Driver Side Speakers Out
 

Hey, this is my first time posting. I have a 99 s70 and for the past 5 months I have been driving around with only my passenger side speakers working. I have finally gotten too fed up with it and would like to figure out a way to fix the problem. I would understand if maybe 1 or 2 of my speakers blew out but it is ALL of my speakers on my driver side. This leads me to believe it has to be something with the wiring. I pulled out my radio today to see if I could see a loose wire.... but with no luck. I want to know if there is anyone who could give me any advice seeing as I don't want to replace the radio in a car that has 142K miles on it.
Thanks