The local skating rink I go to has four JBL 4520 cabinets used as subs.

One caused a woofer to self destruct by someone pushing frequencies under 30Hz through the cabinet at high levels and the horn unloaded causing the speaker to go into over excursion thusfore destroying itself.

I removed the blown driver and it is a Peavey Black Widow.

Pretty sure that is not a proper speaker for that cabinet.

What currently available driver would be a good choice for those cabinets?

The drivers are wired in parallel for a 4 ohm load, but I'm thinking a 16 ohm driver would be better as I would have an 8 ohm impedance per cabinet which will put less load on the amplifier.