You can tell if it has the nakamichi system by looking at your radio. If it does not say Nakamichi on the left hand corner its to Pioneer system. The crossover is inside the speaker enclosure
I know i have nak, but what i was asking is sc400 with nak installed, does these come with nak amp? i thought i read somewhere sc doesn't come with amp, only built in head unit amp...
if there is an amp, where is it located?