Monday, April 18, 2011



The DP-777 sports two separate DACs inside, so you can choose to listen to 32-bit high-resolution or classic Philips 16-bit DAC one (selectable via remote control). AMR claims the world's most advanced patent-pending Global Master Timing clock lock technology which intelligently chooses over 28 million different real-time clocks to exactly match the dynamic input clock , the DP-777 decouples the DAC system clock completely from SPDIF/USB inputs to eliminate jitter. The USB input is 192kHz capable and asynchronous.

Several user selectable digital filters (via a DSP chip) including Apodising, Minimum Phase, Linear Phase, Soft-Knee and Brickwall Filters under: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz; 192KHz.

The input stage has 2 x 'HD' Valve Driven Technology (world's first) XLR/BNC SPDIF inputs (24/192kHz) plus 2 x 'HD' RCA/Optical SPDIF inputs (24/192kHz). The output stage is ofcourse tube and its defeatable resister step volume control is in analog domain.  There are also two analog input so it can function as a preamp!

Detail from its press release:

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 one Classic 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 managing all the signal processing, we have in effect, created own DAC chipsets that perform and function at the leading-edge.

Zero Jitter Mode The Zero Jitter Mode utilises our completely innovative Global Master Timing (GMT) and Intelligent Memory System (IMS) to totally eliminate jitter originating from the source. AMR’s Global Master Timing clock system intelligently actualises over 28 million different real-time clock frequencies to exactly match the dynamic input clock e.g. 192,000.001Hz or 192,000.002Hz of the source. Coupled to the Intelligent Memory System (IMS), the GMT/IMS system block out source jitter once and for all.

192kHz Asynchronous USB Input The DP-777’s true 192kHz Asynchronous USB Audio Class 2.0 Input effects a genuine asynchronous decoupling of the DAC system clock from the computer.

HD Valve Digital Input (HD-VDI) This is AMR’s unusual brainchild of using an New Old Stock (NOS) valve designed to operate into several 100Mhz to amplify and purify the high-definition SPDIF signal with zero feedback. Clearly visible on an oscilloscope, with HD-VDI, the signal changes from a blurred to clean and sharp square wave. As result, any deficiency in the incoming SPDIF is hereby totally 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 loop feedback. No solid-state devices are present in the signal path.

High-End, Direct-Coupled Pre-Amplifier The DP-777 is also a direct-coupled/buffered analogue pre-amplifier capable of accepting two analogue sources in addition to the signal internal to the DP-777. The DP-777 has an exceptionally precise 71-step resistor matrix-based Analogue Volume Control (AVC) system that delivers unmatched transparency. To attain the highest sound quality, no digital volume control is used whatsoever. 

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