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.
HT: M60ti/VP180/QS8, SVS PC+ 20-39, EP500
Music: M5HP, Sierra-1, M40ti
Idle: M2ti, M3v4, VP100