2x40W ultra power efficient, fully Integrated audio amplifier IC with analog input This product is not for a new design. Check out our new MERUS™ multilevel gen2 class D amplifiers MA2304DNS and MA2304PNS .MA12040 is a highly efficient, fully integrated, digital audio power amplifier IC, based on multi-level switching technology. It supports a 4-18V supply voltage range, allowing it to be used in many different audio applications.