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:    • Refoaming JBL Control 1 Speakers  

Sources:
Yamaha NS-10 photo: http://forum.cakewalk.com/FindPost/33...
Yamaha NS-10s in studio photo: https://commons.wikimedia.org/wiki/Fi...
JBL Pro III photo: https://en.audiofanzine.com/active-mo...
JBL L150 photo: https://i.pinimg.com/originals/fe/42/...
Voice coil photo: https://en.wikipedia.org/wiki/Voice_c...
Magnepan input terminal fuse photo: http://hifiup.com/shops/6058
JBL Control 5 photo: https://en.audiofanzine.com/passive-m...

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Music by Epidemic Sound (https://www.epidemicsound.com).
Intro music by BoxCat Games (https://freemusicarchive.org/music/Bo....