because your room or your hearing acuity might not be perfectly symmetrical.
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" The balance control should be useable from the listening position."
I've never had that luxury. Normally you have to jump up, run across the room, tweak, and then repeat until you say "Ahhhh!". =-} Then you have that chair set up, and don't have to do it again.
It's like Sheldon on "Big Bang Theory" finding just the right spot in a room, only you have a knob to make most all of the spots the "Sheldon spot".
Once you set up for one spot, other places in the room may not sound so good.
Have you seen the episode of "Big Bang" in which Sheldon goes to the theater and goes around the room making "MMAAWWHHAA!" sounds? He's looking for the acoustic sweet spot.