Question for you gurus. Someone put an Infinity head unit (looks like the original radio would have but says "Infinity" on it) in my 89 Fifth. The sound is horribly weak. The speakers appear to be original with no amps on any of them. What is the easiest way to get good sound? Find a non-Infinity head unit, or find speakers that go with the Infinity system. Trying to keep original appearance. I have the dash and back package shelf out now so it will be easy to change any of it out before I put the headliner and trim back in. (Now that's another story!) Thanks. And...go!