● 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 totally separate line and balanced signal
paths ● Balanced output phase selector ● Digital interface with USB input● Transport outputs and digital inputs allow insertion of DG-48 into signal
path for sound field correction ● Numeric indication of sampling frequency

Dedicated CD Player with high-precision CD drive and advanced processor —Exquisite CD tray made of extruded aluminum, plus quiet and smooth disc loadingmechanism. Processor section with MDS++ type D/A converter featuring four
circuits driven in parallel. Fully separate CD transport and processor section, eachwith coaxial, optical, and USB (input only) connectors. Coaxial and USB inputs
support signals up to 192 kHz sampling frequency and 24-bit resolution.
For its high-end dedicated CD player model DP-510, Accuphase developed a CD
drive optimized for superb reproduction performance, which gained a high reputation in
the audio world. The DP-410 is a successor model to the DP-400, but it also inherits
the advanced know-how of the DP-510, offering enhanced performance and the latest
digital technology to bring out all that the Compact Disc format has to offer. Manyaudiophiles have extensive CD collections and they want to get the best and most
up-to-date reproduction quality possible. The DP-410 lets the listener explore the finest
nuances of recordings, making them sound better than ever heard before.
The Accuphase-developed CD drive in the DP-410 features an extremely rigid andultra precise transport mechanism that attains new levels of performance. Internal andexternal resonances and vibrations are reliably absorbed by the advanced chassis
construction. The low center of gravity and the quiet and smooth loading mechanism
also contribute to the quality of signal reproduction. The processor section featuressophisticated circuit design and the latest digital technology. The MDS++ D/A
approach developed by Accuphase has been further refined here, with four strictly
selected high-performance delta-sigma devices operating in parallel, forming a
conversion system of outstanding accuracy. Linearity at low signal levels is excellent,along with all other performance parameters that are crucial for bringing out the fullmusical potential of the CD. The analog filter provides totally separate filtering for theline and balanced signal paths, with 5-pole Butterworth type low-pass filters.
The outstanding sound and high performance of the D/A converter section can beaccessed also by external equipment. Three types of digital inputs (USB, coaxial, andoptical) accept digital signals from other components, for processing with the highest
musical accuracy. Furthermore, the transport and processor sections are configured
independently of each other. Even when the external processor input is used, the CDtransport continues to operate, enabling for example sound field compensation in thedigital domain, using the Digital Voicing Equalizer DG-48.

OpticalHeadRFSignal
Processor

Spindle MotorSpindle
ServoController

Sled Motor

Focus &Tracking ServoController

q Highly rigid construction with sturdy chassis absorbs external vibrations.
w “Traverse Mechanism” with floating design and viscous dampers.
e Integrated design with large bridge cover joined to mechanism base.
r Low center of gravity and efficient vibration control.
t High-quality CD tray made of extruded aluminum, plus quiet andsmooth disc loading mechanism.

■ Fully digital control of CD mechanism.
■ Balanced drive circuitry for actuator control eliminates interaction with other circuits.
■ Laser pickup with integrated RF amplifier for drastically reduced
noise interference.
■ Power-on play for automatic playback / Repeat playback function.
■ “High Carbon” cast iron insulator feet withsuperior damping characteristics furtherenhance sound quality.
High-rigidity, high-precision dedicated CD drive
Viscous dampers

BridgeTraversemechanism

Disc Clamp& Tray Motor

MasterControl
Computer

Display
Driver

KeyMatrix

Infrared
ReceiverMechanismbase

EFM Decoder& Error
Corrector

Disc tray
ClockGenerator

Digital processor section and overall functions and features

CD■ MDS++ D/A converter with four circuits
driven in parallel.

Display

Digital Audio
Interface
Decoder■ High-precision dedicated CD drive.

DIGITAL SECTION

Focus Coil&Tracking CoilDigital Audio
Interface
Encoder

CD transport section functions and features

CoaxialTransmitter

From Remote Commander■ Digital level control with attenuation to -60 dB.

COAXIAL

TRANSPORTOUTPUTS

OpticalTransmitter

OPTICAL

Pulse Amp

COAXIALOpticalReceiver

OPTICALUSB
ReceiverUSB■ Independent transport and processor
sections with coaxial, optical, and USB (inputonly) connectors.
■ Sampling frequency indication for transport
operation / external input.

DIGITALINPUTS

Sampling frequency indication example

ANALOG SECTION
MDS＋＋
D/A Conversion
System

Σ DAC
×45-Pole
Low-Pass Filter

LINELEFTANALOGOUTPUTS

5-PoleLow-Pass Filter

Electronic parts selected for high sound quality and reliability

USB chip

BALANCED

5-PoleLow-Pass Filter

MDS＋＋
D/A Conversion
System

Σ DAC
×45-Pole
Low-Pass Filter

LINERIGHT
ANALOGOUTPUTS

5-PoleLow-Pass Filter
BALANCED

5-PoleLow-Pass Filter

DP-410 Block Diagram

USB port
Digital audio interface chip
AK4118 drastically reduces jitter

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

Further refined MDS++ D/A converter
MDS (Multiple Delta Sigma) is arevolutionary design which employs several delta sigma typeconverters in a parallel configuration. The same digital signal issupplied to each converter. In thecombined output of these multiple
converters, the signal values areadded up, but conversion errors
cancel each other out, resulting inlower values than by simple addition. The ratio between the signal and conversion errors therefore increases significantly. Converter performance is improved in all relevant aspects.
In the DP-410, four delta sigma type PCM1796 converters (made by TexasInstruments) are driven in parallel. Compared to a single converter, this results inan overall performance improvement by a factor of 2 (= √4).
As shown in the illustration, the MDS++ converter in the DP-410 also features anenhanced current-to-voltage (I/V) converter for processing the D/A converter
output current, combined with a voltage summing circuit.
The result is even better stability and top-notch performance. The music emerges
from a totally silent background, with breathtaking detail resolution and accurate
spatial information.
SignalDAC#1

Conversion error

S1

Note the relationship between
magnitude of signal and conversion
error. In the MDS output, theconversion error is much smaller inrelation to the signal.

e1#2

I (Current) / V (Voltage) converter(Normal phase output)

I-V

DAC 1
CurrentSource(Reverse phase output)(Normal phase output)

DAC 2I-V(Normal phase output)

Digitalinput

S0 (Signal)
e2

#ｎ-1

e0

Sn-1

(Conversionerror)

en-1
#ｎSn

MDS output

en■ Operation principle of MDS type converter

Delta sigma D/Aconverter PCM1796

Subtraction

CurrentSource(Reverse phase output)(Normal phase output)

DAC 4

DAC output

I-V(Reverse phase output)

Current summing

4 circuits driven in parallel

Voltage summing

Block Diagram of MDS++ Converter in DP-410
THD+NOISE vs FREQUENCY〔%〕0.10000.05000.03000.0200−20−400.0100−600.0050
0.00300.0020−800.0010

0.0001

LINEARITY

Analog output〔dB〕0−100−12020 3050

100200500

1k

2k 3k

5k10k

THD (+ Noise) vs. Frequency Response

Digitalinput＋I-V

DAC 3

0.00050.00030.0002S2−(Reverse phase output)

20k
〔Hz〕

−140−140−120−100−80−60−40−200Digital input 〔dB〕

Linearity (Digital Input vs. Analog Output)■ Supplied remotecommander RC-110

Provides access to direct play,repeat play, input source
selection, level control, andother functions.

Connection example for DG-48

Direct Balanced Filter with separate line/balanced circuitry

Using the USB port

The DG-48 can be connected (by coaxialor optical fiber cable) between thetransport output and the digital input of theDP-410, for sound field processing of theCD transport signal in the digital domain.

The analog filter circuitry that removes aliasing noise in the very
high frequency range employs 5-pole Butterworth analog filterswith extremely flat frequency response in the passband. In orderto prevent unwanted interaction, completely separate low-passfilters (LPF) are provided for the line and balanced signal paths.

This port enables connection to a computer with a downloaded
music library, for playback of high-resolution music data (up tosampling frequency 192 kHz/24 bit) with high quality.

＋ 5-Pole

Butterworth− LPF

DIGITAL OUT

DIGITAL INDigitalinput

DG-48＋−x4MDS++D/A Conversion
SystemButterworth− LPF＋ 5-Pole
Butterworth− LPF

Coaxial digital cable

Digital inputs＋ 5-PoleLineComputer

USB portAnalogoutputs＋USB cableBalancedUSB port

● Before using the USB port, it may
be necessary to install driver
software from the supplied USB
Utility Disc (CD-ROM), dependingon the computer.
● The capability for playback ofmusic data via USB depends on
the operating system and music
playback software of the computer.
● For information on USB settingsand connection, refer to thecomputer documentation.
Use a USB cable with Type B plug toconnect the USB port (Type B) of theDP-410 to the USB port on the computer−

Phase selector for balanced output

Transport outputs

Analog output

DP-410● In the factory default condition, the switch

Audio cable

is set to the left side (pin e positive).

● If the connected preamplifier or integrated

amplifier uses a “pin w positive” arrangement, change the setting of the switch.

DP-410■ Front panelqPreamplifierw

DP-410 GUARANTEED SPECIFICATIONS
specifications are measured according to the JEITA standard CP-2402A.
* Guaranteed* Measurement disc: JEITA CP-2403A

CD Transport

er t yu

i o !0 !1 !2 !3 !4● FormatStandard CD format
Quantization:
16 bits
Sampling frequency: 44.1 kHz
Error correction principle: CIRC
Number of channels: 2Revolution speed:
500 - 200 rpm (CLV)
Scan velocity:
1.2 - 1.4 m/s, constant● Data read method● Laser● Transport output level

Non-contact optical pickup
GaAlAs (double hetero-junction visible-spectrum semiconductor laser diode)
COAXIAL (IEC 60958):
0.5 Vp-p, 75 ohms
OPTICAL (JEITA CP-1212): Light output -21 to -15 dBm
Wavelength 660 nm■ Rear panel

Processor● Digital input!5!6q Input selection indicator
COAXIAL / OPTICAL / USBw Repeat indicator
ALL / ONEe Power switchr Input selector buttont Play track indicatory Total track indicatoru Disc tray
i Time indicatoroDisc tray open/close button!0 Output level indicator!1Play button!2
Pause button!3
BACK/NEXT track
search buttons!4
Stop button!7!8!9 ★

!5 Digital input connectors (USB, optical, coaxial)!6 Transport output connectors (optical, coaxial)!7 Balanced output phase selector switch!8 Analog outputs
Balanced output connectors
q Ground w Inverted [-] e Non-inverted [+](Can be changed with phase selector switch !7 )Line output connectors!9 AC power connector★

Supplied accessories● AC power cord

● Audio cable with plugs (1 meter)● Remote Commander RC-110● USB Utility CD-ROM● USB Setup Guide

COAXIALOPTICALUSB

Format: IEC 60958 compliant
Format: JEITA COMPUTER-1212 compliant
Format: USB 2.0 Hi-Speed(480 Mbps) compliant
Sampling frequencies
32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz,
176.4 kHz, 192 kHz (all 16 - 24 bit 2ch PCM)
(OPTICAL 32 kHz - 96 kHz)● D/A converter
24 bits, 4MDS++ type
● Frequency response
0.7 - 50,000 Hz +0, -3 dB● Total harmonic distortion Max. 0.001% (20 - 20,000 Hz, 24-bit input)● Signal-to-noise ratio
114 dB or better● Dynamic range
110 dB or better (24-bit input)● Channel separation
110 dB or better● Output voltage and impedance BALANCED: 2.5 V, 50 ohms, balanced XLR typeLINE:
2.5 V, 50 ohms, RCA type phono jack● Output level control
0 to -60 dB in 1-dB steps (digital type)

General● Power requirements● Power consumption● Max. dimensions● Mass120/220/230 V AC, 50/60 Hz(Voltage as indicated on rear panel)
120/220 V AC: 10 W
230 V AC:
13 W
Width 465 mm (18-5/16")
Height 151 mm (5-15/16")
Depth 393 mm (15-1/2")
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.
★ 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.

●Specifications and design subject to change without notice for improvements.

http://www.accuphase.com

C1305Y PRINTED IN JAPAN

850-2179-00（B1）