DIGITAL VOICING EQUALIZER● Fully digital signal processing Voicing Equalizer ● Separate sound field compensationand equalizer functions ● Smooth Voicing feature prevents excessive correction
based on the low frequency reproduction capability of the speakers ● High-speed 40-bit
floating point DSP ● High-accuracy A / D and D / A conversion circuitry ● Intuitiveand highly readable menu screens make operation easy ● Freely programmable
30 pattern memory ● Analog and digital inputs and outputs provided as standard

Creating the ideal acoustic environment — With this fifth-generation Digital Voicing Equalizer
featuring ultra-advanced digital technology.
The high-resolution, high-definition color IPS LCD panel allows the use of a stylus pen todirectly draw any desired response curve. Intuitive operation and a full complement ofsophisticated display functions make sound field compensation swift and easy while giving theuser full control. Setting data as well as display screenshots can be saved on a USB flash drivefor quick recall at any time. The DG-68 brings out unknown possibilities in music reproduction
by controlling the sound field and tone exactly in accordance with the user's preferences.
In 1997, Accuphase introduced a product which revolutionized
the concept of the graphic equalizer and made headlines in
the audio world: the Digital Voicing Equalizer DG-28.
Follow-up models in the DG series brought further improvements which garnered more praise and led to the recognitionof the Voicing Equalizer as an indispensible component of theultimate audio system.

■ What is a "Voicing Equalizer"?
The Voicing Equalizer from Accuphase brings together twomajor functions, namely sound field compensation for optimizing the acoustic properties of the listening room, and agraphic equalizer for adjusting individual frequency bands andthereby controlling the tonal quality of the music being played.
A supplied precision microphone is used to measure theacoustics of the listening room and enable the automatic
creation of the sound field as desired by the user. The graphic
equalizer function then enables further fine tuning and flexible
tonal adjustments. As the word "Voicing" also has themeaning of "tuning", the product was named with the idea oftuning the listening room.
■ DG-68
The fifth generation DG-68 is the result of a major redesign ofthe operational aspects of the Voicing Equalizer, making it eveneasier to explore its highly sophisticated capabilities. The
dedicated DSP chip employs latest signal processing technology
to effortlessly handle the input from both analog and high-resolution digital sources. A wide complement of digital and analog
input and output connectors provides unprecedented versatility
for various connection types, and the highly advanced A / D and
D / A converters ensure dramatically improved sound quality andperformance both on the analog input and output side.

Advanced Features■ Separate sound field compensation and equalizer functions■ Further evolved automatic sound field compensation- Smooth Voicing feature prevents excessive correction based on the low frequency
reproduction capability of the speakers.
- Further improved measurement accuracy enhances the effectiveness of sound fieldcompensation■ Intuitive and highly readable menu screens for easy operation■ Freely programmable 30 pattern memory■ Setting data and display screenshots can be saved on a USB flash drivefor easy recall■ Thick aluminum top plate with exquisite hairline finish■ Elegant side panels with natural wood grain finish■ Sound field measurement microphone AM-68 included

Aluminum top plate with hairline finish■ Block Diagram

8MDS＋

×48MDS＋Sound field measurement microphone AM-68

Speaker

For testing, the DG-68 outputs four warble tonesof different frequencies simultaneously.
MicrophoneAM-68

DG-68

Supplied remote commander
RC-330TONE GENERATORFILTERENGINE

Enables remote operation ofVoicing on / off, input switching,memory save and load,
cursor movement etc.

ANALYZER

How Voicing works
The internal test signal generatorof the DG-68 produces warble
tones which are used to drive thespeakers via the power amplifier.
The sound travels through thesound field and is picked up by
the microphone for sound fieldmeasurement and compensation.

Power amplifier
Preamplifier

CD player

Smooth Voicing
Adjustment incorporating speaker and room characteristics

Smooth Voicing keeps frequency response differences between the left and right channels to an absolute minimum, creating a very smooth response curve.

Step 1

Step 2

Set measurement signal level

Step 3

Select memory number for saving settings

Step 4

Start automatic measurement and compensation

Compensation completed

Smooth voicing measurement results
After compensation

Before compensation
Left channel

Right channel

Left channel

Right channel

Technology development ahead of the curve■ 40-bit floating-point DSP chip ADSP-21489 from Analog Devices realizes

super-accurate fully digital signal processing■ 32-bit A / D converter chip AK5578EN from Asahi Kasei Microdevices used ina fourfold parallel configuration in each channel for optimum performance■ 32-bit D / A converter chip ES9028PRO from ESS Technology used inan eight-fold parallel configuration in each channelfor optimum performance■ ANCC (Accuphase Noise and Distortion

Cancelling Circuit) technology in A / D andD / A converter circuitry minimizes noise anddistortion■ BALANCED and LINE level analog inputs andoutputs plus three types of digital inputs andoutputs (HS-LINK Ver. 2 / COAXIAL / OPTICAL)

DG-68 Triple Functionality: VOICING / EQUALIZER / ANALYZER
The DG-68 incorporates three complementary functions.
The desired function can be selected easily with one of
the four large buttons on the HOME screen (there aretwo choices for Voicing).
The various buttons and graph displays that are shownfor each function can be directly manipulated with thesupplied stylus pen. For fine-tuning adjustments, the up /down / left / right cursor buttons at the right side of thefront panel will also come in handy during input.

Other functions and features■ Full control over system

environment settings

HOME screen- Enable / disable Voicing and Equalizer
functions- Adjust analog input sampling frequency andgain settings- Adjust output level automatically or manually- Adjust left / right balance- Select HS-LINK output version- Turn subsonic filter on or off- Adjust display brightness or turn display off

Sound field compensation: VOICINGThe Voicing function involves measuring the acoustic
characteristics of the room using a microphone and thenproviding compensation to achieve ideal music reproduction
conditions.
The user can choose between two adjustment methods forVoicing. With AUTO VOICING, the entire process isperformed automatically for superior operation convenience.
MANUAL VOICING gives the user full control over each
item, enabling manual adjustment while checking the results.

Equalizing function: EQUALIZERThe Equalizer allows adjusting the tonal result byselectively boosting or attenuating the level of the musicsignal in specific frequency bands.
The DG-68 offers an amazing 80 bands covering thefrequency range up to 100 kHz. By controlling the levelin these bands, any desired frequency response can becreated.
While listening to actual music, use the stylus pen todraw a response curve. Being able to make adjustments
visually while checking the audible result makes all thedifference.

VOICING measurement result screen

EQUALIZER screen■ Memory functions
The unit provides 30 memory slots forsaving Voicing and Equalizer results andsettings. Each memory slot is assigned an
editable name, and memory data can bebacked up onto a USB flash drive. Deleting
data that are no longer required is also
possible.

■ Large, easy-to-read text

display improves usability

The buttons and alphanumeric information
are shown in a large, easy-to-read format
that improves usability. This is illustrated
here by the sample screens for MEMORY
operation and the keyboard.

Spectrum analyzer function: ANALYZER
A spectrum analyzer makes it possible to display theactual frequency components of the music being played.
The DG-68 divides the frequency spectrum into
35 bands, reaching up to 50 kHz. The level of each bandis analyzed and shown on screen.
When using the Equalizer, the Analyzer lets the user firstcheck the spectral frequency distribution of the music, todetermine where adjustments will be most effective.
ANALYZER screen

Connection Examples
Integrating the DG-68 into your existing audio system will enable you to create the ideal environment for enjoying music as
deeply as never before. Because the DG-68 is equipped with balanced and line (unbalanced) analog inputs / outputs as wellas with digital inputs / outputs including HS-LINK, it can be connected to all types of other equipment, either digital or analog.
Analog connection examples

Digital signal connection examples■ Connection of DG-68 between preamplifier and power amplifier■ Direct digital connection of SA-CD / CD player and DG-68

This is an example for a conventional analog connection, inserting theDG-68 between the preamplifier and power amplifier. The connection
can be made either with balanced or line (unbalanced) cables.

The transport section output of an SA-CD / CD player can beused to directly process the signal in the digital domain forsound field compensation.

SA-CD player,tuner or similar

DG-68

Preamplifier

From analog outputs

To ANALOG INPUTS(Line inputs can also be used)

DIGITAL INPUTSDIGITAL OUTPUTS

HS-LINK cable
DG-68

TRANSPORTOUTPUTS

From ANALOG OUTPUTS(Line outputs can also be used)

DIGITAL INPUTSPower amplifier■ Connection of DG-68 in RECORDER loop of

From analog output(Balanced connection
also possible)

SA-CD / CD player

preamplifier or integrated amplifierThis is an example for inserting the DG-68 in the RECORDER
loop (using the PLAY / REC connectors) of a preamplifier or
integrated amplifier.
Power amplifier

Preamplifier orintegrated amplifier

SA-CD player,
tuner or similar

From analog outputs

From REC

Preamplifier(Not required when using
an integrated amplifier)

To PLAY

RECORDER connectors

Connection example for use of DG-68in a multi-amped system with a channel divider
In this example of a 2-way multi-amped system, the analog preamplifier
output is sent to the DG-68 for sound field compensation and then supplied(from the DIGITAL OUTPUTS) in digital form to the channel divider.
SA-CD player,tuner or similar

To ANALOG INPUTS

From ANALOG OUTPUTS

Analog preamplifier

From analog outputs

To ANALOG INPUTS(Line inputs can also be used)

DG-68

DG-68

■ Connection of DG-68 between preamplifier section

and power amplifier section of integrated amplifierThis is an example for connecting the DG-68 to an integrated amplifierthat allows separation of the preamplifier and power amplifier sections.
SA-CD player,
tuner or similar

From DIGITALOUTPUTS

Integrated amplifier

Channeldivider

From analog outputs

FromPRE OUT

HS-LINK cableTo
MAIN IN

From analog
outputs (LOW)
To ANALOGINPUTS

From analog
outputs (HIGH)From
ANALOG OUTPUTS

DG-68

Low-range
power amplifier

High-range
power amplifierAbout HS-LINK Ver. 2
HS-LINK Version 2 is a further enhanced
version of the Accuphase HS-LINK
interface, providing expanded sampling
frequency and quantization support.

FormatInput(2-channel)

HS-LINK
Ver. 1DSD

2.8 MHz

Number ofbits
1PCM

32 / 44.1 / 48 / 88.2 / 96 / 176.4 / 192 kHz

16 to 24DSD

2.8 MHz / 5.6 MHz

PCM

32 / 44.1 / 48 / 88.2 / 96 / 176.4 / 192 / 352.8 / 384 kHz

HS-LINK
Ver. 2● The DG-68 supports both HS-LINK Ver. 1 andHS-LINK Ver. 2 signal transmission.

Sampling frequencies

1HS-LINK
Encoder

Digital
Audio
SignalSecurity
Control

HS-LINK
Decoder

TIA/EIA-644 LVDS
Driver/Receiver

HS-LINK
cable

RJ-45Connector

RJ-45Connector
TIA/EIA-644 LVDSDriver/ReceiverMasterClockDigital
AudioSignal

16 to 32

＊HS-LINK cable can be used bothfor HS-LINK Ver. 1 and HS-LINK
Ver. 2 signal transmission.
＊With HS-LINK Ver.2, the data andclock signal are transmitted separately, and high sampling frequencies up
to 5.6 MHz 1-bit DSD and 384 kHz
32-bit PCM are supported.

SecurityControlMasterClock＊HS-LINK is a registered trademarkof Accuphase Laboratory, Inc.

HS-LINK Ver. 2 Signal Transmission Block Diagram

Front Panel
Remotesensor

VC / EQ button
Voicing / Equalizer
ON: LED lit
OFF: LED outDisplayPower switch

Microphoneinput jack

Rear Panel
Cursor /Enter buttons

Stylus pen holder(for supplied stylus pen)

HOME
buttonMemorybutton

Input selector
buttonGuaranteed Specifications
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USB port

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Analog outputs
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AC power
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＊'LJLWDOLQSXWRQO\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 plug of the supplied AC power cord depends on the voltage rating and destination country.

Supplied accessories● Stylus pen● Microphone cable (5 m)● Audio cable with plugs ASL-10B● Remote Commander RC-330●● Microphone AM-68● Microphone holder● AC power cord
● Cleaning cloth

The specifications and appearance of this product are subject to change without notice.
F2004Y PRINTED IN JAPAN 850-2219-00（B1）