100 w/c may be just enough - in any case you can already see a fair bit of distortion and compression at 95 db spl output on these charts - so you don't want to overdrive them.
More importantly you need a power amp that can deliver high current into low impedance - as the impedance drops fairly low.
More importantly you need a power amp that can deliver high current into low impedance - as the impedance drops fairly low.