I was trying to see if such a product exists. I would like to find an audio system that can utilize multiple head units for different locations to control the level, bass/treble, source, tracks etc... and maybe even have small lcd screens that can display the info like an ipod so you can see the info better than the regular DIN size on headunits. These 2 or more head units share control of the entire outside system and access music from a central server or data storage unit. Is there anything out on the market for this. I would like this for a Viking sportfish where I could access this from the cockpit or the bridge and the different rooms could all access the media for playback in the seperate staterooms. I just didnt know if such a product exists where multiple stations could access the central server or storage unit at the same time?