Abbingdon Music Research DP-777 SE DAC/PreAmp

Brand New Still in Shipping Box AMR DP-777 SE Dac/PreAmp in Silver.  Box has never been opened.  Unit was purchased in January 2016 and never got around to building second system.  Description from AMR Web Site:

High-Definition (HD) digital audio is redefining
the quality of recorded audio for the 21st Century. Having created some of the
most natural and captivating music sources on the CD standard, AMR has turned
its attention to High-Definition audio and in its own imitable way, taken the
road less travelled.

Our first objective was to deliver the maximum quality of
music from the existent libraries of CD standard audio (be it on silver disks
or as ripped lossless files) equally balanced with the requirement to also
deliver the maximum music quality from the new HD audio formats. We
meticulously auditioned the full array of HD DAC chipsets and
whittled the field down to one of the latest and most outstanding. 

Again, the standard textbook implementation was shunned as
we applied the same assiduous design and execution of the multi-award winning
CD-77 to unleash the full, latent potential of the HD format. Each
stage of the signal path is a technical magnum opus focused upon one objective:
the most enchanting and pulsating performance. The result is the DP-777 Digital
Processor

.The DP-777 has the same, unparalleled DNA as every other
AMR component; with extraordinary digital advancements never seen before in any
converter

·      
Gemini Digital Engine
(GDE)* Unlike any other converter, at the core of the Gemini Digital
Engine, there is not one, but 2 distinct chipsets that define their generation;
one latest generation High-Definition 32-Bit DAC to produce the best
sound from HD recordings and oneClassic Multibit 16-Bit DAC to
produce the best sound from CD. These two "non-identical twins"
deliver the best of both worlds in a way that is simply unmatched. Further, the
Gemini Digital Engine pushes these chipsets beyond what is thought possible.
Using Field Programmable Gate Array (FPGA) and Digital Signal Processing (DSP)
to handle the core digital duties, including the memory buffer and the signal
processing, the outcome are two specially-commissioned DAC chipsets that
perform well beyond the textbook.

·      
Zero Jitter Mode* The Zero Jitter
Mode utilises AMR's ingenious Global Master Timing
(GMT)* and Intelligent Memory System (IMS) to totally eliminate
jitter coming from the source. The Global Master Timing clock system
intelligently actualises over 28 million different real-time clock frequencies
to exactly match the dynamic input clock down to 0.001Hz (i.e. ~0.04ppm
accuracy) of the source. With this new vanishing-low jitter clock coupled to
the Intelligent Memory System (IMS), the GMT/IMS system locks out source
jitter.

·      
24/192kHz Asynchronous USB
Input The DP-777's 24/192kHz Asynchronous USB Audio Class 2.0 Input is a
true asynchronous decoupling of the DAC system clock from the computer that is
also fully future-proofed.

·      
HD Valve Digital input
(HD-VDi)* This is AMR's atypical brainchild of using a New Old Stock (NOS)
6N11 high-speed valve designed to operate into several 100Mhz to amplify and
purify the high-definition SPDIF signal with zero feedback. Clearly visible on
an oscilloscope, withHD-VDi, the signal changes from a blurred to clean and
sharp SPDIF signal. Any deficiency in the incoming SPDIF is completely removed.

·      
OptiValve Output Stage Two NOS
valves perform the left and right channel analogue amplification and output
buffering duties using the same demanding approach as the CD-77/CD-777; where
one half amplifies and the other half buffers without any negative feedback
loop. No solid-state devices are present in the signal path.

·      
High-End Pre-Amplifier The
DP-777's direct-coupled/buffered analogue pre-amplifier stage is capable of
accepting two analogue sources in addition to the signal internal to the
DP-777. The exceptionally precise 71-step resistor matrix-based Analogue Volume
Control system delivers unmatched transparency. To attain the highest sound
quality, no digital volume control is anywhere to be found.

Operation Modes:

• High Definition 32-Bit DAC


• Organic: 44.1/48/88.2/96/176.4/192 KHZ


• Apodising: 808:44.1/48 KHZ


• MP Listening: 44.1/48/88.2/96/176.4/192 KHZ


• Traditional: 44.1/48/88.2/96/176.4/192 KHZ

• Bit.Perfect I; no digital or analog filter


• Bit.Perfect II; no digital filter sinc(X) analog filter

Digital Audio Inputs:

• 2X XLR/BNC with HD Valve Digital Input Technology


• 2X RCA/Toslink SPDIF Interface


• 1X 24/192 Asynchronous USB Input

Analog Input

• 2X RCA Per Channel


• 1X RCA/XLR Per Channel

Frequency Response

• 20HZ to 20KHZ +0.0, -0.5 DB

Signal to Noise Ration "A" Weighted

• >100 DB

Power Consumption

• Standby <1 W


• Power On <60 W

Dimensions

• 17.7 Inches Wide


• 4.7 Inches High


• 14.6 Inches Deep


• 25.4 Pounds