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Old 10th June 2013, 03:36 AM   #71
zman01 is offline zman01  Bangladesh
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rongon,

The A12 DBR design uses 1 driver/cabinet.

No stranger to long project times - have fun!
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Old 3rd January 2015, 12:16 PM   #72
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Quote:
Originally Posted by Scottmoose View Post
You should be OK with 18mm, so long as it's not any thinner (or thicker than 20mm).

Hi Scott i was just reading some old posts and was curious as to why you have a max thickness to the panels. I would assume as long as the internal dimensions stayed the same panel thicknesses could increase, is that wrong?
We are still in between workshops but we have a pair of 18ish litre boxs for a single a10m. on the bench. They are built from a very dense wood (tiger wood)and the panel thickness is about28mm. We would like to compare this to a previous similar size pair we have built of 3/4" walnut .
With the material being 25% thicker and upwards of 50% denser i would expect a noticeable improvement. Is this wrong?
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Old 3rd January 2015, 12:47 PM   #73
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Hi Paul

Panel thickness will have been specified since it sets the physical length of the vent.

That aside, thicker / denser is not automatically a good thing (rarely in fact), but since you're working with solids & as I recall tiger wood has a good MOE value, it shouldn't need significantly more panel damping & may be an improvement.
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Old 3rd January 2015, 06:07 PM   #74
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ooooh scratch,scratch
MOE value: something interesting i haven,t heard of maybe?
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Old 3rd January 2015, 06:47 PM   #75
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Young's modulus maybe. Young's modulus - Wikipedia, the free encyclopedia

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Old 3rd January 2015, 06:48 PM   #76
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Edit -Jeff beat me to it re the link by 60 seconds. Must try harder in future.

MOE = Young's modulus of elasticity. Young's modulus - Wikipedia, the free encyclopedia

Basically the relative rigidity / stiffness / call it what you will. Take as psi. MOE goes up with the cube of thickness. So, to give one example MDF is typically hovering around 520,000 - 530,000psi; something like a quality Finish Birch Ply 1,800,000psi (based on typical 3/4in sheet material). So you need about 1 3/8in of MDF to ~equal the stiffness of the plywood since MOE rises with the cube of thickness. Doubling panel thickness (assuming the same material type) drops panel F0 0.707 x that of the original. And so on & so forth.
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Old 3rd January 2015, 09:27 PM   #77
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elastic modulus ,as it is refereed to on / wood-database.com.
thanks guy,s
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