Did they just stop working, or are they making scratchy noises ?

If both went out together my first thought would be a connector or something on the crossover PCB, and putting the M80 woofer in wiggled <whatever> back into position again.
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M60ti/VP180/QS8, SVS PC-Plus 20-39, EP500
M5HP, Sierra-1, M40ti
M2ti, M3v4, VP100