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Speaker info you need to know

Dirty voice coils cause overheating and makes speaker response slower. When your cleaning a Black Widow coil gap take a business card and cut it small about and inch and a half, now get some double face tape, quarter or half inch wide, tape it to one end of the business card just on one side and run it around the voice coil gap. Masking tape is to wide for Black Widows. Keep doing it till it becomes clean. Keep changing the tape till its clean.
 
Dirty voice cools cause neither.

Whilevits goo practice to clean the gap of BW drivers when replacing the basket, the biggest issue with some of the older BW drivers is a deterioration of the foam vent filter which gets gummy. Masking tape will not resolve this issue, it takes a solvent approach.
 
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