Just blow up a cap

Too much flop - you loosened up the spider of the speaker, so it would tend to flop around more for a given excitation level. The speaker is nothing more or less than a linear motor, so the stored energy has to go somewhere - looks like it went back into the crossover caps and took them out...
 
Learning?
A polarized capacitor should not be used in a speaker crossover.
You have learned that applying alternating current (AC) to a polarized capacitor can make it explode at a voltage far under it's direct current (DC) rating.
Just 1.5v of AC may damage or explode a polarized capacitor, and 10 to 15% of it's rated DC voltage will probably blow most.

What voltage and frequency blew your 100v polarized cap?
 
One can get away with using polarized electrolytics in an AC circuit when the driving voltage is always kept below 2-3 volts ( they'll actually last quite a while ) .

It's after these low voltages are exceeded that they like to turn into hand-grenades.

Fun Stuff!!

🙂
 
OK..... The Philips was a really old one, but you´re tempting/inviting "Murphy" to visit you,
when using polarised cap´s in a crossover. That´s why you have non-polar/bi-polar 😉

Too much flop - you loosened up the spider of the speaker,

A polarized capacitor should not be used in a speaker crossover.
You have learned that applying alternating current (AC) to a polarized capacitor can make it explode at a voltage far under it's direct current (DC) rating.
Just 1.5v of AC may damage or explode a polarized capacitor, and 10 to 15% of it's rated DC voltage will probably blow most.

What voltage and frequency blew your 100v polarized cap?
Don´t know frequency, but it was low
 
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