Or Klipsch subs are trash. They're nice when they work.. but they seem don't work often. I have a 10" Klipsch sub as well, the same one that comes in the Quintet package [and presumably the one you have]. After a good year of normal use [I never pushed it], my auto-on now works about half the time.
When it doesn't work, the subwoofer lets a huge "FUMP" loose, and then does nothing. No sound, although the nice green light stays on for me. The only thing to do then is unplug it, turn it on, turn it off, plug in back in, turn it on. Nothing else will get it to work again. And ofc this starts happening 1.5 months after warranty is up.