● High-grade SA-CD/CD drive ● MDSD type D/A converter using eight parallel devices● Support for playback of DSD discs with DSF file format ● "Direct Balanced Filter" withseparate balanced and unbalanced signal paths ● HS-LINK and USB digital interfaces ● EXT
DSP inputs and outputs allow insertion of DG-58 into signal path for sound field correction● Phase selector for balanced outputs ● Numeric indication of sampling frequency

The superlative integrated SA-CD/CD player
High-rigidity, high-precision
SA-CD/CD drive combined with exquisite disc tray and ultra-smooth loadingmechanism. Innovative MDSD (Multiple Double Speed DSD) processing
circuitry constitutes a moving average filter for straight D/A conversion of DSD
signal. USB port and superior quality digital audio interface HS-LINK.

In 2011, Accuphase released the ultra high-end
separate type SA-CD/CD player combo DP-900 andDC-901, incorporating latest digital technology andembodying the company's unwavering passion forpristine sound. The components were the second
entry in the company's 40th anniversary commemorative model lineup. Their superlative musicality and boldreinvention of what digital audio can be caused asensation in the audio community, garnering highpraise in Japan and abroad and earning them a placeas the new SA-CD reference. The DP-720 is an
integrated SA-CD/CD player that reflects the superb
know-how of the DP-900/DC-901 combo, aiming for
top performance in the integrated category. As
appropriate for a high-end player, the DP-720 features
the latest versions of major Accuphase in-housedevelopments: a high-precision SA-CD/CD drive andan advanced MDSD type D/A converter. The
high-precision SA-CD/CD drive inherits vital know-how
and technology from the DP-900, realizing the idealtransport design for bringing out the full potential of theSA-CD medium. The ultra-heavy, high-rigidity,
high-precision mechanism has been finely honed tofurther perfection.
The digital processor section is optimally suited tohandle the SA-CD format, using cutting-edge circuit
topology and advanced digital technology to further
enhance the innovative MDSD (Multiple DoubleSpeedDSD) principle for direct D/A conversion of the DSD
signal. With MDSD, multiple DSD signals are delayedthrough digital processing in an ultra-high-speed
FPGA (Field Programmable Gate Array) and thenprocessed by separate D/A converters driven inparallel. After D/A conversion, summation of themultiple data results in a moving-average filter circuitwith double-speed accuracy. An important characteristic of MDSD is the use of MDS++ type D/A converters.
This keeps conversion errors to an absolute minimum
and at the same time implements a 5-pole high-cut
filter with completely linear phase characteristics.
The end result is a digital signal of impeccable quality.
It allows the music to unfold with awe-inspiring expressiveness, fully harnessing the ultimate potential of theSA-CD format. The external design with gold hue
panel face and natural wood grain cabinet exudes anelegant, warm atmosphere of understated elegance.
As an integrated SA-CD/CD player of the highest
order, the DP-720 employs only the best in materials
and parts throughout, specially selected for sonicperformance. The immense amount of information
conveyed by this player truly has the power to movethe listener.

Features and Functions of Transport Section
High-grade SA-CD/CD driveAluminum alloy bridge

8 mm thick aluminumframe

Traverse mechanism

Disc trayMechanismbase

8 mm thick heavyweightbottom plate
Dual stay bearing
shafts

Newly developed viscous dampers■ High-grade SA-CD/CD drive.
(1) Highly rigid and precise construction with sturdy, heavyweight chassis toabsorb external vibrations.
(2) Newly developed "Traverse Mechanism" with floating design and viscous damping.
(3) Large bridge cover.
(4) Effective control of vibrations enhanced by low center of gravity.
(5) High-quality disc tray extruded from an aluminum block, plus super-quietsmooth disc loading mechanism.

Chucking magnet■ SA-CD/CD transport outputs ultra pure digital signal.
■ New chucking magnet design using neodymium with high flux density and 8-polemagnetized yoke to firmly and evenly grasp the turntable and prevent disc wobble.
■ Accuphase proprietary digital audio interface HS-LINK (carries both SA-CDand CD signal).
■ Display of external input sampling frequency (kHz) during transport operation.
Sampling frequency display example■ High-speed access mechanism with single lens/twin laserLINEARITY
diode pickup.
■ "Advanced High Carbon" cast iron insulator feet with superior
damping characteristics ensure quiet operation and further
enhance sound quality.
■ Support for playback of DSD discs with DSF file format,
recorded on a computer or similar.
Analog output[dB] 0−20−40−60−80−100−120

SA-CD
OpticalHead

DP-720 Block Diagram

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

SA-CD / CDCD
OpticalHeadRF
Signal
Processor

Motor&DriverDigital
ServoProcessor

HS-LINK
Decoder

CoaxialFrom
Remote CommanderDelay
Delay
DSD Signal

USB
ReceiverUSB
HS-LINK
Encoder

External
DSP
Inputs

Display

CoaxialTransmitter

Interface
Decoder

MDS＋＋
D/A Conversion

Σ DAC×8

Delay
DSD Signal

HS-LINK
Decoder
HS-LINK

PCM Signal

CoaxialReceiver5-PoleButterworth
Low-Pass Filter

MDS＋＋

5-PoleButterworth
Low-Pass Filter

D/A Conversion

Σ DAC
×80.0030
0.00200.0010Line

Left
AnalogOutputs

5-PoleButterworth
Low-Pass Filter

5-PoleButterworth
Low-Pass Filter

MDSD（Multiple Double Speed DSD）System
Delay

0.01000.0050PCM Signal

Coaxial

Coaxial0.03000.0200

KeyMatrix

OpticalReceiverOpticalOutputs HS-LINK

0.1000MDSD（Multiple Double Speed DSD）System

CoaxialReceiver

THD + NOISE vs FREQUENCY〔%〕0.0500HS-LINKDigital
InputsMasterControl
Computer

Infrared
Receiver0.00030.00020.0001
2030

50

100

200

500

1k

2k 3k

5k

10k

20k
〔Hz〕

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

Line

Right
AnalogOutputs

5-PoleButterworth
Low-Pass Filter

5-PoleButterworth
Low-Pass Filter

0.0005

Balanced■ Assembly with digital signal
processing circuits, D/A converter,transport control and power supplycircuits etc.

Features and Functions of Digital Processor Section■ MDSD (Multiple Double Speed DSD) implements innovative
digital signal processing.
■ Digital level control allows adjustment down to -80 dB.
■ "Direct Balanced Filter" configuration for analog filter.
■ MDS++ type D/A converter using eight parallel devices.
■ Separate transport and processor sections. Versatile
input/output configuration with HS-LINK, coaxial, optical(input only), and USB (input only) connectors.

Analog output circuitry on glass cloth fluorocarbon resin PCBs

Parts selected for high sound quality and reliability

EXTERNAL DSP assemblyPower supply circuit assembly

Phase selector■ Analog output printed circuit boards made from glass cloth fluorocarbon resinwith low dielectric constant and minimum loss.
■ Phase selector for balanced outputs.
■ Balanced and unbalanced analog outputs (1 set each).
■ Massive wood cabinet with natural grain finish.

Innovative Digital Processing: MDSD(Multiple Double Speed DSD)
Playback Principle
The DP-720 employs MDS++ type D/Aconverters in an MDSD movingaverage filter circuit which achieves
stunning performance and soundquality. Eight high-performance
32-bit Hyperstream™ DAC chips
32-bit Hyperstream™ DAC chips(ES9018 from ESS Technology Inc.) are driven in parallel, thereby
improving overall performance by a factor of about 3, 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 isalso successfully minimized, a feat that is very difficult to achievewith conventional delta-sigma converters. By locating a
dedicated quartz oscillator very close to each ES9018 chipand driving the D/A converter as a master clock inasynchronous mode, jitter is also significantlyreduced.
■ Supplied RemoteCommander RC-110
Gives access to various
functions including directplay, repeat, input
switching, and levelcontrol.

Double Speed Moving Average Filter Circuit
Digital input(Input signal slightly shifted by 7 delay devices)

DSD signal

MDS＋＋ D/A Conversion System
Group 1Delay
device2.8224MHz
1bit

Delaydevice
DelaydeviceDelaydevice1/ 2 Delayed by 1/2 clock cycle

DAC 1

1 Delayed by 1 clock cycle

DAC 2

1 Delayed by 1 clock cycleNormal phase
outputReverse phase
outputI-V
converter

DAC 3
DAC 4＋

7.5 Delayed by 7.5 clock cycles

DAC output

Reference waveform

Delaydevice
Delaydevice−DAC 5

Delaydevice
1 Delayed by 1 clock cycle

1 Delayed by 1 clock cycle

DAC 6
DAC 7I-V
converter
Normal phase
output

DAC 87 Delayed by 7 clock cycles

Group 2

Reverse phase
outputCurrent summing /I-V conversion

Overall summing of
8 DAC signals

— Accuphase Exclusive Digital Interface — HS-LINK: High Speed LINK

Using the USB port

HS-LINK is an ultra high-quality digital audio interface developed by Accuphase using latest digital signaltransmission technology. It supports send/receive verification for copyright protection. The LVDS (Low VoltageDifferential Signaling) principle allows a single dedicated HS-LINK cable to transmit all audio data with utmost
fidelity, including conventional digital signals as well as 2.8224 MHz/1-bit and 192 kHz/24-bit signals.

Use a USB cable with Type B plug to connect the USB port
(Type B) of the DP-720 to the USB port on the computer.

DigitalAudioSignal

HS-LINK
Encoder
RJ-45Connector

HS-LINKcable

HS-LINK
Decoder● Depending on the computer, it may
be necessary to install software forusing the USB port from thesupplied USB Utility CD-ROM.

DigitalAudioSignal

RJ-45Connector

Computer

Security
Control● For information on settings for USB,refer to the computer documentation.

Security
Control
TIA/EIA-644
LVDS
Driver/ReceiverUSB● The capability for playback ofmusic data via USB depends on
the operating system and music
playback software of the computer.

USB cable

TIA/EIA-644
LVDS
Driver/Receiver

HS-LINK Signal Transmission Block Diagram

USB

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

DG-58 Connection Example
The DG-58 can be connected between the transport outputs and digital inputs of theDP-720 (using HS-LINK or coaxial connection). This allows sound field compensationof the signal selected with the input selector button in the digital domain.
HS-LINK cable connection
supports transmission of both
SA-CD and CD signals.

DIGITAL OUT

Analog output

DIGITAL IN

DG-58
DP-720EXTERNAL DSP INPUTS

Audiocable

HS-LINK cableEXTERNAL DSP OUTPUTS

DP-720Preamplifier■ Front panel

qw e rDP-720 Guaranteed Specifications
specifications measured according to JEITA standard CP-2402A* Guaranteed* Measurement disc: PHILIPS 3122-783-00632

Transport section● Compatible disc formats 2-channel Super Audio CD
CD
DSD disc (DSF file format)● Data read principle
Non-contact optical pickup● Laser diode wavelength SA-CD:
650 nmCD:
780 nm
● EXT DSP
HS-LINK Connector type: RJ-45(Transport output signal)
Suitable cable: Dedicated HS-LINK cable
COAXIAL Format:
IEC 60958 complianttyu

i o !0!1!2 !3 !4 !5 !6 !7 !8■ Rear panel!9@0@1 @2★

@3q Input type indicators!8 STOP: Stop button
HS-LINK / COAXIAL / OPTICAL / USB !9 Digital inputs (USB, optical, coaxial, HS-LINK)
w EXT DSP indicator@0 EXTERNAL DSP input / output connectors
e SA-CD indicator@1 Analog outputs
r REPEAT indicator
Balanced output connectors
t Power switch
q Ground w Inverted (−) e Non-inverted (+)
y EXT DSP ON/OFF button(Phase can be changed with balanced outputu SA-CD/CD selector button
polarity selector @2)
i Input selector buttonLine output connectors
o Playing track indicator@2 Balanced output polarity selector❿ Total track number indicator@3 AC power connector ★
⓫ Disc tray
⓬ Time indicator■ Supplied accessories⓭
Disc tray open / close button● AC power cord
⓮ Output level indicator● Audio cable with plugs (1 m)⓯
PLAY: Play button⓰ PAUSE: Pause button● Remote Commander RC-110⓱
BACK /NEXT: Track● USB Utility CDsearch buttons● USB Setup Guide

Digital processor section● Digital inputs

HS-LINK Connector type: RJ-45
Suitable cable: Dedicated HS-LINK cable
COAXIAL Format:
IEC 60958 compliant
OPTICAL Format:
JEITA CP-1212 compliant
USB
Format:USB 2.0 Hi-Speed(480 Mbps) compliant● EXT DSP
HS-LINK Connector type: RJ-45
Suitable cable: Dedicated HS-LINK cable
SA-CD:
2.8224 MHz/1bit DSD
CD:
44.1kHz/16 bit PCM
COAXIAL Format:
IEC 60958 compliantCD:
44.1kHz/16 bit PCM● Sampling frequency
32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz,176.4 kHz,192 kHz (16 to 24 bits, 2-channel PCM)
(OPTICAL: 32 kHz to 96 kHz)
[Only via HS-LINK] 2.8224 MHz (1-bit 2-channel DSD)
● D/A converter
8 MDSD type converters (DSD signal)
8 MDS++ type converters (PCM signal)● Frequency response 0.5 to 50,000 Hz +0, -3.0 dB● Total harmonic distortion 0.0006% (20 to 20,000 Hz)● Signal-to-noise ratio 119 dB● Dynamic range
116 dB (24-bit input, low-pass filter off)
● Channel separation
117 dB (20 to 20,000 Hz)● Output voltage andBALANCED: 2.5 V 50 ohms, balanced XLR typeimpedanceLINE:
2.5 V 50 ohms, RCA phono jack● Output level control
0 dB to -80 dB in 1-dB steps (digital)

General● Power requirements

120 V, 220 V, 230 V AC
(voltage as indicated on rear panel), 50/60 Hz● Power consumption
31 W, Standby: 0.3 W● Maximum dimensions Width 477 mm (18.8")
Height 156 mm (6.1")
Depth 394 mm (15.5")● Mass28.0 kg (61.7 lbs) net
34.0 kg (75.0 lbs) in shipping carton● Cleaning clothRemarks★ 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

L1305Y PRINTED IN JAPAN

850-2185-00（B1）