I just put in my JBL GTO920 and they sound NICE! They are a perfect fit and magnet JUST clears the trunk springs. The bass goes lower and tighter, with a bit more headroom.

But when removing the stock units, I had to notch the rear panel to fit my socket and get access to the rear screws.

FYI for wiring...
~ red/yellow & blue yellow wires = +
~ brown/white & gray/white = -

 

GOT PSI.....did you also change your front speakers? If so, what did you use? Did you also do JBLs?? 5 1/4s or 6 1/2s?? I'm looking at changing all of my speakers and my head unit......I like the fact tha tyou said the JBLs you got were a "perfect fit".

thanks for any info you can give

 

Ummm ... I have GTO930 for the rear but they dont sound that nice. The high is good but low is muddy and distorded.

 

Nole: I didn't change the front speakers as I'm selling my CL-S.