take a 9 volt battery, attach two wires to the terminals and touch the two wires on the corresponding wires for each speaker. you will here a slight pop in the speaker. Or go to a stereo shop near you and have them tone the speakers with a tone generator. The amp is located D/S behind the panel to the rear, if you have a changer, or nav unit, its located in that area, look down and you will see the amp and connections. I assume you have DSP correct?