Auto power off after 2 hours of inactivity

I ordered another one in January 2014 and a major change ruins the product; he now cut automatically after 2 hours of inactivity and must be handed in with the wrong function manually on the subwoofer switch, normally positioned out of reach (the ground). This is a complete power down, you have to switch back the switch to Off and On to restore the road. This is mentioned nowhere, outside of a sticker (poorly translated) stuck on the subwoofer above the switch.

The previous system was cutting the sound automatically after a few minutes of inactivity but stayed on and therefore ready to operate without manipulation when the connected device (TV, PC or other) produced a sound .. Too bad. Returned system.