The NavNet ACA-1000 Audio Controller Amplifier features six (6) high-powered, digitally volume controlled stereo amplifiers with seven individual source inputs. The design lets the ACA-1000 be cascaded and individually addressed to be daisy-chain configured. This allows for control and room settings to be passed from a single RS-232 port of a NavNet DC-500 or DC-1000 Controller. Because of our patented Eco-System™ design, this unit consumes almost no energy when the unit is turned on and in standby. In fact it is so efficient, when a channel is not in use it is shut down drawing almost no power. This feature saves thousands of dollars in power and air conditioning costs over the lifetime of an ACA-1000.