On a 1 to 10 scale how would you rate the factory sound system - can you get a better sound system with different trim levels ?
Although I know a factory sound system on the Spark won't be good, it's always good to question what it's like. On a $12k car we can't expect much.
@OP would you be able to run us through a DIY of this? I know some people would appreciate knowing how to take apart their door panel without breaking anything.
What specific speakers did you use?
Did you wire the speakers directly to the back of the headunit or did you splice into the OEM speaker wires?