The ZEN-M processor seamlessly converts late model Mercedes factory MOST-150 audio bus to 6-channel analogue RCA and TOSLink output. Adding aftermarket amplifiers to the OE NTG5, 5.1, 5.2 or 5.5 system has never been so simple and seamless.  This kit integrates with the OEM M.O.S.T.® bus to retain volume control, full fade and balance (analogue only), treble, mid-range, bass control & Bluetooth voice calls with no external speaker (true OEM integration).