I've checked under Electronics but can't seem to find the answer, does my GS300 w/stock Pioneer have only 2 tweeters, the ones up front ? I've noticed when I sat in the back seat to test the audio, it was fairly bass heavy, since the subwoofer is right behind you, but are there rear tweeters in the doors also ?

 

LP - Nope! Both sets of doors contain a wimpy 4" driver - trying to be a full range speaker but fails miserably!! The tweets R in the front door A-pillars only in the Pioneer system. BTW - the answer to speaker sizes/locations is in the Lexus Q&A link.