Originally Posted by
johnaec
Have you tried connecting the other L300 to the "dead" channel to be sure it's not really one channel of the amp that's out? Also check all the interconnecting cable between your components.
If you're sure it's really the speaker and not the amp or external wiring, you need to pull one of the drivers so you can inspect the wiring inside the cabinet. I'd suspect a bad connection somewhere between the input connectors and crossover in this case. I think it highly unlikely that everything went at once...
John