The HD-AMP1 features the unique Marantz Musical Digital Filtering (MMDF), inspired by audiophile reference class technology. For Marantz, using standard digital filter solutions is not an option, as this filtering is crucial to the sound reproduction of digital input signals. As a result, the company invested extensively in gaining expert knowledge, leading into highly-acclaimed Marantz Music Mastering technology used in award-winning Premium Range 11 Series products. Adapted for the HD-AMP1 hardware design, the new solution is called Marantz Musical Digital Filtering. Two selectable, digital filter characteristics cater for different tastes, and each handles even the minutest of detail with loving care in the digital audio signal, transforming new media files into the finest of high-resolution playback.