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 23rd January 2018, 01:12 AM #21 wg_ski   diyAudio Member   Join Date: Oct 2007 How on earth do you expect to get 60 cubic feet of horn out of two sheets of plywood? My 32 cubic foot "DH horn" takes 3.25 (13 sheets builds 4 boxes). And very little scrap. There is more than one full sheet just for all the innards. It was designed specifically to fully utilize 4x8 sheets and pack into a horse trailer. You can cut the outer 4x2x3 (24 cubic foot) FLH box out of two sheets, but I'll be surprised if you can get the innards out of that last half sheet, considering you want a 96 inch path. A well stocked scrap pile might help. The box would be big enough to get useful 40 hz out of, but would be more like 6dB down in singles. You might want two.
 23rd January 2018, 02:02 AM #22 StainlessSteve   diyAudio Member     Join Date: May 2015 Location: Pennsylvania I'm going to edit the post to say 3.333 (repeating) sheets. Last edited by StainlessSteve; 23rd January 2018 at 02:05 AM.
weltersys
diyAudio Member

Join Date: Jan 2008
Location: Florida
Quote:
 Originally Posted by StainlessSteve I'm going to edit the post to say 3.333 (repeating) sheets.
Steve,
Might as well edit "under 60 square feet external" to "under 60 cubic feet", and specify the SPL output you desire in half space while you are in the edit mood ;^).

globalplayer
diyAudio Member

Join Date: Oct 2014
Location: =)
Quote:
 Originally Posted by StainlessSteve I'm going to edit the post to say 3.333 (repeating) sheets.
Wise decision.
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 23rd January 2018, 09:02 AM #25 chris661   diyAudio Member     Join Date: Feb 2008 Location: Sheffield 60 cubic feet is 1680L. That's not a small box, and will likely need more than 3 sheets of wood. Anyway, with a big front-loaded horn, you can do it. I used a decent RCF 12" driver in my sims since that's what I happened to have loaded in Hornresp. This achieves 129dB from 43Hz upwards from a single 12" driver, in a box a smidge over 3000L net. With wood added for folding etc, it might end up 3500L. Vrc: 56.16 Lrc: 41.50 Vtc: 1345.55 Atc: 530 S1: 132.5 S2: 38436.24 L12 (Hyp): 420.77 Good luck folding it. IMO, the specs you're hoping to achieve are borderline ridiculous. For a 12" driver to do that SPL in a sealed box, it'd need a little more than 4" of one-way travel. A big horn gets you some leverage, but you're looking at 3 cubic metres of horn. By the time you've bought all that wood, you could've got a nice pair of 15" drivers, a few kilowatts of amplifier, and done the same thing in less than 200L. Chris
TNT
diyAudio Member

Join Date: Apr 2003
Location: Sweden
Quote:
 Originally Posted by Doppler9000 Does anyone else find it rude when someone starts a post with "Um", as if they are questioning the intelligence or diligence of the person they are responding to? If they are asking for free help from a stranger, perhaps something like "Do you have measurements you could share?" might be more polite.
No, more like that the person answering needs to think a bit before the answer. This is how it works in real conversation right? Instead of becoming dead silent after a question, the respondent indicates that the question is received but is not ready to answer. The Um is just the written variant. Not necessary but again, indicates that the answer took some time to identify. Rudeness usually comes out much more clear -

//
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StainlessSteve
diyAudio Member

Join Date: May 2015
Location: Pennsylvania
Quote:
 Originally Posted by chris661 60 cubic feet is 1680L. That's not a small box, and will likely need more than 3 sheets of wood. Anyway, with a big front-loaded horn, you can do it. I used a decent RCF 12" driver in my sims since that's what I happened to have loaded in Hornresp. This achieves 129dB from 43Hz upwards from a single 12" driver, in a box a smidge over 3000L net. With wood added for folding etc, it might end up 3500L. Vrc: 56.16 Lrc: 41.50 Vtc: 1345.55 Atc: 530 S1: 132.5 S2: 38436.24 L12 (Hyp): 420.77 Good luck folding it. IMO, the specs you're hoping to achieve are borderline ridiculous. For a 12" driver to do that SPL in a sealed box, it'd need a little more than 4" of one-way travel. A big horn gets you some leverage, but you're looking at 3 cubic metres of horn. By the time you've bought all that wood, you could've got a nice pair of 15" drivers, a few kilowatts of amplifier, and done the same thing in less than 200L. Chris

Last edited by StainlessSteve; 23rd January 2018 at 04:43 PM.

 23rd January 2018, 08:58 PM #28 manninen   diyAudio Member     Join Date: Jul 2014 Easy sim. there is room for those in north korea border
 23rd January 2018, 09:37 PM #29 StainlessSteve   diyAudio Member     Join Date: May 2015 Location: Pennsylvania Now could you (the forum) fold it into a <60 cubic foot box/rectangle?
 24th January 2018, 03:06 AM #30 wg_ski   diyAudio Member   Join Date: Oct 2007 If you insist on doing this, you might want to stop at S4, and make L45 a separate flare extension that can be latched on. Take it off and the low end drops a bit, and only use it when you really want the SPL. And it is a lot easier to fold a 3 segment box.

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