Thanks for the update. According to Tom Cumberland, Axiom's electrical engineer who designed the amplifier for the EP500/600, the EP500 consumes "about as much as a night light," which is likely around 10 watts or maybe a bit less. He has never been more specific, and I've never measured the current draw in the 500's ON but not active mode.
Using the EP500's hard OFF switch does totally turn off the sub's amplifier. I tend to turn my EP500 off at night because, as a kid, I was constantly harrassed by my parents to "turn out the lights!" and I find it unsettling not to obey, even though my parents passed away years ago.
It makes no sense, of course, because everything else I use that has a remote-control circuit is always on stand-by, waiting to be kicked into life by one of my many remotes. . .I think there is some startling statistic from the U.K. that measured the increased power consumption of all those wall warts and standby circuits of electronics. I think the E.U. has issued some recent edict about this.
I also don't advocate using a power bar to completely turn off all components.
Axiom Resident Expert