Hey guys, I read myself through some forums in the past six months to gather infos for a perfect sound setup. And as many of you make the one big mistake that every serious car-hifi enthusiast laughs about, I think I'll share my findings with you. 1. Never have Speakers at any other place apart the front! The argument for this is rather simple: Music is mixed for Stereo, so that you can (with a good setup) hear where every musician and every Instrument would have been on a stage. But if you have speakers behind you, you destroy this virtual stage. The only exception to this is the Sub, as a human ear can't hear where the sound of really low frequencys comes from. Especially on the parcel shelf are the ones everyone that spends time on searching infos for a good Audio Setup will laugh about, as they are the worst, playing free-air into the trunk. 2. Use 2-channel Speakers! To achieve a clear stage, you have to mount at least 4 Speaker-chassis in the front. 2 Small ones for the low to middle frequencys in the door, 2 high-frequency specialized tweeters anywhere where they are in front of you and directed exactly at the ears of the driver without anything (like a steering wheel) blocking their line of sound. I suggest 16cm in the doors with fitting tweeters in the A-Pillar or on the Dash. 3. The stock places for the front speakers are CRAP! That's something everyone of you will agree, speakers that play to the knee are a real failure. Seriously, didn't the Toyota engineers think about that at all? Also, only 10cm thingies are not very good for a good sound. 13cm Speakers can be fitted with a few mods, but these are not good either because of the position. These are just a few simple tips for a better sound in the car. I have some more, more detailed ones and so on. I'm by no means a real guru on this topic, but I am a person to read deep into the theory if something is interesting me. If you like this and want more tips, feel free to tell me so, I will help in any way I can.