Why do they call it a bug screen?

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So I was pulling out a pair of the monster alnico JBL 2482's for a friend... these babies have a big 4" coil and can handle sixty watts at 300Hz... considering they are over 110dB/watt on a horn, that is, what? 130dB or so? crazy stuff.. so when I found this inside:


all I could picture were the bugs at a Black Sabbath show... headbanging away.. and trying to get closer to the speakers to make it louder and louder...



Peace,
Me