99' Boxster factory radio configuration question

[michael_J_brown]

The previous owner pulled the head unit out of my car and installed some JVC POS, a power amp in the front trunk, aftermarket door speakers and an aftermarket alarm system with remote kill switch.

I have removed all of this junk and will put the car back to it's original factory configuration. The speakers are easy enough to find and replace and so is the head unit. What I don't know is if the system had an amp and if so, where is it?

Anyone have any experience with the factory sound system or can point me in the right direction?