Accuphase DP 500 Brochure
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Dedicated high-end CD player for ultimate musical fi delity - New high-rigidity, high-precision drive mechanism optimized for CD reproduction. Processor section features MDS ++ type D/A converter with four parallel DACs. Independent construction of transport section and digital processor. One set each of coaxial and optical connectors for digital input and transport output. The Compact Disc format with its 20-year history offers an unsurpassed wealth of musical treasures. Audiophiles the world over therefore covet the Accuphase lineup of high-end dedicated CD players. As the latest entry in this category, the DP-500 features a CD drive mechanism for the fi rst time developed in house, of course with our famous dedication to quality and attention to detail. Combine this with the latest digital signal processing technology, and the result is a breathtaking CD player that will make you rediscover the joys of music. The CD mechanism in the DP-500 was developed with a simple yet demanding aim: extract the information encoded on the CD one-hundred percent. Using all of its accumulated know-how and expertise, Accuphase has created an extremely rigid and ultra precise transport mechanism that attains new levels of performance. The processor section employs four strictly selected high-performance delta-sigma devices operating in parallel, forming a further refi ned MDS++ D/A conversion system. The analog fi lter, which has a signifi cant infl uence on sound quality, is a so-called Direct Balanced Filter that provides totally separate analog low-pass fi ltering (5-pole Butterworth) for the balanced and unbalanced signal paths. This brings out the full musical potential of the CD. The outstanding sound and high performance of the D/A converter section can be accessed also by external equipment. A set of optical and coaxial digital inputs accepts digital signals from other components, for processing with the highest musical accuracy. Coaxial input indication Optical input indication Focus Coil & Tracking Coil Optical Head Spindle Motor Sled Motor Disc Clamp & Tray Motor RF Signal Processor Spindle Servo Controller Focus & Tracking Servo Controller EFM Decoder & Error Corrector Clock Generator Master Control ComputerDisplay Driver Infrared Receiver Key Matrix From Remote CommanderDisplay DIGITAL SECTION Digital Audio Interface Encoder Digital Audio Interface Decoder Coaxial Transmitter Optical Transmitter Pulse Amp Optical ReceiverCoaxial Optical Coaxial Optical Transport Outputs Digital Inputs ANALOG SECTION Left Analog Outputs Right Analog Outputs Unbalanced Balanced Unbalanced Balanced 5-Pole Low-Pass Filter 5-Pole Low-Pass Filter 5-Pole Low-Pass Filter 5-Pole Low-Pass Filter 5-Pole Low-Pass Filter 5-Pole Low-Pass Filter MDS++ D/A Conversion System MDS++ D/A Conversion System Block diagram of DP-500 MDS++ D/A converter MDS (Multiple Delta Sigma) is a revolutionary design which employs several delta sigma type converters in a parallel confi guration. In the combined output of these multiple converters, conversion errors cancel each other out, resulting in a drastic improvement in all relevant aspects of converter performance such as accuracy, S/N ratio, dynamic range, lin- earity, and THD. In the DP-500, four delta sigma type PCM1796 convert- ers (made by Texas In- struments) are driven in parallel. Compared to a single converter, this re- sults in an overall perfor- mance improvement by a factor of 2 (= √4). 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 cur- rent summing and volt- age summing is used, resulting in even better stability and top-notch performance. The music emerges from a totally silent background, with breathtaking detail resolution and accurate spatial information. Signal Conversion errorNote the ratio between signal and conversion error. In the MDS output, the error is very small in relation to the signal. (Signal) Digital input MDS type D /A converter principle MDS output Block diagram of MDS++ converter in DP-500 (Normal phase output) (Reverse phase output)I (current) / V (voltage) converter Current summing Voltage summingSubtractionDAC output (Conversion error) Linearity (digital input vs. analog output) Analog output LINEARITY Digital input
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Transport section features newly developed high-rigidity, high-precision CD drive In order to extract the minute bits of information from the rapidly spinning disc and decode these accurately into a digital signal of high purity, vibrations emanating from the rotating medium as well as external mechanical vibrations must be minimized. At the same time, the prevention of resonances is also highly important. In the DP-500, the CD drive base is mounted fi rmly to a strong metal frame, forming a highly rigid chassis construction. Conversely, the traverse mechanism, an integrated structure consisting of the optical assembly including laser pickup and rotating parts, is designed for extremely light weight and isolated by a fl oating suspension arrangement from the mechanism base. Specially selected material is used for viscous damping, supporting the traverse mechanism at four points. A large, sturdy bridge-type cover is joined to the mechanism base for reinforcement. The entire CD drive assembly is directly mounted to the bottom chassis, which in turn features four large cast iron insulator feet with superior damping characteristics. The result is a unit with a low center of gravity and excellent protection against all kinds of adverse infl uences from vibrations. Perfectly stable and quiet operation produces a signal of utmost accuracy. Sturdy chassis absorbs external vibrations Highly rigid and precise construction Traverse mechanism with fl oating design and viscous damping Integrated design with large bridge joined to mechanism base Low center of gravity and effi cient vibration control High-quality CD tray made of extruded aluminum, plus quiet and smooth disc loading mechanism High Carbon cast iron insulator feet with superior damping characteristics further enhance sound quality CD transport section features and functions Fully digital control of CD mechanism Laser pickup with integrated RF amplifi er for drastically reduced noise interference Balanced drive circuitry for actuator control eliminates interaction with other circuits Power-on play feature allows automatic playback Disc trayHigh-rigidity, high-precision dedicated CD drive Supplied remote commander RC-100 Provides access to direct play, input source selection, level control, repeat play, pro- gram play and other functions . Traverse mechanismBridge Mechanism base Viscous dampers