Accuphase DG-68 Digital Voicing Equalizer

In 1997, Accuphase introduced a product which revolutionised the concept of the graphic equaliser and made headlines in the audio world: the Digital Voicing Equalizer DG-28. Follow-up models in the DG series, culminating in this, the latest Accuphase DG-68, brought further improvements which garnered more praise and led to the recognition of the Voicing Equaliser as an indispensable component of the ultimate audio system.

The high-resolution, high-definition colour 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. Setting data as well as display screenshots can be saved on a USB flash drive for 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.

What is a “Voicing Equaliser”

The Voicing Equaliser from Accuphase brings together two major functions, namely sound field compensation for optimising the acoustic properties of the listening room, and a graphic equaliser for adjusting individual frequency bands and thereby controlling the tonal quality of the music being played. A supplied precision microphone is used to measure the acoustics of the listening room and enable the automatic creation of the sound field as desired by the user. The graphic equaliser function then enables further fine tuning and flexible tonal adjustments. As the word “Voicing” also has the meaning of “tuning”, the product was named with the idea of tuning the listening room

Features

Fully digital signal processing Voicing Equalizer

Separate sound field compensation and 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

Intuitive and highly readable menu screens make operation easy

Freely programmable 30 pattern memory

Analog and digital inputs and outputs provided as standard

Specifications

Voicing

1 / 6 octave, 67 bands, IIR filter

Adjustment range ±12 dB

Equalizer

1 / 6 octave, 80 bands, IIR filter

Adjustment range ±12 dB

Measurement signal Warble tones

Frequency response curve input methods Direct drawing with stylus pen, input with cursor keypad

Spectrum analyzer

1 / 3 octave, 35 bands, real-time analyzer

Display level +18 dB to -90 dB (6 ranges, selectable)

Frequency response 0.5 to 50,000 Hz +0 -3.0 dB

THD + Noise

Analog input — Analog output 20 to 20,000 Hz 0.0007%

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

Method 4-parallel delta-sigma modulation

Sampling frequencies 44.1 kHz, 88.2 kHz, 176.4 kHz, 352.8 kHz

Resolution 32-bit

D / A converter

Method 8 MDS+

Sampling frequencies 32 kHz to 384 kHz

Resolution 32-bit

Digital inputs / outputs

HS-LINK

Connector type RJ-45

Suitable cable Dedicated HS-LINKcable

COAXIAL

Format IEC 60958 compliant

OPTICAL

Format JEITACP-1212compliant

Sampling frequencies

HS-LINK

Ver. 1

DSD 2.8 MHz(*1) 1-bit

PCM 32 to 192 kHz 16 to 24-bit

Ver. 2

DSD 2.8 7 5.6 MHz (*1) 1-bit

PCM 32 to 384 kHz 16to 32-bit

COAXIAL

PCM  32 to 192 kHz 16 to 24-bit

OPTICAL

PCM  32 to 96 kHz 16 to 24-bit

USB port USB 2.0 / 3.0, for USB flash drive (upto 128 GB) 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") x Height 161 mm (6.34") x Depth 396 mm (15.59")

Mass

Net   14.9 kg (32.8 lbs)

In shipping carton   22 kg (49 lbs)

*1 Digital input only