I bought mine before self-powered subs had a signal sensing circuit. The switch to turn it on/off is in the back where you can't find it, so I have just left it on all these years.
Not really making any point, just that I was looking at its green LED and trying to figure out when I bought it, and realized that it had been on a really long time. Also, that I'm really lazy and won't search for the off switch.
A lie can travel halfway around the world before the truth gets its shoes on.-- Mark Twain