sound system

Just wondering if anyone knows what the amp is in a 2001 sentra. It is a 2.0 SE with a 7 speaker system. It's the amp for the sub I'm trying to find.
thanks

the amp is built into the headunit, if I had to guess I'd say it puts out around 10x4 rms

there is also an amp for that rear "sub" hanging in the basket below it, it puts out 80x1 "peak" @ 1ohm, probably around 20rms.