Fusion Apollo MS-SRX400 Stereo w/AM/FM/BT - Single Zone w/DSP [010-01983-00]Apollo MS SRX400 Stereo w AM FM BT Single Zone w DSP If you want to build a cutting edge multi zone audio system on your boat, Fusion's Apollo Series has everything you need. Start with a Fusion MS RA770 or MS RA670 touchscreen marine receiver, then add one or more of these MS SRX400 zone receivers in other zones on your boat. You can sync up all the music on the boat with Fusion's PartyBus feature, or use each MS SRX400 as an individual entertainment