● Fully digital signal processing Voicing Equalizer ● High-speed 40-bit floating point
DSP ● Separate digital filters for Voicing and Equalizer sections ● Wide-format color
LCD panel allows direct drawing of response curve with stylus pen ● Freely
programmable 30 pattern memory ● Real-time spectrum analyzer for display of musicsignal and microphone input ● Analog and digital inputs/outputs provided as standard

Effortlessly create your ideal listening environment — With this fourth-generation Digital
Voicing Equalizer featuring leading-edge digital technology. High-definition,
high-resolution IPS LCD panel allows the use of a stylus pen to directly draw any desired
response curve. Intuitive operation and a full complement of sophisticated display
functions make sound field compensation swift and easy while giving the user full control.
A range of analog and digital inputs and outputs are provided as standard, and a USB
port allows saving and loading data as well as saving screenshots of the display content.
In 1997, Accuphase introduced a product which
revolutionized the concept of the graphic equalizer andmade headlines in the audio world: the Digital Voicing
Equalizer DG-28. Its superb functionality and amazing
effectiveness garnered high praise among audiophiles
both in Japan and overseas. This was followed by the
DG-38 and DG-48, featuring further improvements in theautomatic sound field measurement and compensation
process. It was thanks to these products that many
audiophiles came to realize the importance of propercompensation for the acoustic properties of the listening
environment.
The DG-58 Digital Voicing Equalizer now raises the bar
again. It is a 4th generation product that reflects the stateof the art of advanced signal processing technology
developed by Accuphase. It employs the latest
high-speed DSP (Digital Signal Processor) chips, making
it possible to fully handle all sources including SA-CD in
the digital domain. Ease of operation has also beenenhanced, with two “Simple Voicing” courses forautomatic measurement and compensation, as well as a
“Custom Voicing” course that gives users the power torealize a specific acoustic concept through extensive
control over all aspects. A wide array of digital inputs andoutputs including HS-LINK, along with analog options,provides connectivity to any kind of component. The
incorporation of latest high-quality A/D and D/Aconverters ensures that analog signals also can develop
their full potential in terms of performance and soundquality. Most operations are controlled using the large,
high-definition wide-format color LCD panel. This makesusing the supplied stylus pen a pure joy, enabling theuser to create any desired response simply by drawing
on the screen. In addition, there is an “EQ+ANA” button
that functions as a Home button and allows operating theequalizer and analyzer together when observing thefrequency spectrum of a music signal for example from a
CD player or the signal from the microphone input in realtime.
The DG-58 takes the concept of intelligent equalization to
the next level, while at the same time remaining simple
and intuitive to operate, thanks to its clean anduncluttered graphical interface. The champagne goldcolored panel made from massive extruded and anodized
aluminum, and the side panels of real wood with naturalgrain finish lend a beautiful, elegant appearance to thisstunning and revolutionary product.

What is a “Voicing Equalizer”?
The DG-58, while being a full-fledgedhigh-precision graphic equalizer in its own
right, also incorporates a sophisticated system
for automatic sound field compensation thatclearly sets it apart from conventional
products.
Regular graphic equalizers do not have thecapability to make measurements, and thelevel setting for each frequency point must be
adjusted manually by the user. By contrast, theDG-58 can automatically express (voice) the
kind of response desired by the user. It is arevolutionary product that acts as an extensionof the user, harnessing sophisticatedmeasurement and compensation functions toachieve exactly the acoustic characteristics inthe listening room environment according to
the user's preferences. The somewhat unusual
term “Voicing Equalizer” was chosen to
symbolize these advanced capabilities. It
encompasses the essence of audio, offering
active control that leads into a new dimensionof musical enjoyment. Get ready to experiencea whole new world of sound.

DG-58 Features■ Voicing Equalizer with 40-bit floating point DSP and highperformance CPU/FPGA for fully digital signal processing.
■ Two equalizing modules for Sound Field Compensation(VOICING) and Sound Field Creation (EQUALIZER).
■ Large, wide-format 7-inch high-definition IPS LCD panel with fastrefresh rate and excellent color reproduction characteristics.
■ Glass touch panel and supplied stylus pen.
● Allows direct drawing of response curve on screen.
〔 Example of target curve display 〕● Cursor keypad can be used for pinpoint operation.
● Functions can be controlled by tapping or dragging
symbols displayed on screen.
■ Sound field measurement microphone AM-48 included.
■ USB port allows saving and loading of setting dataand saving screenshots on USB flash memory.
USB port(USB port cannot be used for connection to acomputer.)■ 30 memory slots to store entire patterns
including target curve, pre/post-compensation Hold down Home Current screen display is saved as
curve, equalizer curve etc. Patterns can bebutton forscreenshot image on USB flash memory.
2 seconds
given a name and called up or modified at any
Example for analyzer screen display.
Screenshot images saved on USB cantime.
be viewed on a computer. Viewing on
DG-58 is not supported.
■ Full complement of analog inputs and outputs(Balanced/Line) and digital inputs and outputs (HS-LINK/
Coaxial/ Optical).
■ D/A converter with eight high-performance 32-bit Hyperstream™ DAC chips(ES9018 from ESS Technology Inc.) driven in parallel for improved performance.
■ Elegant side panels of real wood with natural
10
grain finish
HS-LINK
Encoder
HS-LINK

DSP

HS-LINK
Decoder(Filter Engine)

CoaxialReceiverMeasurement

DAI
Encoder

HS-LINK

DigitalInputsMDS＋＋
D/A
Conversion
System

DAI
Decoder

Equalizer∆

Line
Balanced

Analyzer

A /DConverter

AnalogInputsMDS＋＋
D/A
Conversion
System

Line

Right

∆

Balanced

Microphone
Input

A /D
Converter

RemoteCommander

Infrared
Receiver

30

100

300

1k

Line

Left

Balanced

Low-Pass
FilterAnalogOutputs

Low-Pass
FilterLine

Low-Pass
FilterRight

Balanced

32-bit Hyperstream™ DAC chips

Low-Pass
Filter

System Controller
Display

USB-A

Stylus Pen(

Master Controller
Windows
Embedded Compact 7)

Display
Controller■ DG-58 Block Diagram

10k

Frequency Response of Supplied AM-48 Microphone

Low-Pass
Filter
Low-Pass
Filter3k

FREQUENCY〔Hz〕

OpticalSignal Generator

OpticalReceiver

­ 10

­ 20
10

OpticalTransmitter

FilterOpticalDigitalOutputs0

Coaxial

Voicing

CoaxialLeft

CoaxialTransmitter

RESPONSE〔dB〕＋

High-speed logic device for
DSD → PCM conversion

30

■Supplied RemoteCommander RC-310
Controls memory saveand recall, input
switching, channel
switching, VC/EQ
selection, cursor
activation and more.

Main Functions and Screens
Equalizer/Analyzer

Voicing / Custom Voicing
SETTING・Detailed voicing settings
Automatic compensation
Check microphone level
Manual compensation

REFERENCE

・Detailed target curve setting
Call up internal curve
Call up room characteristics

Compensation(measurement)
start

RESULTEQUALIZER（SINGLE BAND MODE）

・Compensation result display
Left channel
Display channel
Right channel

・ Freely adjust equalizer settings while
listening to music
Reset curve to flat
Equalizer curve

Compensation
completed in
90 seconds
Measurement volume
Compensation level setting
Channel selection

Zoom (Enlarge)
Draw or modify curve as desired

Show characteristics also after compensation

After compensation
Before compensation

Left/rightcompensationdifference

Simple Voicing
WIDE
BAND
MODE

FLAT

・Adjust to flat response
Use UP/DOWN to bring bar graphwithin index frame

SINGLE
BAND
MODE
Compensation
completed in
90 seconds

0k

SMOOTH

Adjust microphone level with UP/DOWN

CONFIGURATION

・Detailed environment settings
matched to intended use
Combination of Voicing Analog input
and Equalizer
gain setting

Left/right balance
Output level Output level
Automatic setting for manual operation fine-tuning
Manual setting
Analog input A/D converter
sampling frequency setting

EQ/WIDE BAND MODE

・Function to assist with equalizer curve input
Reset curve to flat
Equalizer curve

Cursor indicationin Wide Band
Center Modefrequency
Smoothly adjust
19 bands together

Adjustment width〔 HOME screen 〕

Adjust microphone level with UP/DOWN
・Adjustment incorporating speaker androom characteristics
Use UP/DOWN to bring bar graphwithin index frame

Zoom

Display channel

Frequency at cursor position Level at cursor position

ANALYZER
・ Display frequency spectrum inreal time

Zoom
Display channel
Frequency at cursor
Levelatcursorposition
center position

EQ＋ANA・Display equalizer and analyzer together
Equalizer curve

VolumeSwitch between input
source and microphone Toggle display
response speed
input
Toggle display level range

Analyzer
Reset curve to flat

Zoom

Further Evolved Measurement and Compensation Functions: VOICING
Using its built-in high-precision measurement facilities, the DG-58 accurately measures the sound field and determines adequate compensation to achieve the target response specified
by the user. There is a choice of two operation modes: Simple Voicing for easy operation and Custom Voicing for comprehensive control over all aspects.

SIMPLE VOICING
Speaker

For testing, the DG-58 outputs four warble tones of different frequencies
simultaneously. These are heard as a combined sound during measurement.

Microphone AM-48

FLAT
Adjust for flat response

SMOOTH〔 HOME screen 〕

Start Simple Voicing

Adjust while incorporating
speaker and roomcharacteristics
FILTERENGINETONE
GEN.

ANALYZERPower amplifier

Use UP / DOWN to selectmemory number for saving

DG-58

Analog connection example

CD player

Preamplifier

The internal test signal generator of the DG-58 produces warble tones which are used todrive the speakers via the power amplifier. The sound travels through the sound field and ispicked up by the microphone for sound field measurement.

Set level of tone generator

Start automatic measurement
and compensation＊ Sweep left and right channels twice,with four simultaneous warble tones■ Supplied microphone AM-48
A dedicated sound field measurement
microphone with controlled frequency
response is supplied with the DG-58. The
microphone is a 1/4-inch type back-electretcondenser type with an ultra-thin andextremely small diaphragm, assuring linear
response over a wide frequency range.

Compensation completed(About 90 seconds after
starting measurement)＊ Compensation data are stored automatically in the selected memory after completion.
The response curve before/after compensation can be checked on the RESULT screen.

Example 1

Compensation based on internal
standard reference curves■ Setup screen for compensation modeand microphone parameters
The Voicing compensation mode
(Auto/Manual) and compensation leveland microphone level (measurementtone) are selected from this screen.

CUSTOM VOICING
Compensation with automatically
Example 2 created target curve(Creating a curve that incorporates speaker
and room characteristics)

2 kHz
­3 dB

Example 3 Compensation with freely

created curve

R

2 kHz
­2 dB

L
First, automatic measurement of characteristics before compensation is carried out.

Using the stylus pen, any desired target curve canbe created freely.

● Speaker and room characteristics(Separate measurement for L, R or simultaneous L/R measurement is possible)

2 kHz
­1 dB

● Individual speaker characteristics

Auto generation using raw characteristics as target

L ＋ R（ averaged curve

Auto generation of

）

Flat

R
The DG-58 comes with four preprogrammed reference
curves: three curves with a high-end rolloff above 2 kHz(-1 dB, -2 dB, -3 dB per octave) and flat response.
Example for compensation when
flat response was selected

L
Based on the measured characteristics before compensation, atarget curve is created automatically. The curve can be further
modified on screen (for example to reduce extreme peaks and dips),
creating a smooth result.

Auto compensation is performed based on thedrawn target curve.

R
R
L
Compensation characteristics example for adjustmentusing the “Flat” target curve.
Peaks and dips caused by listening room acoustics
and speaker characteristics are evened out, resulting
in approximately flat response.

L

Auto compensation is performed based on
the created target curve. By comparing
the characteristics before and after
compensation, the difference can beeasily checked visually as well as aurally.

DG-58 Connection Examples
The DG-58 is a Voicing Equalizer with many functions, and therefore quite different from a conventional graphic
equalizer. By incorporating it into an existing audio system, the entire reproduction chain including the speakers
and the listening room can be measured and optimized to achieve the best possible playback quality.
Because the DG-58 is equipped with balanced and line (unbalanced) analog inputs/outputs as well as 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 connection examples＊ For analog connection to other components, use shielded audio cables.

＊ The DP-510 or DP-410 and the DG-58 can be connected directly via a digital link (Coaxial, Optical).

Connection between preamplifier and power amplifier

Direct digital connection of DP-720 and DG-58

This is an example for a conventional analog connection, inserting the
DG-58 between preamplifier and power amplifier.
The connection can be made with balanced or line (unbalanced) cables.

The EXT DSP connectors of the DP-720 can beused to directly process the signal in the digitaldomain for sound field compensation.
If the connection is made with HS-LINK cable,both the SA-CD and CD signals can be processed.
If the connection is made with coaxial or opticalfiber cable, only the CD signal can be processed.

DG-58

For balanced connection as in this example, select“BALANCED” with “INPUT” button of DG-58.

SA-CD player,
tuner or similar

From analog outputs

Select “HS-LINK” with “INPUT” button of
DG-58.

DIGITAL INPUTS DIGITAL OUTPUTS
From ANALOG OUTPUTS(Line outputs canalso be used)

To ANALOG INPUTS(Line inputs canalso be used)

Preamplifier[Balanced connection example] DG-58

HS-LINK cable
EXT DSP OUTPUTSEXT DSP INPUTSPower amplifier

From analog outputs(Balanced connection
also possible)

Connection in external component loop of preamplifier or integrated amplifier

Audio cableDP-720This is example for inserting the DG-58 in the RECORDER loop (using the
PLAY/REC connectors) of a preamplifier or integrated amplifier.

In this example, select “HS-LINK”
with the “EXT DSP” selector buttonof the DP-720.

Power amplifier
SA-CD player,
tuner or similar(Not required when using
integrated amplifier)Preamplifier or
integrated amplifier

From analog outputs

From REC

Preampliﬁer＊ The DP-900, DC-901, DP-600, and DP-550 can also beconnected directly via digital HS-LINK to the DG-58.

To PLAY

Connection example for multi-amped system with DG-58 and DF-55

RECORDER connectors＊ Set RECORDER selector of
preamplifier or integrated
amplifier to “REC ON” and“PLAY”.

SA-CD player,
tuner or similar＊ Select “LINE” with “INPUT”
button of DG-58.

Audio
cable

From analog outputs
To ANALOGINPUTS

Balanced
cable

From ANALOG
OUTPUTSIn this example of a 2-way
multi-amped system, the output of
the analog preamplifier is sent to the
DG-58 for sound field compensationand then supplied (from the
DIGITAL OUTPUTS) in digital form
to the DF-55.

Analog preamplifier

Audio
cable

(Use either)
To ANALOG INPUTS

DG-58

Select “LINE” or“BALANCED” with“INPUT” button of DG-58.

Connection to integrated amplifier with separately accessible preamplifier and power amplifier sections＊ With E-600, balanced connection is also possible.
This is an example for connecting the DG-58 to an integrated amplifierthat allows separation of pre/power amplifier sections.
SA-CD player,
tuner or similar

DG-58
From DIGITALOUTPUTS

Integrated amplifier

HS-LINK cable
From
PRE OUT

From analog outputs

Coaxialdigital cable

Optical fiber cableTo
POWER IN

For digital output:
DG-58 analog input sampling frequency setting
HS-LINK: 176.4 kHz
COAXIAL: 176.4 kHz, 88.2 kHz, 44.1 kHz
OPTICAL: 88.2 kHz or 44.1 kHz

From analog outputs (HIGH)

Set input selectorof DF-55 to type ofcable in use.

Set “EXT PRE” button to ON

and power（ Preamplifier）
amplifier separated)

Audio cable

High-range power amplifier

From analog outputs (LOW)

To ANALOGINPUTS

Audio cable

DF-55

From ANALOG
OUTPUTS

Low-range power amplifier

HS-LINK cable

DG-58＊ Select “LINE” with “INPUT” button of
DG-58.
＊ Set analog input gain to -6 dB.

For 5-way and higher
To HS-LINK connector of DIGITALINPUTS on second DF-55

Accuphase original digital interface HS-LINK: High Speed LINK

Other Features

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

Digital
Audio
SignalHS-LINK
Encoder
RJ-45
Connector
Security
Control

TIA/EIA-644
LVDS
Driver/Receiver

HS-LINK
cable

HS-LINK
Decoder
RJ-45
Connector

Digital
Audio
Signal■ ZOOM function

Pressing the ZOOM button allows the user to zoom thehorizontal (frequency) axis by a factor of two for easierviewing. This function is available on the equalizer screen,target curve drawing
screen, and manualcompensation screen
among others. Zooming
allows drawing theintended frequency
curve with further
enhanced precision.

ZOOM：ON
TIA/EIA-644
LVDS
Driver/Receiver

HS-LINK Signal Transmission Block Diagram

Security
Control

■ After Voicing, results can be checked on screen and by ear

The unit can display the response curve before and after
compensation separately for each channel. It is also possible
to compare the actual sound while playing music, by switching
Voicing/Equalizer on and off.

Assembly with high-performance 40-bit
floating point DSP as well as CPU,
FPGA, and other core component
chips. HS-LINK, coaxial, and opticalconnectors are also provided on theboard as standard equipment.

■ Editing a sound field compensation curve

After checking the sound and the curve display, the user canreturn to the Voicing screen and make further adjustments at will.

■ Manual compensation

If automatic compensation
leaves slight irregularities in
the response curve, manualcompensation in specificbands may bring the result
even closer to flat response.

■ Draw an equalizer curve
based on Voicing results Use of the ZOOM function as shown

here also facilitates level adjustments.

After Voicing, the user can
go to the Equalizer screen and further modify the curve.

■ Individual speaker measurement

This function is helpful for example to achieve properlevel matching for the different frequency bands in a
multi-amped system.

Assembly withhigh-performance,high-accuracy 4fs/24-bit A/Dconverter and MDS++ D/A converter
using eight chips driven in parallel,
Direct Balanced Filter, and other analog
circuitry. Balanced and line inputs and outputs(1 set each) are also provided on the board as
standard equipment.

■ Equalizer with Wide Band ModeIn this mode, the cursor is expanded, allowing linked
adjustment of 19 bands
together for smooth
curve creation.
Simply moving one pointwith the pen shapes theentire cursor range into asmooth curve.

DG-58 Guaranteed Specifications[Guaranteed speciﬁcations measured according to JEITA standard CP-2150]■ Front panelqw● Voicing

1/6 octave 67-band IIR filter
Adjustment range: ±12 dB● Equalizer

1/6 octave 80-band IIR filter
Adjustment range: ±12 dB● Measurement signal

Warble tones● Frequency response curve input principle
Direct drawing with stylus pen and input with cursor keypad● Spectrum analyzer

1/3 octave, 35-band real-time type
Display level: +18 dBFS to -90 dBFS (5 ranges, switchable)● Reproduction frequency 0.5 - 50,000Hz +0 -3.0 dB(Sampling frequency: 2.8224 MHz or 192 kHz)
4.0 - 20,000Hz +0 -0.3 dBe■ Rear panel
!0

r

ty

Supplied stylus pen
is housed here

!1

!2

● THD + Noise(from analog inputs to analog outputs, 20 - 20,000 Hz)
0.001％● Gain+12 to - 90 dB, variable● Analog input
maximum level

GAIN ＋6 dB: 0.89 V
GAIN 0 dB: 1.78 V
GAIN - 6 dB: 3.55 V● A/D converter

Advanced multi-bit delta-sigma modulation
Principle:
Sampling frequency: 44.1 kHz, 88.2 kHz, 176.4 kHz
Resolution:
24 bits● D/A converter

Principle:
8 MDS++
Sampling frequency: 32 kHz - 192 kHz
Resolution:
32 bits● Digital inputs

HS-LINK

uio!3

COAXIALOPTICAL

Connector type: RJ-45
Suitable cable: Dedicated HS-LINK cable
Format:IEC 60958 compliant
Format:JEITA CP-1212 compliant● Sampling frequency!4
q Display
w Cursor/Enter buttons
e Power switch
r Microphone input jackt Voicing/Equalizer ON/OFF
buttony Memory button
u Home button
i Input selector buttono Channel selector button!0 Digital inputs
HS-LINK / COAXIAL / OPTICAL!5!6

32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz,
176.4 kHz, 192 kHz (16 to 24-bit 2-channel PCM)
(OPTICAL to 96 kHz)
[Only via HS-LINK] 2.8224 MHz (1-bit 2-channel DSD)★

!1 Digital outputs
HS-LINK / COAXIAL / OPTICAL!2 Analog inputs
BALANCED / LINE
!3 Analog outputs
BALANCED / LINE
!4 USB port for flash memory(USB stick)!5 BALANCED OUTPUTS phaseselector!6 AC power connector ★

● Digital outputs

HS-LINK
COAXIALOPTICAL

Connector type: RJ-45
Suitable cable: Dedicated HS-LINK cable
Format:IEC 60958 compliant
Format:JEITA CP-1212 compliant● USB port

USB 2.0/3.0 (up to 128 GB), for flash memory● Operating system

Microsoft® Embedded Compact 7®

(Cannot be used for connection to a computer)● Power requirements

120 V, 220 V, 230 V AC (voltage as indicated on rear panel), 50/60 Hz● Power consumption

24 W● Maximum dimensions Width 465 mm (18.31")
Height 161 mm (6.34")
Depth 396 mm (15.59")● Mass
14.3 kg (31.5 lbs) net
22.0 kg (44.1 lbs) in shipping carton＊ Microsoft and Embedded Compact 7 are registered trademarks of Microsoft Corporationin the U.S. and in other countries.

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.

●

Supplied accessories● Stylus pen● Microphone AM-48● Microphone cable (5 m)● Microphone holder● Audio cable with plugs (1 m)● AC power cord

● Remote Commander RC-310● Cleaning cloth

Specifications and design subject to change without notice for improvements.

http://www.accuphase.com

A1405Y PRINTED IN JAPAN

850-2184-00（B1）