i have mine crossed at 63hz/12db, i think 63hz is a little to low if you listen to rap or hip hop, but for rock and metal it's sick, and it doesn't put them at their limits at all. but on rap i could see your point. on the rare occasion i briefly play some rap, i bump my crossover up to 80hz/12db instead of the 63hz/12db. but if yours are crossed at 75hz i don't think they should have a problem handling the bass as long as you don't play them at crazy insane levels or have anywhere from 80hz or lower boosted in your EQ.
but overall they are awesome speakers, especially for the low price.