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Material choice for open baffle speaker
Material choice for open baffle speaker
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Old 30th October 2017, 07:49 PM   #1
nashbap is offline nashbap  United States
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Default Material choice for open baffle speaker

I am planning on building the Troels Gravesen OBL 15.

Most constructors here seem to favor baltic birch plywood and MDF. While the merits of different plys and MDF have been debated for box speakers is it of equal importance for an open baffle? I am planning on gluing two 3/4" panels together. What material should I use?

Advice appreciated. Thanks.

nash
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Old 30th October 2017, 08:08 PM   #2
scottjoplin is offline scottjoplin  Wales
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Hi, I can't think of any reason one wouldn't use the same materials that would be used for the baffle of a box speaker, maybe thicker or braced since there is no extra rigidity provided by the box
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Old 30th October 2017, 08:56 PM   #3
nashbap is offline nashbap  United States
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I figured that different materials will resonate at different levels and that in a box structure this would be more important.

Is resonance a factor in an open baffle?

nash
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Old 30th October 2017, 09:12 PM   #4
scottjoplin is offline scottjoplin  Wales
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It depends what kind of resonance you mean, a box is a resonant structure, the frequencies set by it's dimensions. As you say all materials have resonance, and their resonance should be minimised in this application. If your OB speaker has any wings or cavity behind the baffle this also will have a resonance
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Old 30th October 2017, 09:32 PM   #5
nashbap is offline nashbap  United States
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If your OB speaker has any wings or cavity behind the baffle this also will have a resonance[/QUOTE]

Good point, thanks.
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Old 30th October 2017, 10:28 PM   #6
MagicBus is offline MagicBus  Greece
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Hi,
Every material has its self-resonance frequency but this becomes an issue if it is excited which is more likely to happen in box speakers because of standing waves. Generally open baffles have to be rigid enough so the driver's cones move relatively to the baffle and not the other way around. I haven't come accross an "audible" baffle but I can confirm that a loosely mounted driver will ring.
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Old 30th October 2017, 11:45 PM   #7
nashbap is offline nashbap  United States
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Thanks.
Troels says he uses baltic birch ply for all his constructions since it has a very high density and does not have to be veneered. Only problem is that buying baltic birch ply here in the US is difficult so I was considering the stuff available at the big box stores such as birch ply and maple ply which I know is not nearly as good as the baltic birch ply. Thats why I posted the query wondering whether my results will be just as good sonically specifically for OB use.

nash
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Old 31st October 2017, 12:31 AM   #8
phase is offline phase  United States
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I would use MDF myself.
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Old 31st October 2017, 12:44 AM   #9
adason is offline adason  United States
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I would not use MDF
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Old 31st October 2017, 06:57 PM   #10
LightBit is online now LightBit  Slovenia
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I would use plywood (not necessary baltic birch) for OB.
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