186 Horns - MDF or Ply

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   Hello.

I am planning on building some 186  horns and was wondering,  would it make a difference if i used 18mm ply for the outer panels and 18mm MDF for the inside panels?
any info greatly appreciated.

Cheers!

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Notez Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 16 November 2006 Status: Offline Points: 3	Post Options Post Reply Quote Notez Report Post Thanks(0) Quote Reply Topic: 186 Horns - MDF or Ply Posted: 26 November 2006 at 4:20pm
	Hello. I am planning on building some 186 horns and was wondering, would it make a difference if i used 18mm ply for the outer panels and 18mm MDF for the inside panels? any info greatly appreciated. Cheers!

Insomnia Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 06 September 2005 Status: Offline Points: 1721	Post Options Post Reply Quote Insomnia Report Post Thanks(0) Quote Reply Posted: 26 November 2006 at 4:44pm
	dont understand mate make a difference in what way? what r u trying to acheive by doing this?

Nigey-C Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 06 February 2006 Location: Grimsby... FISH Status: Offline Points: 1342	Post Options Post Reply Quote Nigey-C Report Post Thanks(0) Quote Reply Posted: 26 November 2006 at 7:01pm
	use ply all round... would be much easier.. weigh less and would last longer..

al_x Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 12 February 2006 Status: Offline Points: 838	Post Options Post Reply Quote al_x Report Post Thanks(0) Quote Reply Posted: 27 November 2006 at 7:00pm
	maybe the acoustics would be improved?

specialjustin Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 18 November 2006 Status: Offline Points: 555	Post Options Post Reply Quote specialjustin Report Post Thanks(0) Quote Reply Posted: 27 November 2006 at 7:23pm
	Yes it will make a difference, but how much i don't know. One thing is for sure, it's going to make a hard build, harder. I don't think its worth the trouble. You sure 18mm for both, thats like a double 186 horn with only one driver in it, if your hell bent on it at least try 9mm of each and save your back.

specialjustin Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 18 November 2006 Status: Offline Points: 555	Post Options Post Reply Quote specialjustin Report Post Thanks(0) Quote Reply Posted: 28 November 2006 at 2:51am
	God i'm a moron, didn't read your post properly. Yea as Nigey c says, go 100% ply.

COWFOOT Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 26 September 2005 Status: Offline Points: 1088	Post Options Post Reply Quote COWFOOT Report Post Thanks(0) Quote Reply Posted: 28 November 2006 at 9:11am
	Some audiophiles use ply and mdf sandwiching roofing felt.Makes for very dead heavy structure.

jethrocker Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 07 June 2006 Location: Chiapas, Mexico Status: Offline Points: 1942	Post Options Post Reply Quote jethrocker Report Post Thanks(0) Quote Reply Posted: 28 November 2006 at 2:47pm
	I built my super scoopers as you suggest-birch ply outer panels and mdf internals. I figured it's a good compromise. Saves cash on the MDF internals.. ply is 4o notes a sheet, MDF under 10, and a good few sheets saved over six bins. MDF should also be less resonant. I'm hoping that as the internals are hidden away from knocks that the bins should still live long enough... thinking I should have painted all internals with a sealer though to stop any damp troubles. Downside is extra weight..And working with MDF-cough :(

mykey Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680	Post Options Post Reply Quote mykey Report Post Thanks(0) Quote Reply Posted: 29 November 2006 at 1:23am
	slightly better accoustics and a little cheaper yes

Rich2 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 24 November 2006 Status: Offline Points: 19	Post Options Post Reply Quote Rich2 Report Post Thanks(0) Quote Reply Posted: 29 November 2006 at 6:53am
	I was thinking of doing exactly the same thing to try and keep the cost down. I don't see how it makes the build more complicated though! They're both 18mm, and MDF is slightly easier to work than ply. Edit: Why would it not last as long? The MDF is completely protected. Edited by Rich2 - 29 November 2006 at 6:54am

Nigey-C Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 06 February 2006 Location: Grimsby... FISH Status: Offline Points: 1342	Post Options Post Reply Quote Nigey-C Report Post Thanks(0) Quote Reply Posted: 29 November 2006 at 10:36am
	The damp factor... MDF goes mushy n soggy wen water even gets close to it... unless of course you completely seal each piece of MDF before glueing and screwing.

mobiele eenheid Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1563	Post Options Post Reply Quote mobiele eenheid Report Post Thanks(0) Quote Reply Posted: 29 November 2006 at 11:28am
	Just paint the parts that might get direct contact with water, as you were probably going to do anyway. Unless you're going to put your cabs in the fog all the time there is no need to seal it. Over the years, the only spoiled (untreated) MDF I got was standing directly into the water,or water standing directly on it. Wkr Johan