Since launching the revolutionary DG-28 in 1997, the DG series,
which combines sound field correction (VOICING) and soundfield creation (EQUALIZING) functions, has been pursuing theease of use and high electrical performance.
DG-68 is a successor of DG-58, released in 2013, adopting thelatest devices and further improving AD-DA conversion accuracy.
In VOICING mode, the DG-68 measures room acoustics
accurately and eliminates extreme dips and peaks such as
standing waves. This improves the localization of vocals and theexpansion of sound stage dramatically. In addition to automatic
adjustment of target characteristics, it is also possible to draw
desired target curve in the manual mode or to correct room
acoustics according to the customer’s own loud speakers.
By performing VOICING and EQUALIZING, it is possible toachieve the ultimate ideal sound.

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DG-68 obtains the intuitive and highly readable menu
screen which allows audiophiles to have stress-freeaccess to all functions.

2The DG-68 incorporates 3 complementary functions andthe desired function can be selected easily on the HOMEscreen.
The Voicing function involves measuring the acoustic
characteristics of the room and provides thecompensation to achieve ideal reproductive conditions
automatically or manually.
The Equalizer allows adjusting the tonal result by
boosting or attenuating the level of signal in specificfrequency bands. Any desired frequency response canbe created.
The Spectrum analyzer makes it possible to display theactual frequency components of the music being playedby the real-time analysis.

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Accuphase further evolves the automatic sound fieldcompensation.
Smooth voicing keeps frequency response differencesbetween left and right channel to minimum, and createsa very smooth response curve. This helps to eliminate
the standing wave and emphasize the sound localizationof the music source.
The smooth voicing feature prevents excessive
correction based on the speaker’s low frequency
reproduction capability, further improves measurement
accuracy and enhances the effectiveness of sound fieldcompensation.
As a result, the DG-68 realizes the excellent bass
reproduction.

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DG-68 has the digital signal processing modules on theright side, and the mixed-signal processors including A/D,D/A converter on the left.
The DSP chip from Analog Devices realizes high-speed
filtering process without the down-sampling up to 384kHz
signals.
The latest A/D, D/A converter chips show the optimum
performance that outputs the signal through superaccurate fully digital signal processing.

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A/D converter circuit which converts the analog input
signal from pre-amp to digital is one of the mostimportant module.
In the DG-68, the premium 32-bit AK5578EN from AKM
used in 4 parallel configuration. The residual noise atanalog input is 15% improved.

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The D/A converter which is the exit of music signal isalso required the high-performance.
Not only 32-bit Hyper stream II DAC from ESS used in 8
parallel configuration, but also Accuphase-unique ANCC
technology is installed.
THD+N, which is the important performance index of D/Aconverter has achieved the significant improvement over40%.

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ANCC is the latest Accuphase’s unique technology.
To reduce noise from DACs, filter amp needs wide
dynamic range and linearity.
High voltage power supply and complicated architecture
are required to obtain expected performance.
ANCC needs only general main amplifier and small low
noise OP-AMP as the sub-amplifier.
Feedback loop cancels the distortion of main amp, andfeedforward loop negates the detected distortion, andthis also shows the same effects on noise.
This new technology contributes to make accurate D/Aconversion with a simple circuit.

8The DG-68 is equipped with balance and line analog
inputs / outputs as well as with digital inputs / outputs
including HS-LINK (corresponding to Ver.2), Coaxial andOptical, it provides all kinds of connections.
With a USB flash drive, the unit provides 30 memoryslots for saving Voicing and Equalizer results andsettings.

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HS-LINK Version 2 extends the HS-LINK standard.

For backward compatibility, DG-68 is still available HSLINK Ver.1 output.

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The biggest feature of HS-LINK Ver.2 is sending musicsignal and master clock separately to D/A converter in areceiver.
HS-LINK Ver.1 transfers the music signal merging themaster clock together, PLL circuit for master clock
recovery is needed at receiver side.
Since master clock is being transmitted as it is, in HSLINK Ver.2, not only master clock recovery is
unnecessary at receiver side but also it comes to be freefrom the jitter at PLL circuit.

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Thick aluminum top plate with exquisite hairline finish
and side panel with natural wood grain finish arereflected in elegance and sophistication.
The dedicated remote commander and sound fieldmeasurement microphone are included.

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