My retailer confirms the sleep/low power mode (push left button on front of the amp) is an option when not listening. In addition, in the Ayre manual (one of the many settings), there is a setting that, when enabled, places the amp in a low power mode after 30-minutes of no input (manual page 24).
The enable option automatically disables the audio circuitry when a selected input remains inactive after 30-minutes. As soon as the input becomes active again. the audio circuitry is automatically re-enabled. My Ayre EX-8 2.0 amp is still breaking in so I cannot judge its sounds quality. The Ayre manual says 100 to 500 hours are required for the amp to break-in. I hope this helps......

