One of the things that I'm not so content with in the Mazda 3 is the
stock stereo. But with its stylish looking head unit and steering
wheel controls, I'd really rather not give it up. Even though I know
it is part of the downfall in the system. Since I have a pioneer 300
watt 4 channel amp, I was think of running a line converter and
changing the speakers as well, opinions? and as for the line
converter do i wire all four speaker locations or just the rear or
just the fronts? I've never used one before.