Rear fill is more natural sounding to ME. People say that when you're at a concert all of the music is in front of you. That's not true. Maybe 98% of the music is in front of you but even with outdoor concerts there is some echo from behind.

Also, I used to play bass on stage so it's natural for me to hear a drummer to my left [img]smile.gif[/img]

Brother Mugen,I used the female analogy before so I wanted to use my other favourite pastime...food.

The discussion has taken a bit of a weird turn... rear fill is almost always used more as a special effect than an attempt to gain accuracy (and that is cool, unless the goal is to be accurate). Rear fill IN SOME SYSTEMS is essential for a sense of spatial accuracy in others it is not. At a live event the time delay of the rear and side echoes will give a sense of hall size. For accurate reproduction in a car, rear fill can mimic that affect and the perception of depth can be enhanced (I suspect this is distortion in most cases but... do what makes you happy).

I only have a 3 way comp set up front but my sub is crossed over a little high at the moment and adds the rear fill spatial affect.