yeah...im pretty sure 10s could hit pretty low...but not as low as a 12 or 15 in a proper box you knowI built a cavilier with 2 crossfire xs spl 10's and a cadence zrs9000d (aka ab 500.1) and it does a 150+ at 39 hz out of the trunk. and hits just as low as my 15 does. so as for 10's not hitting low, its all in the box. And the car is driven everyday.