A key contributor to the NA-11S1 's technical fingerprint and sound - regardless of S/PDIF, USB or Network connection - is its integrated MMM digital filter [see boxout, p33]. Neither the default Filter 1 or Filter 2 is a conventional linear-phase FIR type and in practice the former is the more 'extreme', all but eliminating pre/post ringing in the time domain at the expense of a more obvious treble roll-off (-3.4dB/20kHz with 48kHz mfedia and -5.7dB/45kHz with 96kHz media) and poor stopband rejection Oust 3.5dB with 48kHz inputs). Filter 2 is a 'halfway house' minimum phase type with greater post-event ringing and phase distortion but a more extended HF and improved 34dB rejection of aliasing images.
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