Sterio/ speaker question

[GMCjunkie]

Hey yall! Ok, this is something else Ive never really messed with. Before I put my Burb in the paintshop, I removed all sterio, amp and speakers, half of which were rotted and non functional. I really want to put my sterio back in (even tho its cassette, lol) I have a set of 6x9 I just want to put under the middle seat. Im not into thumping and bumping, I just want to be able to hear it, Do I have to install the AMP? or should I be able to get enough volume from the 6x9? Also, if anyone can explain it VERY simply and VERY clearly, how do I hook up the sterio and speakers? I know the sterio basically just plugs in where it was before, but Im using different speakers.

thanks!!
junk

[motornut]

you may want the amp to get over the road noise
depends on the radio might not have much volume
it's important to find the neg/pos with the speakers
otherwise they get outa phase and would sound low/no volume/bass
if it's not marked you can use a nine volt battery to check for speaker +
note the pos on the battery and tap/touch the wires to the speaker when the speaker pushes out, note wher the the pos side is