The M15 contains two of Questyle’s patented CMA (Current Mode Amplification) SiP modules, for a total of four CMA ampengines. This quadruple drive amplification circuitry gives anoutstandingly strong output that can drive almost anyheadphone. Questyle’s Current Mode Amplifiers arecharacterized by their small footprint, low voltage operation,and minimal power consumption. Current amplification has anaturally low impedance, affording the M15 a bandwidth up to1MHz, distortion as low as 0.0003%, and the ability toreproduce every detail hidden deep within any track.