You know, I've heard of this Cardas formula before, and the thing I can't figure out is this: How can Cardas claim that the correct placement of a speaker is robust to the speaker's design? Are we to believe that a pair of (aft ported) Audio Physics Spark IIII's, a pair of (front ported) Tyler Acoustics Taylo Reference Monitors, a pair of (sealed box) Linn Ninkas, and a pair of Klipschorns, will *all* sound their best at exactly the same position in the room?