technol

Hi guy's I have a few questions, I'm well aware of the nakhak, and diagrams for my pioneer stereo.
I havent had a cd changer it was MIA from the car, so i got sick and tired of having no cd player. I know the sc300 uses a common signal ground, and my head unit has a ground for each speaker. What i want to do is for now, use the aftermarket head unit to power the stock speakers, and then get a mono amp and sub?

How can i make this work, without having to go run new ground wires to all the speakers?
Should i just upgrade to aftermarket 4" and wait on a sub?


I purchased a JVC-KDG820
http://www.crutchfield.com/S-GIQgPLT...=257KDG820#Tab

General
Chassis Size Code IEJ
RMS Power Output 20 watts
Peak Output 50 watts
RMS Power Bandwidth 40-20kHz
Preamp Voltage 4V/2V volts
Video Control No
Preamp Outputs 3 pair
Sub Preamp Outputs Yes
AUX Input Optional
Display Color Variable
Key Button Color Red
EQ Bands 3
Sound Shaping Type i-EQ
Wireless Remote Yes
Wired Remote No
Changer Control Yes
Security Detachable face
Parts Warranty 1 Year
Labor Warranty 1 Year