Lightning Wakeboard tower speakers question

I have a pair of Lightning Wakeboard tower speakers (dual 6.5") on my tower. The JL audio amp that powered them died so I bought an Arc Audio KAR 600.2 to power the tower. The guy at the stereo shop said that the amp will overpower the (in his words) "weak tower speakers" Should I replace the tower speakers or just deal with it? The tower on my Calabria is low and I'm 6'-3" so I cant go huge with a new tower speaker.....