Abbingdon Music Research DP-777 Premier Class - Manual (Page 22)

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HD1. Organic – this algorithm is unique to AMR because it was developed as part of the HD Gemini Digital
Engine. With a combination of the latest digital technologies: (i) Minimum Phase; (ii) Apodising and (iii) Soft
Roll-Off in one “Organic” algorithm, the DP-777 is uniquely able to deal with “pre” and “post” ringing in BOTH
the recording and the playback DAC. Please refer to the AMR White Paper in the DP-777 product section on the
AMR website for a detailed outline. AMR’s Organic digital algorithm produces the most life-like and analogue
reproduction of high-definition music.
HD2. MP Listen – this algorithm with the Minimum Phase and Soft Roll-Off algorithms address only “pre” and
“post-ringing” respectively in the DAC. It does not address “ringing” in the recording process. The sonic character-
istic is respectable but with some recordings, it may sound somewhat cold/dry, uninviting and lacking the final
special ingredient to make it as spellbinding as the “Organic” digital algorithm.
HD3. Apodising 808 – this algorithm is commonly referred to as “Apodising”. It also encapsulates the Minimum
Phase technology meaning it addresses “pre-ringing” in the recording and the DAC. The sound is lively but with
some recordings, it may sound artificially thin, lacking in body and heft. Note, this filter is only available to the
44.1/48kHz CD format. With such recordings, the 16-Bit Classic DAC set to Bit-Perfect I or II provides a much
more natural and ultimately, musically-satisfying performance.
HD4. Traditional – this algorithm is the most common as it is the textbook implementation. With no attention paid
to the common sources of “ringing”, this yields a more sterile and clinical sound. While this may satisfy some, it is
the least preferred. Nonetheless, we have included it so that DP-777 listeners may empathise why before the arrival
of the DP-777, high-definition music did not received the credit it deserved.
Organic algorithm
reigns supreme; it
deals with ALL
sources of “ringing”
Apodising 808 only
on the 44.1/48kHz CD
format and does not
deal with “post
ringing”
MP Listen algorithm
deals only with
“ringing” in the DAC