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Old 26th September 2012, 12:26 PM   #31
IG81 is offline IG81  Canada
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I almost always build from BB-ply. Oui, contreplaqué en effet! I did use MDF to make some MLTL's a while back, with the aim to cut cost, never again.

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Old 26th September 2012, 12:50 PM   #32
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What was the problem exactly?
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Old 26th September 2012, 02:08 PM   #33
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the problem was acoustically speaking, what is better/ MDF or Baltic Birch?

I came here for the entertainment (of seeing what works and what doesn't and maybe a graph or chart thrown in) and information (old threads are nice, but up to date info is better) -- at least I thought that the great debate would be resolved in this thread.

Right now, skip the acoustics -- I am leaning towards BB because of reading about the MDF dust (if I ever build some speakers...).
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Old 26th September 2012, 02:26 PM   #34
tsiros is offline tsiros  Greece
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MDF dust... hm... well, if you coat/paint it, i don't see the issue?
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Old 26th September 2012, 02:43 PM   #35
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Quote:
Originally Posted by tsiros View Post
MDF dust... hm... well, if you coat/paint it, i don't see the issue?
I doubt paint will do much when the dust starts flying as the boards are being cut or shaped on a table saw, circular saw, router, or CNC machine. The paint will probably come right off as that happens.

Last edited by overtheairbroadcast; 26th September 2012 at 02:44 PM. Reason: editted for spelling
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Old 26th September 2012, 02:54 PM   #36
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Quote:
Originally Posted by overtheairbroadcast View Post
This ought to be informative.
Nope.
Quote:
Originally Posted by Keriwena View Post
Or redundant.
Yup.
Quote:
Originally Posted by chrisb View Post
just build a pair from Baltic Birch (or equivalent)- identical to something you already have in MDF and decide for yourself
Best advice.
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Old 26th September 2012, 02:55 PM   #37
IG81 is offline IG81  Canada
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Quote:
Originally Posted by doubtingthomas View Post
What was the problem exactly?
For me, the huge mess created by working on this. It also does not play in MDF's favor that I enjoy a simple, stained or not, finish straight on the BB-ply, with end-laminations showing. MDF did work well for the box in the end, but I just enjoy working with plywood a bunch more.

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Old 26th September 2012, 03:18 PM   #38
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Dang it Cal, I thought that would be informative (well it was with the dust issue), but seeing you have built a few speakers in your time, what are your thoughts on MDF vs. BB vs. TB for sound reproduction?

(TB for those uninitated is Tool Box... seriously, check out Cal's pictures -- if nothing else, they will give you a good idea on what you materials can build with).

Last edited by overtheairbroadcast; 26th September 2012 at 03:19 PM. Reason: spelling and getting back to the topic I added "for sound reproduction"
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Old 26th September 2012, 03:47 PM   #39
badman is offline badman  United States
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Apart from the fine MDF dust (much finer than ply sawdust) which gets everywhere and is NASTY, MDF tends to swell on edges, because it has so many gaps- they use the least glue they can. If more glue were used (resulting in heavier product) it'd be stronger and more expensive and heavier and probably better overall for speaker cabinets.

As is, it screams "cheap" to me. Add in the working properties (which I hate) and it's something I'd rather use OSB than.
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Old 26th September 2012, 03:55 PM   #40
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I think MDF or particle board is ok for shelf bracing or the TL part of a TL or the steps in a Nagaoka horn but for the shell, I use plywood. Regardless of what material is better from a scientific point of view, the plywood just sounds better to me.

MDF is nice to cut though. After bucking the plywood, MDF just seems to go through the blade like butter.
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