Accuphase DP-78 Brochure

m High-grade playback not only of SA-CDs but also of conventional
CDs m Single lens/twin pickup high-speed access mechanism
m Digital processor ready for 2.8224 MHz/1-bit and 192 kHz/24-bit

source formats m MDS++ D/A converter achieves minimal distortion
and outstanding S/N ratio m Transport section outputs and digital
inputs m HS-Link input/output capability via option boards

An SA-CD/CD player of the highest order – Processor section supports high-

DAC

DAC

quality formats such as 2.8224 MHz/1-bit and 192 kHz/24-bit. Further improved

MDS++ D/A converter. Transport section features dedicated DSP for digital

servo and single lens/twin pickup high-speed access mechanism. Separate

construction of transport and processor sections and respective connectors allow

independent use. HS-Link input/output boards available as option.

The Accuphase separate type player combo DP-100 and
DC-101 incorporating HS-Link connectivity is recognized
both in Japan and overseas as the ultimate setup for
SA-CD playback. It is the standard against which all others
have to be measured. And now, the superior technological
know-how gained through the development of this combo
has found another manifestation in the integrated SA-CD/
CD player DP-78. Incorporating the latest advances in
digital technology, the DP-78 is destined to take its place
at the top of its class. By concentrating solely on two­channel sources both in the SA-CD and CD format, the
DP-78 lets you fully enjoy the best that orthodox music
reproduction has to offer.

Ever since its introduction in 1999, the SA-CD catalog of
hybrid discs has been expanding. With its 2.8224 MHz/
1-bit format, the SA-CD stores four times as much
information as a conventional CD at 44.1 kHz/16-bit. This
allows it to realize dramatically superior physical
performance as manifested by wider frequency response
and dynamic range. The DP-78 is equipped to make full
use of this impressive potential. It will let you rediscover
the deep joy and satisfaction that a truly outstanding
musical experience can offer. But the DP-78 not only
handles the SA-CD format with impeccable finesse, it will
bring out the best from conventional CD sources as well.
Be prepared for a wholly new encounter with your entire
musical catalog.

The SA-CD/CD transport section and the processor
section of the DP-78 are kept entirely independent of each
other, to achieve optimum performance in each regard.
The transport features a single lens/twin pickup high-speed
access mechanism, combined with a digital servo
controlled by its own DSP. This advanced approach
assures highly accurate processing of the digital signal
and excellent support for high-sampling-frequency sources
including 2.8224 MHz/1-bit and 192 kHz/24-bit. The
DAC – a key component for determining sound quality –
incorporates a further refined version of the acclaimed
MDS principle, called MDS++. As a result of this non-holds­barred approach, the DP-78 projects a sound stage of
unprecedented realism and sheer musical perfection.

SA-CD/CD Transport Section Features and Functions

n Digital servo with dedicated DSP assures highly accurate signal pickup for SA-CDs and CDs

n Plays also regular CDs with outstanding quality

n Single lens/twin pickup mechanism minimizes access time

n Support for text data display including disc title and artist name information

n Strong, precision-machined chassis with resonance and vibration resistant construction

n SA-CD/CD transport output via optional HS-Link Output Board DO2-HS1 (see connection example

below)

n “High Carbon” cast iron insulator feet with

superior damping characteristics further
enhance sound quality

n Multi-function remote commander

RC-100 supplied as standard equipment

n Dedicated coaxial and optical connectors

for CD signal output

Assembly with master

`

clock generator, DAI
encoder/decoder, ul­tra jitter-free PLL cir­cuit, and other digital
signal processing cir-

Transport section outputs

Connection example for effective use of SA-CD/CD transport

DO2-HS1

installed

HS-Link cable

DI2-HS1

installed

cuitry

DP-78

DC-330

DO2-HS1 installed in
OUTPUTS slot

Digital connection for multi-amped system

Using HS-Link, it is possible to keep the connection of DP-78 
DC-330  DF-45 entirely in the digital domain until directly before
the power amplifier. The various components are connected with
HS-Link cable.

DF-45

HS-Link cable

For 5-way con­figuration and
higher: to addi­tional DF-45

High

Analog output
(2-way configuration)

Low

Power amplifier

Power amplifier

Digital
Inputs

Option
Slots

SA-CD/ CD

Coaxial

Optical

Option 1

Option 2

SA-CD
Optical

Head

CD

Optical

Head

Motor

Driver

Accuphase Original Digital Interface

Digital
Signal

Processor

×

RF

Signal

Processor

Digital

&

Servo

Processor

Ultra

Jitter-Free

PLL

Interface
Decoder

2

DSP

CP-1201
Encoder

Clock

Generator

++

MDS

D/A Conversion System

DAC

×

6

++

MDS

D/A Conversion System

DAC

×

6

CP-1201

Driver

Key

Matrix

Master

Control

Computer

Infrared

Receiver

Linear Phase

Low-Pass

Filter

Linear Phase

Low-Pass

Filter

Display

Buffer

Buffer

DP-78 Block Diagram

Coaxial

Optical

Unbalanced

Balanced

Unbalanced

Balanced

Transport
Outputs

Left
Analog
Outputs

Right
Analog
Outputs

HS-Link is an ultra high-quality digital audio interface developed by
Accuphase using the latest digital signal transmission technology. It
supports send/receive verification for copyright protection. The LVDS
(Low Voltage Differential Signaling) principle allows a single dedicated
HS-Link cable to transmit signals using advanced digital audio formats
such as 2.8224 MHz/1-bit or 192 kHz/24-bit. Because digital audio
data are transmitted with utmost fidelity, the sound quality achieved
by HS-Link is outstanding.

Digital
Audio
Signal

HS-Link Block Diagram

HS-Link: High Speed Link

TIA/EIA-644
LVDS

Driver/Receiver
HS-Link
Encoder

Security

Control

RJ-45

Connector

Connector

TIA/EIA-644
LVDS
Driver/Receiver

RJ-45

TIA/EIA-568A CAT.5
STRAIGHT CABLE

HS-Link
Decoder

Security

Control

Digital
Audio
Signal

Further Refined MDS++ D/A Converter

The output signal is produced by an MDS++ Type D/A converter which

boasts ultimate performance and impeccable sound quality. MDS

(Multiple Delta Sigma) is a revolutionary design which employs several

delta sigma type converters in a parallel configuration for greatly

improved accuracy.

As is evident from the illustration, combining the output signal from

individual converters causes mutual cancellation of conversion errors,

resulting in a notable improvement in all relevant aspects of conversion

performance: accuracy, S/N ratio, dynamic range, linearity, and THD.

Digital
input

nn

n MDS type

nn

D/A converter
principle

DAC

#1

DAC

#2

DAC
#n-1

DAC

#n

Signal

Conversion error

S

1

e

1

S

2

e

2

Sn-

1

en-

1

S

n

e

n

Note the ratio between signal
and conversion error. In the
MDS output, the error is very
small in relation to the signal.

S

0 (Signal)

e

0

(Conversion
error)

MDS output

Other Functions and Features

The DP-78 uses six Analog Devices AD1955 delta sigma converters

in parallel, which affords an overall performance improvement by a
factor of 2.4 (√6).

The MDS++ type converter in the DP-78 (block diagram shown below)

features improved operation of the I-V (current-to-voltage) circuit and

uses a combination of current adding and voltage adding, to reduce

the load on the current adder. This results in better stability and further

improved performance. Music emerges from a totally silent background

and is reproduced with incredibly accurate spatial imaging.

Analog Output

[dB]

0

–

10

–

20

–

30

–

40

–

50

–

60

–

70

–

80

–

90

–

100

–

110

–

120

–

130

–

140

–

140

–

120–100–90–80–70–50–40–30–20–10 0

(Digital input vs. analog output)

LINEARITY

Linearity

Digital Input

Delta sigma type D/A converter

I (current)/V (voltage)

(Normal phase output)

DAC 1

(Reverse phase output)

DAC 2

DAC 3

(Normal phase output)

DAC 4

(Reverse phase output)

DAC 5

[dB]

DAC 6

converter

Current adder Voltage adder

nn

n Block diagram of MDS++ converter

nn

Subtraction DAC output

nn

n Supplied remote commander RC-100

nn

Functions include input switching, output

level adjustment, direct play, repeat,

program, shuffle, etc.

Digital Processor Section Features and Functions

The processor section incorporates the MDS++ D/A converter developed by
Accuphase, assuring optimum performance and sound quality. The performance
of the processor can be accessed also by external components, for digital
signal reproduction of the highest standard.

n Digital processor supports new generation formats

with high sampling rates such as 2.8224 MHz/1-bit
and 192 kHz/24-bit.

n MDS++ type D/A converter achieves stunning

performance and sound quality.

n Ultra jitter-free PLL circuit topology totally eliminates

adverse influences from jitter and pulse distortion.

n Fully separate processor section with coaxial and

optical digital inputs that support sampling
frequencies up to 96 kHz and 24-bit resolution.
HS-Link input board is available as an option.

n Digital level control with adjustment range of 0 dB to

–

60 dB.

n Third-order linear phase

analog filters ensure excel­lent phase characteristics.

n Balanced and unbalanced

analog outputs.

Digital demodulator IC

Digital input connectors

Analog output connectors

Option board type

The DP-78 allows separate use of its SA-CD/CD transport section and digital
processor section, for connection to other digital components. Besides the digital
input and output provided as standard equipment, there are also two option board
slots on the rear panel which accept various kinds of boards.

✻ For copyright reasons, the SA-CD signal does not appear at any other output

except HS-Link and can therefore not be recorded digitally.

DI2-HS1 DO2-HS1

Option board type

Digital Input/Output Board DIO-OC1
HPC Coaxial (ST) Input/Output Board DIO-ST1
AES/EBU Input/Output Board DIO-PRO1
HS-Link Output Board DO2-HS1
HS-Link Input Board DI2-HS1

n HS-Link cable HDL-15 (1.5 m)

(The HDL-15 is also available in 3 m, 5 m, 7.5 m, and 10 m lengths.)

nn

n Front panel

nn

[Guaranteed specifications measured according to JEITA standard CP-2402]
[Measurement disc: PHILIPS 3122-783-00632]

Guaranteed Specifications

Transport Section

mm

m Compatible disc formats 2-channel Super Audio CD

mm

mm

m Data read principle Non-contact optical pickup

mm
mm

m Laser diode wavelength SA-CD: 650 nm

mm

mm

m Transport outputs Format: JEITA CP-1201 compliant

mm

Digital Processor Section

mm

m Digital inputs COAXIAL Format: JEITA CP-1201/AES-3 compliant

mm

n n

n Rear panel

n n

Option board
expansion slots

mm

m D/A converter MDS++ type, 24-bits

mm
mm

m Frequency response 0.5 - 50,000 Hz +0,–3 dB

mm
mm

m Total harmonic distortion 0.0008% (20 to 20,000 Hz)

mm
mm

m Signal-to-noise ratio 114 dB

mm
mm

m Dynamic range 110 dB (24-bit input, low-pass filter off)

mm
mm

m Channel separation 108 dB (20 to 20,000 Hz)

mm
mm

m Output voltage and impedance BALANCED: 2.5 V at 50 ohms, balanced XLR type

mm

mm

m Output level control 0 to –60 dB, 1-dB steps (digital)

★

A Track/index indicator
B Time indicator
C Output level indicator
D Track search knob
E Input selector
F Power switch
G Disc tray
H Disc tray open/close button

Remarks

★

This product is available in versions for 120/230 V AC. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.

★

The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.

I Play button
J Pause button
K Stop button
L SA-CD/CD selector button
M Analog output connectors (unbalanced/balanced)
N Digital input connectors (coaxial, optical)
O Transport output connectors (coaxial, optical)

★

P AC inlet

mm

General

mm

m Power requirements AC 120 V /230V (voltage as indicated on rear panel)

mm

mm

m Power consumption 25 W

mm
mm

m Maximum dimensions Width 465 mm (18-5/16”)

mm

mm

m Mass 18.4 kg (40.6 lbs) net

mm

mm

m Supplied Remote Commander RC-100

mm

Remote control principle: infrared pulse
Power supply: Two IEC R03 (size AAA) batteries
Max. dimensions: 56 mm × 175 mm × 26 mm
Mass: 155 g (including batteries)

CD

CD: 780 nm

COAXIAL: 0.5 Vp-p, 75 ohms
OPTICAL:–21 to –15 dBm, wavelength 660 nm

OPTICAL Format: JEITA CP-1201 compliant
Sampling frequencies

32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz

(16 to 24-bits, 2-channel PCM)

[Implemented by option board]

176.4 kHz, 192 kHz (24-bits, 2-channel PCM)

2.8224 MHz (1-bit 2-channel DSD)

UNBALANCED: 2.5 V at 50 ohms, RCA phono jack

50/60 Hz

Height 150 mm (5-7/8”)
Depth 397 mm (15-5/8”)

24.0 kg (53.0 lbs) in shipping carton

n Supplied accessories:

• AC power cord

• Remote commander RC-100

• Audio cable with plugs (1 m)

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

http://www.accuphase.com/

J0511Y PRINTED IN JAPAN 850-0149-00 (AD1)