Why is there a need for 3 woofers ?
Do they all play the same frequencies or are the bottom 2 more like subs ?
Also why ars the bottom 2 woofers opposing , is there any purpose to that?
Cardiod control uses additional woofers side and/or rear for cancellation of the front wave radiation (to the side/rear at the lowest frequencies). I expect the available modes are somewhat complex as they have their own crossover frequency range.
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