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Old 21st February 2003, 07:24 PM   #1
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Question Plexi

I have constructed a dual bandpass subwoffer box out of 3/4 MDF, it has a window, does anyone know how thick the plexi for the window should be
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Old 21st February 2003, 07:31 PM   #2
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6mm atleast. i'd go with 10-12mm just in case.
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Old 21st February 2003, 07:33 PM   #3
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alright thanks, does doubling the plexi together work or will it give a rattling sound?
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Old 21st February 2003, 07:40 PM   #4
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it will rattle but you might be able to damp that.

use silicone cement or a thin rubber sheet between layers and cement layers as tight as possible.

use as thick as single sheet as you can find 6mm might work better than 2x6mm as it wont rattle as much.
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Old 21st February 2003, 08:25 PM   #5
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not sure if this helps or not, but if you're concerned with reducing sound transmission through the window, and you're using a double pane of plexi or glass or whatever, it helps if the two panes are different thicknesses. this reduces sympathetic vibrations. (that's where the inner pane vibrates, causing the air to vibrate, causing the outer pane to vibrate.)

different thicknesses of material creates an asymmetry of periodicity, so the vibrations are dampened. (damped? whatever...)

/andrew - is neither damp nor dampened
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Old 24th February 2003, 04:38 AM   #6
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good idea
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Old 24th February 2003, 04:45 PM   #7
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In radio station, they have two windows not parallel to reduce vibration.
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Old 24th February 2003, 05:22 PM   #8
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i suppose if you could find a way to evacuate all the air out of the space, that might help some too.

/andrew
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