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Between the L7 on and off, the 6db difference at ~130hz, 5db at 550hz and the 4db at 1.5k are substantial. All I'm saying is this is a direct result in the phase coherency and time arrivals of the sources. Not only can you see it on the graph, it is very apparent to the ear. At each one of those points it's essentially double the output with it off. Waveforms do not need to only be 180* out of phase to affected. The slightest shift in phase affects summation and cancellation between two waveforms.
I'm about to go back out to the garage for more tinkering.
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