front horn designs - post your results / pics - Page 2

MCH · 29th August 2005, 03:37 PM

Well you could cut rings out of 3/4' MDF and stack them (by glueing) to your rough shape. You then sand down to your final shape and desired thickness. MDF sands very well. For any imperfections or enhancements you could use bondo. I've made hive shaped speaker cabs this way.

Newest AR.diy look...(Pics)

qi · 29th August 2005, 03:37 PM

Lightweight concrete is another option.

Mix 1 lb of concrete with 1 lb of perlite (6 to 1 volume ratio)...

http://www.greenhomebuilding.com/pumicecrete.htm#LWC

rcavictim · 29th August 2005, 04:10 PM

OK, making a horn from Cellular Lightweight Concrete (ground up cell phones). Wouldn't that ring?

AuroraB · 29th August 2005, 04:41 PM

Yes.... styro and polyester is generally a no-no combination...
Making a mold out of chicken netting and plaster is feasible..
I think "carpenter" ( or Jon Inlow ??) had a very good description on his web pages ( along with the DIY heatsinks), but the pages have gone, and he hasn't been on the forum for a couple of years, I think.........

qi · 29th August 2005, 04:51 PM

Quote:

Originally posted by rcavictim
My experience using styrofoam and polyester resin was not good. The styrofoam dissolved.

Correct. You need to use EPOXY (not polyester) resin with hotwire / foam construction.

Quote:

I may offer to bang these out as a service to audiophile DIY'ers when I can finish the tooling.

That would be BLEEPing awesome

qi · 29th August 2005, 06:00 PM

Quote:

Originally posted by rcavictim
OK, making a horn from Cellular Lightweight Concrete (ground up cell phones). Wouldn't that ring?

Certainly for me!

What a great way to get people off those obnoxious little contraptions

qi · 29th August 2005, 06:05 PM

Quote:

Originally posted by MCH
Well you could cut rings out of 3/4' MDF and stack them (by glueing) to your rough shape. You then sand down to your final shape and desired thickness. MDF sands very well. For any imperfections or enhancements you could use bondo. I've made hive shaped speaker cabs this way.

Newest AR.diy look...(Pics)

Nice designs!

I've thought of doing essentially the same thing but with foam core (and then glassing it)

qi · 29th August 2005, 06:11 PM

And let's not forget Papercrete

http://www.greenhomebuilding.com/papercrete.htm

...a great way to get rid of those Sunday papers -- make speakers out of them!

bqc · 25th September 2005, 04:27 AM

Here is my horn design, tractrix 150hz, loaded with fostex fe206 , sound wonderful, notice the mold I made, by cutting 1/2" square pieces with correct dimension, stack them up, screw them together, then put plaster over them till then smooth out, paint the plaster, put roofing paper down then start put down 3/4 " thick plywood boards, glue them together, when dry, pull it out, and voila a front horn. The mold is 25 " X25" at the mouth
4.25 " X 4.25" at the throat and is 22" long and weigh about 100 lbs. I am thinking of selling the mold. Since it is so heavy, I prefer pick up only. If no one is close enough to Cary,NC then I will consider shipping to US only and even then, I was thinking of removing some of piece from the throat until the throat area is enlarge to about 7.5" which is big enough for a 8" driver like the Fostex 206 and that should lighten it abit.

bqc · 25th September 2005, 04:29 AM

here is the picture of the horn made from the mold

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29th August 2005, 03:37 PM	#11
MCH diyAudio Member Join Date: Mar 2002	Well you could cut rings out of 3/4' MDF and stack them (by glueing) to your rough shape. You then sand down to your final shape and desired thickness. MDF sands very well. For any imperfections or enhancements you could use bondo. I've made hive shaped speaker cabs this way. Newest AR.diy look...(Pics)

29th August 2005, 03:37 PM	#12
qi diyAudio Member Join Date: Oct 2003 Location: .	Lightweight concrete is another option. Mix 1 lb of concrete with 1 lb of perlite (6 to 1 volume ratio)... http://www.greenhomebuilding.com/pumicecrete.htm#LWC

29th August 2005, 04:10 PM	#13
rcavictim diyAudio Member Join Date: Jun 2004 Location: Cool end of a soldering iron NW of Toronto	OK, making a horn from Cellular Lightweight Concrete (ground up cell phones). Wouldn't that ring?

29th August 2005, 04:41 PM	#14
AuroraB diyAudio Member Join Date: May 2001 Location: Norway, -north of the moral circle..	Yes.... styro and polyester is generally a no-no combination... Making a mold out of chicken netting and plaster is feasible.. I think "carpenter" ( or Jon Inlow ??) had a very good description on his web pages ( along with the DIY heatsinks), but the pages have gone, and he hasn't been on the forum for a couple of years, I think.........

29th August 2005, 06:11 PM	#18
qi diyAudio Member Join Date: Oct 2003 Location: .	And let's not forget Papercrete http://www.greenhomebuilding.com/papercrete.htm ...a great way to get rid of those Sunday papers -- make speakers out of them!