Apollo MS-RA670 Stereo with AMFMBTSiriusXM - 3 Zone with DSPThe Apollo RA670 inherits key audio innovations and revolutionary technology from the award-winning Apollo RA770 including Fusions Digital Signal Processing, enhanced PartyBus-Network capabilities, Wi-Fi audio streaming with Apple AirPlay 2, over-the-air software updates, and more source options including Optical Audio for connection to TVs in salons and cabins. From the kick drum to the eardrum, Apollo has made it inherently simple to