Peter, excellent results with the 600s and BFD. Unless I've lost it in some post I've missed(been doing tax returns; finished!!),there hasn't been any discussion of how the 600s were located for the blue line readings or whether alternate locations were tested before the BFD did its thing. One of the interesting papers on the Harman site tested a bunch of alternate locations for single or multiple subs.

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Enjoy the music, not the equipment.