So I’ve finally solved this. NAD C338 amp has chromecast built in and the volume from your casting device (iPhone) is integrated with the amp volume! So when I adjust the volume with the phone in the whatever app I am casting from the NAD volume control adjusts according. This is what I’ve been...
So just like when you build a car stereo system, the head unit controls the volume signal and the amps in the trunk amplify the sound according...? How can I set up a inexpensive google Chromecast system which would provide the same functionality. Basically my device and chromecast would be the...