Scarecrow sent me the link so I found the manual online.
It's 2 channel 40 watts per speaker, so if you only hook up one set of speakers you get 80 watts. it also has line leveloutput which means amp hookup (which I recommend) is a breeze.
Here's the deal with amps. The more you increase the volume on your stereo (past about the halfway point) the more distorted the sound becomes. VW's are very noisy environments which means you'll need to turn it up to hear it. An amplifier (nothing ridiculous) will give you much better sound at the mid-point on your volume dial.
My 2CENTS on speakers.
Run front speakers. You hear more when the sound is comiing from all directions.
Don't mount them in the door panels! Door panel is the worst place to mount a speaker. It's not a dry environment, and closing the door constantly subjects the speaker (and the door panel) to tremendous stresses which ruins them very quickly.
Don't mount them in those stupid kick panel boxes. It's already too cramped down there.
Use GOOD 4" or 4x6" mounted up under the dash at the front firewall in custom made enclosures OR buy the enclosed speakers.

Keeps you from kicking them and getting them all wet
BTW if your car has a body lift on it I1t you can mount 6x9's up there with plenty of room!