Fixing My Vintage Speakers -- But Why Are There Light Bulbs Inside?

My JBL Control 1 Plus speakers are about 30 years old and have an intermittent fault. In the process of fixing them, though, I found incandescent light bulbs attached to their crossovers...and the reason why is very clever.

Jan Beta's Control 1 foam surround replacement video:

Yamaha NS-10 photo:
Yamaha NS-10s in studio photo:
JBL Pro III photo:
JBL L150 photo:
Voice coil photo:,_three_inch_diameter.jpg
Magnepan input terminal fuse photo:
JBL Control 5 photo:


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Music by Epidemic Sound (
Intro music by BoxCat Games (
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