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RE: "adding cone woofers for use under 40Hz with my modded MMGs." ...

I'm not sure I understand, "If you delay the woofers ... you have to delay the mids & ribbons by the same amount".

DSP gets you both phase and impulse alignment typically by delaying the mains, never the subs. That's to offset the time lag from the low pass (subwoofer) filter. An 80Hz 2nd order crossover frequency has an inherent group delay of about 3.125ms equivalent to 3.5ft.

You could have a speaker setup where the subs are several feet closer to the listening position than the mains which would more than offset the LP delay, but that's a pretty unusual case.

I'm looking forward to your experiments!

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