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Modified 186 horn build pics - more added 10/06/09
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Wrighty View Drop Down
Old Croc
Old Croc


Joined: 17 April 2004
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Points: 1801 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Wrighty Quote  Post ReplyReply Direct Link To This Post Posted: 05 January 2009 at 9:47pm
Yes, I realise that. There are some plots on here somewhere which I did at the design stage, showing that the 18LW1400 in the narrow cab is at least as good as the PD186 in the full width cab, with added benefits such as greater Xmax and Xmech.

I left the bottom closing piece out of the rear chamber to make up for the loss of volume there - this gave the best plot in Hornresp.

If you look at the BL factors of the 18LW1400, PD186 and PD1850, the 18LW1400 sits somewhere in between the PDs, hence the optimum rear chamber size being somewhere between the 186 horn and the 1850 horn. That's my understanding of it anyway!
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Wrighty View Drop Down
Old Croc
Old Croc


Joined: 17 April 2004
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Points: 1801 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Wrighty Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2009 at 2:11pm
Ok, plots here. Standard 636mm wide 186 horn, loaded with PD186 in grey. My 536mm wide 186 horn without closing piece in rear chamber, loaded with Eighteen Sound 18LW1400 in black. One cab, half space, 1w@1m.



4 cabs (again, 636mm PD186 in grey, 536mm 18LW1400 in black):




Edited by Wrighty - 06 January 2009 at 2:15pm
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imageoven View Drop Down
Old Croc
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Joined: 28 March 2007
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Points: 2163 		Post Options Post Options   Thanks (0) Thanks(0)   Quote imageoven Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2009 at 3:46pm
I like the handles on the hatch, combined with the wheels - wish I'd done it like that on my 1850's. good work.
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Wrighty View Drop Down
Old Croc
Old Croc


Joined: 17 April 2004
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Points: 1801 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Wrighty Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2009 at 3:49pm
Yeah, I borrowed that idea from EV MTL-1X bins which I used to work with on a regular basis. Saves store and van space, not having 4 castors sticking out the back of each bin!

Still not got round to putting the metal bar handles in, doing final sand and painting them - garage is now full of stuff again and the weather has been too wet and/or cold :(
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FUBARD303 View Drop Down
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Points: 120 		Post Options Post Options   Thanks (0) Thanks(0)   Quote FUBARD303 Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2009 at 2:40pm
Mr novice here. Im here cause I searched for the driver your using. Stupid question possibly but why would you put these in horns when you can get +20spl in dual reflex boxes? Also have you seen the modular horn plans on speakerstore.nl? Same guys that designed punnisher made a horn for the 18sound. Looks interesting.
"Always look on the bright side of life" -Brian
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Wrighty View Drop Down
Old Croc
Old Croc


Joined: 17 April 2004
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Points: 1801 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Wrighty Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2009 at 2:58pm
Erm, ok. Those plots are for 1W @ 1m. So that driver in that folded horn enclosure will produce 105dB with 1W input power @ 1m distance. That driver in a single reflex box will produce 98dB with 1W input power @ 1m distance, so a double reflex enclosure will produce about 101dB @ 1W @ 1m.

If we're talking about maximum continuous power (which I suspect you are), the horn loaded enclosure will produce about 136dB @ 1400W @ 1m, whereas the reflex will be about 128dB @ 1400W @ 1m.
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FUBARD303 View Drop Down
Registered User
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Points: 120 		Post Options Post Options   Thanks (0) Thanks(0)   Quote FUBARD303 Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2009 at 3:59pm
Ops, new guy mistake. I was comlaring your 1w to my 1400w, Like I said...

Admirable handywork though, a true craftsman indeed. Hope mine should turn out half as nicely.

So... If I were to build some of my own (without storage space restricions) would you still reccomend the -100mm ?
"Always look on the bright side of life" -Brian
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Wrighty View Drop Down
Old Croc
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Build them to the plan - the simulations are very similar.
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Points: 112 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mhtplsh Quote  Post ReplyReply Direct Link To This Post Posted: 21 May 2009 at 5:14am
Originally posted by Wrighty Wrighty wrote:

Ok, plots here. Standard 636mm wide 186 horn, loaded with PD186 in grey. My 536mm wide 186 horn without closing piece in rear chamber, loaded with Eighteen Sound 18LW1400 in black. One cab, half space, 1w@1m.



4 cabs (again, 636mm PD186 in grey, 536mm 18LW1400 in black):




Can u post picture of the input parameter window of Hornresp of the above graphs?
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Wrighty View Drop Down
Old Croc
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Joined: 17 April 2004
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Points: 1801 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Wrighty Quote  Post ReplyReply Direct Link To This Post Posted: 21 May 2009 at 10:10am
PD186, standard 636mm wide 186 horn:


18LW1400, modified 536mm wide 186 horn:



Edited by Wrighty - 21 May 2009 at 10:10am
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breakdabeat pete View Drop Down
Young Croc
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Points: 753 		Post Options Post Options   Thanks (0) Thanks(0)   Quote breakdabeat pete Quote  Post ReplyReply Direct Link To This Post Posted: 21 May 2009 at 10:15am
been looking for the 186 input param for ages
nice one
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Old Croc
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Points: 1801 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Wrighty Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2009 at 10:56pm
I finally got round to making a couple of jigs for the handle cutout and rebate, to use with a 12.5mm cutter and 30mm collar on my DeWalt router. Here are some pics...

Handle cutout jig:




Used router just to skim the surface, giving me a guide for the next step:


Cut out roughly with jigsaw, leaving about 2-3mm inside the router mark, for speed and to prolong life of router bit (top tip from Insomnia, I think):


Edges cleaned up with router:




Jig number 1 removed, jig number 2 (for rebate) fixed in its place:


Rebated to a depth of 5mm to allow for thickness of handle + screwheads:


Jig removed and edges cleaned up with a bit of sandpaper:


Handle placed in rebate:


2 handles in place (and a lot of sawdust):


Finished for the day - 2 cabs with 4 handles in each. Just the other 2 to do now!
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