98 Burb Pillar(roof) Speakers

Thinking I could get more sound in my Suburban for the kiddies in the back, I bought two speakers to put in the roof where the wires and holes already were. I hooked them up and guess what? Nothing. I guess it's not as easy as I thought. Do I need to install something else(amp, wiring, etc.)? I bought this Suburban back in '02 and there were never speakers in the back, only in both the front and second row doors. I already replaced the stock radio with a new Pioneer a few years back when the old one went on the blink. I appreciate any help.

Thanks,

Dodge

My 99 Suburban came with six speakers...2 front-doors, 2 rear-doors and 2 4x9 long ovals mounted at the back of the roof, just above where the rear doors (barn-door style) open, covered by cloth covers that match the rest of the roof cloth. If that's the kind you have/had, the main point is that all 6 speakers were not amplified by the same amplifier, some were powered by the amp built into the stock radio, some by a separate little under-seat amp.
Chances are, when you replaced the stock radio with the Pioneer, whoever wired it connected the door speakers to the built-in Pioneer amp, but never bothered to hook up the extra GM amp that powers those back-roof speakers. So even though there are holes and wires available, there's no connection to the radio and no power feeding back there. If you're good with this kind of thing yourself, you can easily trace the wires back to source and see if they are hooked up to your radio. If that kind of stuff is tough for you, either check with Crutchfield or take it into a car stereo installer and have him trace it down and hook it up for about $55-$75