My SSS has two amps on the parcel shelf, each with 2x40WRMS written on them (they're Clarion OEM things). I'm pretty sure the 'standard' sound package was amped front speakers and unamped rear speakers.
They're nothing special - one of my next tasks is to run new wiring directly to my speakers, and get rid of the amps (one of which is about to die - flicks on and off intermittently).