Revamping Keele W-Bins

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I have 4 Keele design single 18" W-bins (1200*600*800). One pair has JBL K151s, The others Cetec Gauss 8842 drivers. When I originally got these, I powered them with 300 watt amps, and that was fine. Now I have 3000 watt amps (QSC PLX 3402s) and I have to tread carefully on the gas pedal as the old drivers are not built for these sorts of powers. Any suggestions as to what modern drivers would offer a significant improvement without trading off sensitivity for power handling. Particularly interested in Neodymium to preserve the aging back.
Cheers
M
 
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