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The DC-901 showcases Accuphase′s mastery of sophisticated digital
technology and creative circuit topology. It is a digital processor
designed to bring out everything the SA-CD format has to offer. A new
technique called MDSD allows straight D/A conversion of the DSD signal.
Multiple DSD signals delayed through digital processing in an
ultra-high-speed FPGA are converted by separate D/A converters. After
D/A conversion, summation of the multiple data is performed, resulting
in an ingenious moving-average filter circuit with double-speed
accuracy. An important characteristic of MDSD is the use of MDS type
D/A converters which keeps conversion errors to an absolute minimum. At
the same time, the MDSD circuit acts as a high-cut filter with
completely linear phase characteristics. The end result is a digital
signal of outstanding quality, allowing the music to emerge in perfect
clarity, demonstrating the ultimate potential of the SA-CD format.
Ultra-high-speed FPGA harnesses digital processing power to
implement innovative MDSD reproduction with double-speed high-precision
moving-average filter circuit.
Sixteen MDS type D/A converters driven in parallel. Each channel uses two Hyperstream™ DAC chips (ES9018) in parallel.
“Direct Balanced Filter” performs totally separate analog low-pass filtering for line and balanced signal paths.
D/A converter printed circuit boards made from glass fluorocarbon resin with low dielectric constant and low loss.
EXTERNAL DSP input/output connectors (HS-LINK and optical) allow insertion of DG-58 in signal path.
Seven digital inputs: HS-LINK, balanced, coaxial (2), optical (2), USB.
Coaxial and optical digital outputs.
Line and balanced analog outputs. Phase selector switch for balanced output.
Completely separate construction of digital and analog
sections, each powered by a dedicated high-efficiency toroidal
Music is an oasis that refreshes us in our journey of life.
Music can be soothing, exciting, exhilarating. It can move our hearts and enrich our lives, which is the goal we at Accuphase seek through audio technology.
This was the idea behind the slogan "Enrich Life through Technology" which originally brought together the group of very highly skilled audio experts who conceived and today produce the successful Accuphase line of audio equipment. It is the guiding principle behind all Accuphase components whose high grade can be considered extravagant. Just as there are exquisite musical instruments that are especially highly prized, we believe that the same applies to audio components. This belief forms the basis of our design concept. It is the reason why we strive to build extra value into each of our units so that they will display fully the merits of hand construction.
The name ACCUPHASE was adapted by taking the prefix ACCU from the word "accurate", and combining it with PHASE which is a most important factor in audio technology. We feel it is a very fitting brand name to describe our products that fully portray this and other important characteristics, which penetrate the innermost depth of audio technology. Our endless pursuit of quality requires a very high degree of processing which persuades us to avoid the use of mass production systems. Consequently, production volume is limited and Accuphase products are available only at a restricted number of specialized stores.
Accuphase equipment is not subject to the whims of market fashion since they are made, above all, to achieve true high fidelity sound reproduction. This is the foremost reason why our products have enjoyed long-run production.
PDF 1 Convertor Digital/Analog (DAC) Accuphase DC-901
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