I have a home setup with 11 Bose Sa5 devices (one for every room) the setup is working flawless ( Ethernet connected). However I can't find the actual power usage of a Bose SA5 amplifier. Even in the Bose manual they list 400w but that is Maximum output I guess, what is the power consumtion when in standby? And can the units be placed in standby? As I have 11 units i measure a power consumption of roughly 1200watt per hour! which is a lot for units that are turned off. Please advise in this matter.