Lol ok.

 

im with chaos on the rear fill, and as for what some one said about there being speakers at the back of a concert (where these pointing at the stage) as this would make no sense as the sound waves would be colliding into each other and making the sound muddy in the middle, what they do at large concerts, is they do put speakers down the sides and use a piece of equipment to delay the sound so that the sound that leaves the 1st set of speakers by the time it arrives at the 2nd set is in phase, as for the guitar amps being turned down very low this is not the case, as they are used as monitors, and the monitors on stage are generaly vocals as the band has the sound of the guitars (also bass) coming from behind them from the amps.

finaly after my rant what does a massive concert sound setup have anything to do with a tiny closed envirment car setup have to do with each other, other than they both have music and audio equipment in common