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.
M60ti/VP180/QS8/M2ti, SVS PC-Plus 20-39, EP500
M5HP, Sierra-1, M40ti
M3v4, VP100