Abbingdon Music Research DP-777 Premier Class - Manual (Page 23)

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4.4 Classic 16-Bit DAC Algorithms
The DP-777 under the Classic 16-Bit DAC offers 2 user-selectable methods of filtering that can be cycled through
during playback by pressing the “Filter” button (RD9) on the RC-707.
The Filtering options are:
CD1. Bit-Perfect I – this mode directly takes the data extracted from the inputs and re-clocked to generate the
music signal. Due to the complete lack of digital or analogue filtering, the treble frequencies are slightly rolled off,
making the sound somewhat soft and laid-back. For the same reason, the mid-range and below is very natural and
realistic. The reproduction of impulses is completely undistorted. This mode often helps to tame overly-bright
recordings.
CD2. Bit-Perfect II – this mode is identical to Bit-Perfect I but complements this with a special analogue filter
which corrects the slight roll-off in the treble frequencies. As a result, the tonality is more accurate in the treble. We
therefore recommend this mode as the benchmark with which to enjoy music.
Note1: under Bit-Perfect I and Bit-Perfect II modes, the DP-777 is the only processor in the world that can preserve the integrity of the data all the way
from the input right through to the output. Hence, it is truly “Bit-Perfect”. These modes were developed by and are exclusive to AMR.
Note2: For an Input Sampling Frequency of 88.2kHz or above, under the Classic DAC, only Bit-Perfect I is available. This is because the special
analogue filter under Bit-Perfect II is not required for these higher sampling frequencies. However, for the best sound from sampling frequencies of
88.2kHz or higher, we recommend the use of the HD DAC or just press the “AMR” button for the optimal playback configuration.
Bit-Perfect II is the
benchmark for classic,
16-Bit recordings