m MDS++ D/A converter achieves minimum distortion and superb
S/N ratio m Jitter-free high-performance digital demodulator m 3-poleanalog filter with outstanding phase characteristics m EXT DSP input/
output connectors m Two sets of digital inputs/outputs m Fully digital
control of CD mechanism m Balanced drive circuitry for servo motors

Witness the ultimate high-end integrated type CD player -- MDS++ type
D/A converter makes a good thing even better. Fully independent transportand processor sections and EXT DSP connectors allow use of DG-38 forsound field compensation. Optical and coaxial digital inputs and outputs
provide added flexibility. Fully digital control of CD mechanism achieves
optimization of servo parameters in real time.

CDOpticalHeadRF
Signal
Processor

Spindle Motor& Driver

SpindleServoController

Sled Motor& Driver

Focus &Tracking ServoController

EFM Decoder& ErrorCorrector

Digital Audio
Data Encoder

Clock
Generator

Display
DriverKey
MatrixInfrared
ReceiverTray Motor& DriverSM

From RemoteCommander

Digital Audio
Interface
Decoder

OpticalReceiverdB

Display

OpticalDigitalInputs
Pulse Amp

Coaxial

OpticalTransmitter

OpticalDriverCoaxial
Transmitter

CoaxialDriverCoaxialTransmitter

Outputn Laser pickup with integrated RF amplifier
Since the output level of a laser pickup is very low, it is highly
vulnerable to externally induced noise. To prevent such problems,
the pickup used in the DP-67 employs an RF amplifier which is socompact that it can be directly integrated in the pickup assembly.
This assures that the high-level output signal remains free from noiseinterference, which in turn reduces the error rate.
n Balanced drive circuitry for servo motors
The motors and actuators which drive the disc tray, spindle, sled,
and the focussing and tracking assembly require a rapidly fluctuating
drive current, which can affect other circuit areas and cause soundquality degradation.
In the DP-67, the Drive signal
Drive signal
drive current for
DriverDrivereach actuator isLoad
Load
provided by two
amplifiers arranged
in a balanced
Driverconfiguration.
Conventional circuit
Balanced drive circuit
Because there is no(current flows in ground line)(no current flows in ground line)
circuit flowing in theCD actuator drive circuit
ground line, theoperation of othercircuits in the player remains entirely unaffected.
n Tray lock prevents resonances
If the disc tray which is used to slide the disc into the unit resonates
due to vibrations generated in the rotating assembly while the discis playing, signal quality can be degraded. In the DP-67, the tray isfirmly secured during playback, to eliminate any possibility of harmfulresonances.

Disc Clamp
Motor & DriverMasterControl
Computern Fully digital control of CD mechanism
Control of the mechanism section is fully digital, allowing the use ofadaptive circuits to optimize servo performance for each individual
disc. This assures enhanced operation stability and a drastic reduction
in error rate. Long-term reliability and performance uniformity arealso improved, since fluctuations in ambient temperature can haveno adverse influence.

Load current

DIGITAL SECTION

Focus Coil&Tracking Coil

CD Transport Section Features and Functions

Load current

The DP-67 is an integrated player dedicated to Compact Disc playbackwith superb sound quality. It has inherited many technological features
originally developed for reproduction of new-generation formats suchas SACD. The DP-67 has been refined through extensive listening tests
and can also serve as a stand-alone digital processor. It lets you
discover untold riches of musical detail even in CDs with which you arethoroughly familiar.
The processor section features an ultra-precise 24-bit D/A converter
using a newly developed MDS++ converter. This takes the MDS (MultipleDelta Sigma) principle pioneered by Accuphase to new heights. It features
minimal distortion, excellent S/N ratio, superb linearity at low signallevels, and outstanding performance in all other aspects. Since the DP67 provides access to this converter via a setof two digital inputs (optical and coaxial), itssound quality and performance can be utilizedalso by external components capable ofsupplying a digital signal. The benefits of
Optical input display example
super-accurate D/A conversion will let any
digital signal sound its very best. A set of
digital outputs (optical and coaxial) is also
provided, allowing connection of a digitalrecorder for formats such as CD-R, DAT, orCoaxial input display example
MD. This lets you record either the signal fromthe internal CD transport or from an external source. In addition, theEXT DSP connectors are convenient when wishing to use the Digital
Voicing Equalizer DG-28/DG-38 for sound field compensation in thedigital domain.

DigitalOutputs

n Power-on play and frame display“Power-on play” means that the DP-67 can start playback when poweris turned on, allowing automatic playback in conjunction with an audiotimer. For precise location of any spot on a disc, the player can display
frame information (1 frame = 1/75 second), and functions such as
repeat can be carried out in steps of individual frames.
Digital Processor Section Features and Functions

EXTDSP
Pulse Amp

Input

n MDS ++ type D/A converter achieves
stunning performance and sound quality

ANALOG SECTIONMDS++
D/A Conversion
SystemUnbalanced
Output3-PoleLinear Phase
Low-pass Filter

Left
Balanced
Outputn 3-pole linear phase analog filter withoutstanding phase characteristics

×4

Balanced
BufferMDS++
D/A Conversion
SystemUnbalanced
Output3-PoleLinear Phase
Low-pass Filter

Right
Balanced
Output×4

Balanced
Buffer

DP-67 Block Diagramn Jitter-free high-performance digital
demodulator
Delta Sigma D/A convertern Digital level control with adjustment
range 0 dB to –40 dB
n Balanced and unbalanced analog outputs
Digital demodulator ICMDS++ D/A converter moves another step ahead
MDS (Multiple Delta Sigma) is a revolutionary design which employs several delta sigma type converters in aparallel configuration. In the combined output of these multiple converters, conversion errors cancel each otherout, resulting in a drastic improvement in all relevant aspects of converter performance: accuracy, S/N ratio,
dynamic range, linearity, THD, etc.
In the DP-67, four delta sigma type AD1955 converters made by Analog Devices are driven in parallel. Thisresults in an overall performance improvement by a factor of 2 (= √4).
As shown in the diagram, the MDS++ features an enhanced current-to-voltage (I/V) converter for processing
the D/A converter output current. A combination of current summing and voltage summing is used, resulting ineven better stability and top-notch performance. When listening to a CD with this system, the music emerges
from a totally silent background. Breathtaking detail resolution and a highly accurate sound stage are immediatelyapparent characteristics.
SignalDigital input

DAC#1(Normal phase output)

Conversion error

I (current)/V (voltage)
converter

S1

DAC 1

I/V

e1(Reverse phase output)

S2#2S0 (Signal)
DAC 2e2

I/V–+Sn-1e0#n-1

DAC 3I/V

Subtraction

DAC output(Conversion error)

en-1
#nSn
en

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

n MDS type D/A converter principle

DAC 4I/V

Current summingVoltage summingn MDS ++ converter block diagramn Assembly with
MDS++ D/A
converter andanalog output
circuitry etc.

n Assembly withCD transport
control circuitry anddigital input/output
circuitry etc.

n Supplied remote commander
RC-18
Offers a host offunctions such as
input switching,direct play, program
play, repeat, etc.

EXT DSP input/output allows insertion of external component(DG-28/DG-38) into playback signal path
The coaxial EXT DSP input and output connectors and ON/OFF switch make iteasy to use the Digital Voicing Equalizer DG-28 or DG-38 via a coaxial cable link.
This allows sound field compensation in the digital domain.

DG-28/DG-38 connection example

n Independent processor section. Coaxial and optical digital input
connectors accept signals withsampling frequency up to 96 kHz
and resolution up to 24 bits.
n Direct copying of digital signal
possible, thanks to coaxial andoptical digital output connectors.

Digital input
connectors

Digital output
connectors

n “High Carbon” cast iron insulator feet with superior damping
characteristics further enhance sound quality

DIGITAL IN
DIGITAL OUT

Coaxial cableDG-38

NOTEn Proper playback of CCCDs is not assured.
m Copy Control CDs (CCCDs) and other types of discs implementing someform of copyright protection may not play properly on Accuphase CD players,
because such discs may not conform to existing CD standards. No assurances
are made regarding playback and sound quality when using such discs.
m For detailed information regarding CCCDs, please contact the discm Select playback source (inserted CD orexternal component) with input selector ofDP-67.
m Set EXT DSP switch to ON to insert DG-28/
DG-38 into playback signal path of DP-67,
to provide sound field compensation for
currently playing source.

manufacturer.

✽ Factory default position of EXT DSP switch: OFF DP-67

n Front paneln Only discs conforming to existing CD standards can be playedon this player. Check the label on the disc before attempting touse it in this player.

DP-67 GUARANTEED SPECIFICATIONS[Guaranteed specifications are measured according to the EIA standard CP-2402.][Measurement disc: CP-2403]

CD Transport
m Format:

Format:Quantization:
Sampling frequency:
Error correction principle:
Number of channels:Revolution speed:Standard CD format
16 bits
44.1 kHz
CIRC
2500 - 200 rpm(constant linear velocity)
1.2 - 1.4 m/s, constant

Scan velocity:n Rear panelm Data read principle

Non-contact optical pickup (semiconductor laser)m Laser type

GaAlAs (double heterodyne diode)

Digital Processor
m Input format

0

A Play track indicator

J Track search buttons[ Processor operation: digital input indicator ]B Track/index indicator
Processor operation:
sampling frequency indicator
C Time indicator
D Output level indicator
E Disc tray open/close button
F CD transport/processor selector button
G Power switch
H Disc tray
I Play/pause button[ Processor operation: external input selector buttons ]K Stop button
L Digital input connectors (coaxial, optical)
M Digital output connectors (coaxial, optical)
N EXT DSP ON/OFF switch
O EXT DSP (external component) input/output connectors
P AC power connector0
Q Balanced output connectors (analog)
a Groundb Inverted (–)
c Non-inverted (+)
R Unbalanced output connectors (analog)

Remarks
0 This product is available in versions for 120/230 V AC. Make sure that the voltage shownon the rear panel matches the AC line voltage in your area.
0 The shape of the AC inlet and plug of the supplied power cord depends on the voltage
rating and destination country.

n Supplied accessories:

EIAJ CP-1201 compatible
Quantization:
Sampling frequency:

16 - 24 bits, linear
32 kHz, 44.1 kHz, 48 kHz,88.2 kHz, 96 kHz

m Digital input level(EIAJ CP-1201)

OPTICAL:
COAXIAL:

Input –27 to –15 dBm
0.5 Vp-p, 75 ohms

m Digital output level(EIAJ CP-1201)

OPTICAL:
COAXIAL:

Output –21 to –15 dBm
Wavelength 660 nm
0.5 Vp-p, 75 ohms

m D/A converter

MDS++ type, 24 bits

Digital deemphasis

m Frequency response

4.0 to 20,000 Hz ±0.3 dB

m Total harmonic distortionMax. 0.001% (20 - 20,000 Hz, 24-bit input)m Signal-to-noise ratio

114 dB or betterm Dynamic range

110 dB or better (24-bit input)

m Channel separation

110 dB or betterm Output voltage andimpedance

BALANCED:
2.5 V into 50 ohms, balanced XLR type
UNBALANCED: 2.5 V into 50 ohms, RCA-type phono jacks

m Output level control

0 to –40 dB in 1-dB steps (digital)

Generalm Power requirements

AC 120 V/230 V, 50/60 Hz(Voltage as indicated on rear panel)m Power consumption

17 W

m Dimensions

WidthHeightDepthm Weight

16.5 kg (36.4 lbs) net
21.0 kg (46.3 lbs) in shipping carton

475 mm (19-11/16”)
150 mm (5-7/8”)
396 mm (15-9/16”)

m Supplied Remote Commander RC-18
Remote control principle:
Power requirements:
Dimensions:
Weight:Infrared pulse
3 V DC, IEC R6 (size AA) batteries × 255 mm × 194 mm × 18 mm
100 g (including batteries)m AC power cordm Audio cable with plugs (1 m)m Remote Commander RC-18• Specifications and design subject to change without notice for improvements.

http://www.accuphase.com/G0305Y PRINTED IN JAPAN 851-0133-00 (AD1)