The Accuphase-developed high-rigidity, high-precision drive optimized for CD reproduction, along with a super-quiet and smooth disc loading mechanism ensure pure signal readout of the highest order. In the processor section, the MDS type D/A converter utilizes four DAC chips driven in parallel, and the filter amplifier features the newly developed ANCC (Accuphase Noise and Distortion Cancelling Circuit). CD transport section and digital processor are kept completely separate. In addition to a USB input, coaxial and optical connectors are provided for digital input and transport output. Quality construction and highly advanced digital technology fully reveal the potential of the CD medium and provide a listening experience that opens up new emotional depths even with familiar music sources.
The highly rigid CD drive employs a stiff construction that not only minimizes vibrations from the internal rotation but also absorbs any external vibrations, whether large or small. The rigid mechanism base is fully integrated with the massive and highly rigid chassis, resulting in a strong frame structure with elaborate and sophisticated construction.
MDS (Multiple Delta Sigma) is a revolutionary approach that employs several delta-sigma type D/A converters connected in parallel, for drastically improved performance. The same digital signal is supplied to each converter, and the output of the converters is summed before being sent to subsequent stages. In the DP-430, four converter circuits are used in parallel. This improves overall performance by a factor of about 2 (=√4) as compared to a single converter circuit. Because the performance improvement afforded by the MDS principle is independent of signal frequency and signal level, output signal noise at very low levels is also successfully minimized, a feat that is very difficult to achieve with conventional delta-sigma converters.
ANCC (Accuphase Noise and Distortion Cancelling Circuit) is a newly developed topology that improves performance by canceling noise and distortion components arising in an amplifier through subtraction at a following stage. THD is minimized, and noise performance is improved to the level of the canceling amplifier. Gain distribution is optimized through measures such as increasing the gain in the filter circuit's input stage, thereby elevating performance to a level that rivals the technology of higher-ranked models. The ANCC uses a low-noise OP amp (input converted noise voltage density 1.5 nV/ √Hz) which results in 30% better performance as compared to conventional circuitry.
If there is overlap between the rotation frequency of the spindle motor that turns the disc for playback and the resonance frequency of the viscous dampers that support the traverse mechanism, the risk of pickup dropouts increases and sound quality may deteriorate. It is therefore crucial to design the player components in such a way that resonance points within this frequency band are avoided. As a result of numerous listening tests and a series of careful vibration measurements, Accuphase engineers were able to achieve optimum isolation between the traverse mechanism and the CD drive itself. Contact sections of individual metal parts employ a sophisticated frame construction that further contributes to keeping resonances in the pickup vicinity to an absolute minimum.
Harnessing the high performance of the built-in processing section, data from other digital equipment can be supplied to the DP-430 via the digital inputs and played back with high sound quality.
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Format: Standard CD format
Quantization: 16 bits
Sampling frequency: 44.1 kHz
Error correction principle: CIRC
Number of channels: 2
Revolution speed: 500 to 200 rpm (CLV)
Scan velocity: 1.2 to 1.4 m/s, constant
Data Read Principle: Non-contact optical pickup
Laser Diode GaAlAs (double hetero-junction visible-spectrum semiconductor laser diode) Wavelength: 667 nm
Transport Outputs COAXIAL Format: IEC 60958 compliant
OPTICAL Format: JEITA CP-1212 compliant
Digital Inputs COAXIAL Format: IEC 60958 AES-3 compliant
Suitable cable: 75-ohm coaxial digital cable
OPTICAL Format: JEITA CP-1212 compliant
Suitable cable: JEITA standard optical fiber cable
USB Format: USB 2.0 Hi-Speed (480 Mbps) compliant
Suitable cable: USB 2.0 cable
COAXIAL: 32 kHz to 192 kHz (16 to 24 bits, 2-channel PCM)
OPTICAL: 32 kHz to 96 kHz (16 to 24 bits, 2-channel PCM)
USB:32 kHz to 384 kHz (16 to 32 bits, 2-channel PCM) 2.8224 MHz, 5.6448 MHz, 11.2896 MHz (1-bit 2-channel DSD) (11.2896 MHz: ASIO only) D/A Converter 4MDS principle
Frequency Response: 0.7 to 50,000 Hz +0, –3.0 dB
Total Harmonic Distortion: 0.0008% (20 to 20,000 Hz)
Signal-to-Noise Ratio: 117 dB
Dynamic Range: 113 dB
Channel Separation: 113 dB
Output Voltage and Impedance:
BALANCED: 2.5 V, 50 ohms, balanced XLR type
LINE: 2.5 V, 50 ohms, RCA phono jack
Output Level Control: 0 dB to –60.0 dB in 1-dB steps (digital)
Power Requirements: 120/220/230 V AC, 50/60 Hz (voltage as indicated on rear panel)
Power Consumption: 13 W
Max. Dimensions Width: 465 mm, Height: 151 mm, Depth: 393 mm
Mass: 14.0 kg, 20.0 kg in shipping carton