Michael, just to point out the reason that it doesn't matter which QS is on which side, it's that they aren't dipoles. The QSs are a variation on the bipole(Quadpole) and have all the drivers operating in phase with each other, rather than having the drivers on opposite sides of the enclosure operating 180 degrees out of phase with each other, as dipoles do. So, it doesn't matter which side of a QS is facing forward or back.

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Enjoy the music, not the equipment.