Super Audio CD uses a new and radically different technology called Direct Stream Digital (DSD) to convert music into a digital signal that can be stored on a disc. Compared to the traditional PCM (Pulsed Code Modulation) method (the technology used for CD), DSD offers a much higher resolution by following more closely the original wave form of music. With a frequency response of over 100kHz and a dynamic range over 120dB across the audible frequency range – some 64 times higher resolution then CD - Super Audio CD offers music reproduction that reveals details you just can’t hear on a normal CD. The Direct Stream Digital™ pulse train "looks" remarkably like the analog waveform it represents. More pulses point up as the wave goes positive and down as the wave goes negative.