashed my HD.

Cheers
Brett
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Old 16th April 2002, 09:51 PM   #3
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The Sigma 18 by eminence should work well, though I would halve to calculate out the response and parameters. I have tried the design with several drivers (nwx-18100, EVX-18) all yeilding similar results. I think the MCM sounds better than the EV at a Fraction of the cost. I hand calculate everything using my db meter and osciliscope. If you have some good modeling software for horns please educate me. Trial and error gets expensive. I will e-mail you the SL-36 design if you send me your e-mail. I just don't want to publicly post it, copywrited and all. I have a 15" design as well that uses the EV BX15. it is a small horn for a 15 overall dimensions is 18"wide X 24" Deep X 30" tall or round abouts. I will have to search for it and post it. I designed them for a buddy who DJ's outdoor school functions and dances. he uses 4 of them @ 1600 watts and they pound.

Also I have foung that you by using a more smooth transition through the horn (snail like) you essentially are tuning out the the higher 150-300 HZ range. By creating sharper turns you are reflecting the higher wavelengths through the horn instead of losing them on the smooth transition.
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Old 17th April 2002, 12:37 AM   #4
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Default Horn software

First place to look is
http://www.melhuish.org/audio/horn.htm
where there is a lot of general horn info, especially for the DIY types, including hyperbolic/exponential and tractrix calculator applets. There is also a hobbyist forum with a few horn guys, and lots into single fullrange drivers.

A free and excellent horn simulator can be found at
http://www.users.bigpond.com/dmcbean/

AJHorn is a program I have heard good things about, but have yet to use. I might spring the $100 for it soon, as it will do all sorts of boxes and xovers too.
http://www.aj-systems.de/indexe.htm

Another simulator that can do horns is SPEAK, but I know nothing about it.
http://www.gedlee.com/speak.htm

Jeff Robinson's site has lots of designs, many of which were optimised using Hornresp. These are mainly sound reinforcement designs. Plenty to think about there anyway.
http://www.geocities.com/loudspeakerguru/

Sound Practices magazine has an Altec area that contains lots of info on thier theatre and PA designs as well as a heap of cabinet plans.
http://www.soundpractices.com/altec.html

AudioAsylum has a specialist High Efficiency speaker forum with a lot of people there who are very experienced and knowledgable about horn systems, such as and djk who also posts here. Mainly directed towards 'philes but much of the info can be applied to PA, as a lot of the gear people there use is pro gear.
http://www.audioasylum.com/forums/HUG/bbs.html

Another forum there is the Pi speaker forum. Wayne Parnham has developed a lot of easy to build designs, from bookshelves to huge PA gear. I beleive the plans are available for the emailling and requesting of them.
http://www.audioasylum.com/forums/pi/bbs.html

That should keep you busy for a while. I have tons more horn info if you need it.

Cheers
Brett
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Old 17th April 2002, 02:05 AM   #5
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Hello Brett, thanks for all that info - indeed it will take a little time to digest it all.
Do you have any experience with modern line array systems and their bass sections.
Ditto using 4 * 8" drivers as bass section for minitureised portable hireable Line Array setup ?.

Thanks again,
Eric.
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Old 17th April 2002, 09:27 AM   #6
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Mission313,

142db at 1 meter! At what power level was this spl achieved? And which amplifier do you use for the 500 watt driver you have specified. I use EV's DL18W (400 watts) drivers and PAudio 18" which have identical specs to the JBL2141 (600 watts).

Thanks,
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Old 17th April 2002, 02:20 PM   #7
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I Measured 142db with the MCM-1875 driver using a crown K2 amplifier. I was running a tr-909 kickdrum pattern peaking it at 142db at waist level. I built 4 of the cabinets and running 2500 watts at 5 meters I read 136db peak on the spl meter. I think it is pretty respectable considering these cabinents can be built for under $200 a piece. Where as a retail cabinet of similar quality would run upwards of $1200. My goal is to provide low cost solutions to a way overpriced industry. I am currently working on a direct radiating dual 18" speaker with a peak spl of 141db @ 40hz. This cabinet will also use low cost drivers, I am testing with the NWX-18100's right now. Using WinISD it shows that it is possible but, I have not been able to measure it in real life I am playing with box shape now and I think it can be done.
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Old 18th April 2002, 08:44 AM   #8
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Mission313,

Thanks for the info. However, the overall depth of the Horn enclosure which must be more than 28" is not shown in your drawings. Or did I miss something?
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Old 18th April 2002, 09:24 AM   #9
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Mission313,

I have searched through http://www.mcmelectronics.com and have not found the MCM-1875 18" driver specified by you. Can you please provide the link? Thanks.
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Old 18th April 2002, 10:21 AM   #10
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You did not...? Strange. Here's the direct url:
http://www.i-mcm.com/Search/level_5.jhtml;$sessionid$JBQRH1YAAAAAZTW3PUWCFEQ?PRODID=36558&SK UID=35802

(I am afraid you have to copy / paste the whole thing)

Holger
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