The ELAC HDX21 is the perfect solution for providing variable analog audio from modern televisions featuring HDMI ARC connectivity. Using the televisions standard remote control users can now control the volume to connected powered speakers or external amplifiers without the need for a complex home automation system. A separate set of analog audio inputs on the HDX21 allows for automated switching between the Televisions audio and an external audio source. You can customize the timing and threshold level for when the external audio source becomes active.