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Max SPL 6-panel vs 4-panel Quads

Why is it that the 6-panel Quad 2912 don't play any louder than the 4-panel 2812 (or the ESL-63)?

I thought that the max SPL was defined by xmax (max diaphragm displacement) and Sd (diaphragm area), and a larger Sd could lower diaphragm displacement, hence make the speaker to play louder. Obviously this is not the case, as Quad states the same maximum output for the two systems.

Any comments?

Per.


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