Accuphase DP 400 Brochure
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Dedicated CD Player with high-precision drive - High-quality disc tray made from extruded aluminum, combined with ultra quiet and smooth loading mechanism. Processor section features further re ned MDS++ type D/A converters. Fully separate transport and processor section, with coaxial and optical transport outputs and digital inputs, allowing easy insertion of DG-48 into signal path for sound eld correction in the digital domain. The Compact Disc format with its 20-year history offers an unsurpassed wealth of musical treasures. It still is the most important source medium for many music lovers. Many audiophiles have extensive CD collections and they want to get the best and most up-to-date reproduction quality possible. In response to such demands, Accuphase developed a CD drive in-house and fi rst incorporated it in the high-end dedicated CD player DP-500, which has won enthusiastic praise the world over. The DP-400 inherits the technical know-how of the DP-500 while employing the latest digital technology. It offers CD reproduction bound to satisfy even the most discerning audiophile for whom sound quality is paramount. By bringing out the full potential of the format down to the fi nest nuances, it lets the listener rediscover the sheer exhilaration of the music experience. The high-precision drive mechanism in the transport section of the DP-400 uses a chassis construction that not only keeps internal vibrations of rotating parts to a minimum, it also is highly impervious to external vibrations. This is the secret behind extracting the information on the CD one-hundred percent. The sophisticated know- how gained while developing the DP-500 is fully in evidence here. The processor section incorporates digital technology of the highest order, with a further refi ned MDS++ type D/A converter, another proprietary Accuphase development. In the DP-400, two strictly selected high-performance delta-sigma devices are operating in parallel. This signifi cantly improves performance parameters including conversion accuracy, THD, S/N ratio, and linearity at low signal levels. The analog fi lter is a Direct Balanced Filter with totally separate analog low- pass fi ltering (3-pole Butterworth) for the balanced and unbalanced signal paths. The transport and processor sections are confi gured independently of each other, allowing separate use in conjunction with other components. MDS++ D/A converter Block diagram of DP-400 n Block diagram of MDS++ converter in DP-400 THD ( + noise) vs. frequency response Linearity (digital input vs. analog output) Optical input indication Coaxial input indication n MDS type D/A converter principle Note the ratio between signal and conversion error. In the MDS output, the error is very small in relation to the signal. Digital Input Signal Conversion Error (Normal Phase Output) (Normal Phase Output) (Reverse Phase Output) (Reverse Phase Output) I (Current)/V (Voltage) ConverterVoltage Summing DAC Output Subtraction MDS Output (Signal) (Conversion Error) MDS (Multiple Delta Sigma) is a revolutionary design which employs several delta sigma type converters in a parallel confi guration. In the combined output, conversion errors cancel each other out, resulting in a drastic improvement in all relevant aspects of converter performance such as conversion accuracy, S/N ratio, dynamic range, linearity, and THD. In the DP-400, two delta- sigma type PCM1796 converters (made by Texas Instruments) are driven in parallel. Compared to a single converter, this results in an overall performance improvement by a factor of 1.41 (= ). As shown in the diagram, the MDS++ features an enhanced current-to-voltage (I/V) converter for processing the D/A converter output current. A combination of current summing and voltage summing is used, providing even better stability and top-notch performance. The music emerges from a totally silent background, with breathtaking detail resolution and accurate spatial information. DIGITAL SECTION ANALOG SECTION CD Focus Coil & Tracking Coil Optical Head Spindle Motor Sled Motor Disc Clamp & Tray Motor RF Signal Processor Spindle Servo Controller Focus & Tracking Servo Controller Master Control Computer Key Matrix EFM Decoder & Error Corrector From Remote CommanderDisplay Driver Infrared Receiver Clock Generator Display Digital Audio Interface Encoder Digital Audio Interface Decoder Coaxial Transmitter Optical Transmitter Pulse Amp Optical ReceiverCoaxial Optical Coaxial Optical Transport Outputs Digital Inputs MDS++ D/A Conversion System MDS++ D/A Conversion System 3-Pole Low-Pass Filter 3-Pole Low-Pass Filter 3-Pole Low-Pass Filter 3-Pole Low-Pass Filter 3-Pole Low-Pass Filter 3-Pole Low-Pass FilterUnbalanced Balanced Unbalanced Balanced Left Analog Outputs Right Analog Outputs Analog output [dB] Digital input [dB]
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n PCB assembly with transport outputs, digital inputs, MDS++ D/A converter circuitry, Direct Balanced Filter circuitry, balanced and unbalanced analog output, power supply circuitry, etc. Transport section features high-rigidity, high-precision CD drive Mechanism base Viscous dampers High-rigidity, high-precision dedicated CD Drive m Fully digital control of CD mechanism m Laser pickup with integrated RF amplifi er for drastically reduced noise interference m Power-on play feature allows automatic playback m Balanced drive circuitry for actuator control eliminates interaction with other circuits n Sturdy chassis absorbs external vibrations n Highly rigid and precise construction n Traverse mechanism with fl oating design and viscous damping n Integrated design with large bridge joined to mechanism base n Low center of gravity and effi cient vibration control n High-quality disc tray made from extruded aluminum, plus ultra quiet and smooth loading mechanism CD transport section features and functions n Supplied remote commander RC-100 provides access to direct play, input source selection, level con- trol, repeat play, program play and other functions. Bridge Traverse mechanism Disc tray