hi,
my '03 c70 has 11 speakers with dolby prologic and center speaker. But...
It has no back seat speakers [i know it was an option]
sooo I want to add these 2 woofers.
on the diagram we can see that the door speakers [number 10] looks the same as back seat speakers [number 20] , plugs look the same 
I have 2 woofers [from doors], i will buy a button to turn on/off speakers. the wiring is on its place.
and now questions:
1. Did anyone add OEM back seat speakers to C70?
2. If i will add 2 woofers and button to turn on/off speakers- will it work?
3. Or do I need crossovers [number 23]. If so- what for?
