Acoustic Research M20 DAP Professional Music PlayerLast year, Acoustic Research released the industry favorite DAP, M2; this year, they responded with another breakthrough the even more advanced M20. M20 is equipped with higher level Burr Brown chips, supports DXD (384kHz) and DSD64 128 Hi Res sources, and comes with 13 hour continuous playback time thanks to the 3150mAh battery, with support up to 200GB microSD card. M20 also has the latest Panasonic capacitance and a ten layered PCB design,