1. #1
    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!

  2. #2
    It may just mean b grade steel,25 gauge 0.0209 inch
    Last edited by deisel; 03-08-2013 at 11:15 AM.

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