Fostex kit...

ERICSPEEd · 8th December 2004, 07:49 AM

I would like to build this...

FE206E recomended enclosure.

One problem is that the design is built around 21mm plywood. I don't know if I can get the same size thickness here in the US. It wouldn't be much trouble to alter the design to make use of 1'' thick plywood.

What about MDF (not partical board)?

Thanks in advance for your comments and suggestions!

ERICSPEEd · 8th December 2004, 09:17 AM

I seemed to forget to ask my question... which is...

Should I use quality void-free plywood or MDF instead?

THANKS

MPM · 8th December 2004, 03:59 PM

You'll probably get more replies in the full range section.

simon5 · 8th December 2004, 08:33 PM

Void free plywood is a bit better and lighter, but price is higher.
Then MDF is a bit worse, dusty and heavy, but price is lower.

If you use 1 inch plywood, once sandblasted each side, probably 21mm thick?

chipco3434 · 8th December 2004, 09:58 PM

I built one of those last spring using 3/4" mdf. If you look at the cut list from the optimized 4x8 sheet, you will note that only a couple dimensions need to be changed. If I recall correctly, the only dimensions that need to be changed were the two sides in height and depth. Everything els fits "in between" the sides.

The problem with this plan is to be sure to design a way to add and subtract stuffing.

By the way, they're heavy. Very heavy.

ERICSPEEd · 9th December 2004, 05:38 AM

From what I've been reading plywood seems to be the way to go.

I found a place that has 14-ply baltic birch. I guess I'll get some of that.

Thanks for all the replys!

chipco3434 · 9th December 2004, 02:08 PM

If the ply has to be shipped to you, you might want to consider sandwiching the ply with two pieces of 3/4 mdf. That way the mdf takes a beating and not the ply. Each speaker uses two sheets of 4x8. You could use the mdf in the middle where it doesn't show and the ply on the outside.

Greg B · 9th December 2004, 09:22 PM

21mm plywood is equivalent to 7/8" plywood. It isn't that uncommon. (7/8" ply is really 27/32")

Alternatively, 1/2" mdf or particle board could be laminated to 3/8" plywood. Cascamite plastic resin type glue works well for this. Arguably, that would give you the best of both worlds.

As an added benefit, this may allow you to budget for fancier walnut faced appleply or the like.

I would be very careful about using 3/4" ply and 'adjusting'. Very small changes in horn dimensions can make a big difference, IME.

GB

8th December 2004, 08:33 PM	#4
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	Void free plywood is a bit better and lighter, but price is higher. Then MDF is a bit worse, dusty and heavy, but price is lower. If you use 1 inch plywood, once sandblasted each side, probably 21mm thick? __________________ DIYaudio for President !

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8th December 2004, 09:17 AM	#2
ERICSPEEd diyAudio Member Join Date: Dec 2003 Location: Head of the Lakes	I seemed to forget to ask my question... which is... Should I use quality void-free plywood or MDF instead? THANKS

8th December 2004, 03:59 PM	#3
MPM diyAudio Member Join Date: Sep 2004 Location: Alabama	You'll probably get more replies in the full range section.

8th December 2004, 09:58 PM	#5
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	I built one of those last spring using 3/4" mdf. If you look at the cut list from the optimized 4x8 sheet, you will note that only a couple dimensions need to be changed. If I recall correctly, the only dimensions that need to be changed were the two sides in height and depth. Everything els fits "in between" the sides. The problem with this plan is to be sure to design a way to add and subtract stuffing. By the way, they're heavy. Very heavy.

9th December 2004, 05:38 AM	#6
ERICSPEEd diyAudio Member Join Date: Dec 2003 Location: Head of the Lakes	From what I've been reading plywood seems to be the way to go. I found a place that has 14-ply baltic birch. I guess I'll get some of that. Thanks for all the replys!

9th December 2004, 02:08 PM	#7
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	If the ply has to be shipped to you, you might want to consider sandwiching the ply with two pieces of 3/4 mdf. That way the mdf takes a beating and not the ply. Each speaker uses two sheets of 4x8. You could use the mdf in the middle where it doesn't show and the ply on the outside.

9th December 2004, 09:22 PM	#8
Greg B diyAudio Member Join Date: May 2004 Location: Los Angeles, California	21mm plywood is equivalent to 7/8" plywood. It isn't that uncommon. (7/8" ply is really 27/32") Alternatively, 1/2" mdf or particle board could be laminated to 3/8" plywood. Cascamite plastic resin type glue works well for this. Arguably, that would give you the best of both worlds. As an added benefit, this may allow you to budget for fancier walnut faced appleply or the like. I would be very careful about using 3/4" ply and 'adjusting'. Very small changes in horn dimensions can make a big difference, IME. GB

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