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  1. 02-08-2013 #1
    Tenson's Avatar
    Lives in London, United Kingdom.
    Tenson
    Last Activity: 29-06-2021 Has been a member for 9-10 years. Has a total post count of 555. Received thanks 29 times, giving thanks to others 9 times.
    Hi guys,

    I've been reading a 1977 BBC research paper on speaker cabinet damping and they mention using 'mild steel 25 BG' as a constraining layer. Can anyone tell me what 25BG is? I shoved it into Google but didn't get a lot. Does this indicate the thickness or just the grade?

    Thanks!
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  2. 03-08-2013 #2
    dazza's Avatar
    Lives in leicester, United Kingdom.
    dazza
    Last Activity: 12-07-2020 Has been a member for 9-10 years. Has a total post count of 362.
    It may just mean b grade steel,25 gauge 0.0209 inch
    Last edited by dazza; 03-08-2013 at 11:15 AM.
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