Audio Systems: Infiniti J30 Rear speakers, 1996 infiniti j30, infiniti j30

Question
Hi,

I am a complete novice at car audio, please assist.
I have a 1996 Infiniti J30 with a BOSE system and the rear speakers start to tremble and the sound breaks when I increase the bass.

I guess, I need to replace the REAR speakers.

1) Are there directions on how to remove the REAR speaker?
2) Would it be better to repair or replace? How?
3) If I replace with SONY speakers - would I need an amp?
4) When I buy online, shoud I look for speakers or subwoofers? I don't know what the rear speakers are called!
4) Any other comments!

Thanks,
-Swapnil

Answer
there is only 4 screws holding the speaker from inside the trunk
the bad news
you can only replace it with original speaker from the dealer
BOSE nothing else will work there  NO sony  ONLY BOSE  

YOU HAVE A BOSE AMPLIFIER SO NO NEED FOR any more amplifiers
good luck