I'll concure on the head unit power ratings... think about how small the amp actually is on these things, think about how much smaller the power supply must be.

NO head unit is going to have much in terms of power. Furthermore, most purposely don't even have freq responses that go below ~40-80hz just because there isn't enough power in the first place.

If you don't care that much it will be fine, if you do care you have to go with external amps.

-Ben
HT v2.0
HT v1.0