I'm not sure what exactly the problem is but I'll do my best to describe the problem. When it is on, the blue light is lit up on the sub and when it is off, it is orange. Lately, the sub is constantly turning off on me. It used to happen occasionally when there are loud explosions in movies, but now it is happening more frequently and sometimes even when there is no sound at all.
When it happens, I would turn the sub off and then on again or reset the T3.15AL/250V switch at the back and then it usually fires back up again and sounds fine. I've tried expensive subwoofer cables and subwoofer specific surge protectors and it hasn't fixed the problem. What could be the problem? Do I need to replace the fuse? Thanks!
Also, you may be able to raise the level of signal sent from your receiver to the subwoofer. With the higher level, the auto-sense circuit may work.
You could also replace the subwoofer cable and see if that helps.
At times mine would turn off also.
I will try to increase the signal from teh receiver to the woofer and report back on what that does.
Thank you to wwinkler that posted that tip.
I had the same problem. I noticed it turning off on loud parts of my music and then turning back on again. I got worse pretty quickly until it didn't turn blue at all. I left it off for awhile, changed outlets.. nothing. Then I turned the auto power switch to "on" instead of "auto" and the blue light came right back and steady.