● High-precision CD drive ● High-quality CD tray and ultra quiet and smoothloading mechanism ● MDS D/A converter with four circuits driven in parallel● Direct Balanced Filter with separate line and balanced signal paths● Phase selector for balanced outputs ● Digital interface with USB input● Transport outputs and digital inputs allow insertion of DG-58 into signal pathfor sound field correction ● Sampling frequency and quantization bit display

Dedicated CD player designed for the ultimate in sonic excellence — High-precision
CD drive mechanism combined with high-performance processor section featuring
support for 384 kHz/32-bit PCM and 11.2896 MHz/1-bit DSD.
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, theMDS 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 Technology of Precision

Features and Functions of Transport Section

Features and Functions of Digital Processor Section■ Highly rigid and precise CD drive unaffected by external vibrations
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 themassive and highly rigid chassis, resulting in a strong frame structure withelaborate and sophisticated construction.

■ MDS type D/A converter
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 afactor of about 2 (=√4) as compared to a single converter circuit. Because the performance
improvement afforded by theMDS principle is independent of MDS type D/A converter
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.
■ Four high-performance AK4490EQ delta-sigma D/Aconverter chips made by Asahi Kasei Microdevices■ Filter amplifier with ANCC topology
AK4490EQ delta-sigma
type D/A converter chips● ANCC (Accuphase Noise and Distortion Cancelling
Circuit) is a newly developed topology that improves performance by canceling noise anddistortion 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 ofhigher-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.
■ SA9227A chip from Savitech for USB input realizes support for DSD256

High-rigidity, high-precision dedicated CD drive

Bridge coverTraverse
mechanism

Block diagram of MDS converter in DP-430(Normal phase output)

Mechanism base

Disc tray

DAC 1(Reverse phase output)(Normal phase output)■ Floating type traverse mechanism (laser pickup unit)
Mechanical isolation between the traverse mechanism and the CD drive isprovided by silicone type viscous dampers whose shape and material
composition have been carefully optimized.

DAC 2＋(Reverse phase output)－(Normal phase output)

Digital Inputs

DAC 3DACOutput

Subtraction(Reverse phase output)(Normal phase output)

DAC 4(Reverse phase output)

4 circuits driven in parallel
Viscous dampers

Block diagram of ANCC

Floating type traverse mechanism■ Large bridge cover
The massive bridge cover which also comprises the magnetic chucking
mechanism for the disc is firmly mounted on the mechanism base, forming astrong integrated structure. To ensure quiet operation, a special design isimplemented to reduce wind noise due to the air flow caused by the rotating disc.
■ Non-resonant design
If there is overlap between the rotation frequency of the spindle motor that turns the discfor playback and the resonance frequency of the viscous dampers that support thetraverse 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 toachieve optimum isolation between the traverse mechanism and the CD drive itself.
Contact sections of individual metal parts employ a sophisticated frame construction thatfurther contributes to keeping resonances in the pickup vicinity to an absolute minimum.
■ Low center of gravity■ High-quality disc tray extruded from an aluminum block, plus
super-quiet and smooth disc loading mechanism
THD + NOISE vs. FREQUENCY[%]
0.10.070.05

β＋Input＋＋＋－A＋Output－

Main Amplifier

1/ β
Sub Amplifier

Block diagram of Direct Balanced Filter circuitry＋ 4-Pole

Butterworth－ LPF⊿Σ DAC＋DigitalInput

×4－MDSD/A Conversion
System＋ 4-Pole

Butterworth

Line＋－ LPF－ 4-Pole

Butterworth＋ LPF－AnalogOutputs

Balanced

−20

0.03
0.02

−400.01
0.007
0.005

−60

0.003
0.002

−80

0.001
0.00070.0005−1000.0003
0.00020.0001

LINEARITY

Analog output [dB]0Voltage summing−120203050 70 100

2005001k2k3k5k 7k 10k

Total harmonic distortion (incl. noise)vs. frequency response

20k[Hz]−140−140−120−100−80−60−40−200
Digital input [dB]Linearity(digital input vs. analog output)

USB chip SA9227A

Circuit assembly with transport outputs, digital inputs, D/A converter, ANCC,
Direct Balanced Filter circuitry, line/balanced analog outputs, power supply
circuitry etc.

Advanced Features■ Power supply optimized for performance and sound quality
The power transformer has separate windings for supplying the analog and digital sections. A strengthened
reference power supply for the D/A converter ensures
stability and minimizes noise. Both in terms of performance and sound quality, the results are outstanding.
■ Display can show sampling frequency and numberof quantization bits
Besides showing track numbers and elapsed playing
time, the display can also indicate the sampling frequency and the number of quantization bits when using theexternal input and during CD playback.

Display indication example
Actual measured sampling frequency and quantization bits
are indicated during transport operation and use of externalinput.
Low-noise power supply■ Digital level control allows adjustment down to –60 dB
The level control employs the digital principle for optimum
accuracy and minimal degradation of sound quality. Integrationof the level control function in the D/A converter prevents noiseand provides a wide adjustment range down to –60 dB.

DP-430 Block Diagram
Disc Clamp& Tray Motor

Sled Motor■ Digital inputs and outputs for COAXIAL, OPTICAL,and USB (input only)
Harnessing the high performance of the built-in processing section, data from other digital equipment can besupplied to the DP-430 via the digital inputs and playedback with high sound quality.

Focus Coil&Tracking CoilCD

OpticalHeadRF
Signal
Processor

Spindle MotorSpindle
ServoController■ High Carbon cast iron insulator feet with superior
damping characteristics further enhance sound quality

ClockGenerator■ Fully digital circuitry for mechanism control
DIGITALINPUTSUSB

USB
ReceiverOPTICAL

OpticalReceiver

COAXIAL

CoaxialReceiver

KeyMatrix

Digital Audio
Interface
Encoder

EFM Decoder& Error
Corrector

MDS
D/A Conversion
System■ Analog outputs provide a choice of line level and balanced
types for shutting out external noise interference■ Phase selector for balanced output

MasterControl
Computer

Focus &Tracking Servo
Controller⊿Σ DAC×4

Display
Driver
Display

Infrared
ReceiverCoaxialTransmitter

COAXIAL

OpticalTransmitter

OPTICAL

4-PoleButterworth
Low-Pass Filter

MDS
D/A Conversion
System⊿Σ DAC
×4

TRANSPORTOUTPUTSLINELEFT
ANALOGOUTPUTS

4-PoleButterworth
Low-Pass Filter
4-PoleButterworth
Low-Pass Filter

Digital Audio
Interface
Decoder

From Remote Commander

4-PoleButterworth
Low-Pass Filter

BALANCED

LINE

RIGHT
ANALOGOUTPUTS

4-PoleButterworth
Low-Pass Filter
4-PoleButterworth
Low-Pass Filter

BALANCED

Phase selector■ Supplied remote commander RC-130

Gives access to various functions including
direct play, repeat play, input switching, andlevel control.

DG-58 connection example

Using the USB port

The DG-58 can be connected between the transport outputs and digital
inputs of the DP-430 (using the coaxial or optical connectors). This allows
sound field compensation of the signal from the CD transport in the digitaldomain.

The USB port (Type B) of the DP-430 allows connection to a computer via USB
cable (with Type B connector), for reproduction of music library data. Because
sampling frequencies up to 384 kHz/32-bit and 11.2896 MHz (1-bit DSD) aresupported, high-resolution music files can be reproduced with superior sound quality.
＊Depending on the computer, it may be necessary toinstall software for using the USB port from thesupplied "USB Utility 2" CD-ROM.
＊The capability for playback of music data via USB
depends on the operating system and music playback
software of the computer.
＊For information on settings for USB, please refer to thecomputer documentation.

＊Use the INPUT button on the DG-58 toselect either COAXIAL or OPTICAL.

DG-58
DIGITAL OUT

DIGITAL IN

ComputerUse either a coaxial
cable or optical fiber
cable for the connection,
as preferred.

DIGITALINPUTSUSB cable (with Type B connector)

Preamplifier

Coaxial cable

Audio cable
Balancedconnection

Audio cableLine connection

Balancedconnection

USB

Analog output

DP-430

Rear Panel

Frequency indicator
Repeat indicator
Total number of tracks /Time indicator Output level
Quantization bits

Input selector button
Disc tray

Fast
ReverseTransport outputs
COAXIAL / OPTICAL

Fast
Forward

Stop button

Disc tray open/close button＊ Guaranteed specifications measured according to JEITA standard CP-2402A

FormatStandard CD format
Quantization:
16 bits
Sampling frequency:
44.1 kHz
Error correction principle: CIRC
Number of channels:
2Revolution 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 Processor Section
COAXIALOPTICALUSB

Format:Suitable cable:
Format:Suitable cable:
Format:Suitable cable:Supplied accessories● Remote Commander RC-130● AC power cord

● Audio cable with plugs AL-10

Balanced output polarity selector

Analog outputs
AC power supplyconnector ★
BALANCED / LINE
Balanced output connectors
Pin ② –, Pin ③ +(Can be changed with phase selector switch)Line output connectors

Guaranteed Specifications

Transport Section

Digital Inputs

Digital inputs
COAXIAL / OPTICAL / USB

Play button
Pause button
Track search buttons
BACK,NEXT

Power switch

Line connection

Analog output

DP-430USB port (Type B)

Front Panel
Input indicator
Current track /sampling frequencyindicator

Preamplifier

Use either a balanced
cable or a line level
cable for the connection,
as preferred.

Use either a balanced
cable or a line level
cable for the connection,
as preferred.

Optical fiber cable

TRANSPORTOUTPUTSUSB

IEC 60958 AES-3 compliant
75-ohm coaxial digital cable
JEITA CP-1212 compliant
JEITA standard optical fiber cable
USB 2.0 Hi-Speed(480 Mbps) compliant
USB 2.0 cable

Sampling Frequencies

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)
USB32 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
0.7 to 50,000 Hz

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 typeLINE:
2.5 V, 50 ohms, RCA phono jack
0 dB to –60.0 dB in 1-dB steps (digital)
Output Level Control

GeneralPower Requirements
Power Consumption
Max. Dimensions● USB Utility 2 CD

● USB Utility 2 Setup Guide+0, –3.0 dB

Frequency Response

Mass

120/220/230 V AC, 50/60 Hz (voltage as indicated on rear panel)
13 W
Width: 465 mm (18.3˝)
Height: 151 mm (5.9˝)
Depth: 393 mm (15.5˝)
14.0 kg (30.9 lbs) net
20.0 kg (44.1 lbs) in shipping carton

Remarks★ This product is available in versions for 120/220/230 V AC. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
★ The 230 V version has an Eco Mode that switches power off after 120 minutes of inactivity.
★ The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.

●The specifications and appearance of this product are subject to change without notice.

5年間保証

C1705Y PRINTED IN JAPAN 850-2202-00（B1）