Audio Database
DX71mkII
Commentary

D/A converter equipped with 24 bit DAC and preamplifier function.

The D/A converter newly adopts NPC's SM5865CM which supports 24bit/192kHz.
To realize ultrahigh-speed digital transmission, a 0.3 nsec memory device is used for the input of the DAC circuit.

Equipped with a single-end pure class A preamp, the DX71mkII can drive the power amplifier directly. In addition, the volume control has four 100-step potentiometers, and the resistance value is digitally controlled to achieve high sound quality and smooth volume control.
It is also equipped with a digital phase inverter (phase switching) to facilitate connection with overseas amplifiers.

The the power supply section, the digital and analog sections are completely independent, and the left and right analog sections are also separated.
In addition to installing a 130,000 μ F large-capacity capacitor, we have adopted a newly developed "Time Constant" amplifier that is independent of the speed of the transformer or capacitor to increase the power supply speed and reduce the noise level.
This "time-constant" amplifier is independently mounted in each stage of digital and analog. Its capacity is ultra-low ESR without frequency fluctuation, and its theoretical value is more than 1,000,000 μ F.

The digital input includes coaxial, optical, AES/EBU, and CEC's own superlink.
With CEC Superlink, audio and clock data are separately transmitted without passing through SPDIF encoding, making it possible to minimize degradation in sound quality.

In conventional FIR digital filters, vibrations called ringing occur just before and just after the peak due to the energy generated at the peak pulse. However, the DX71mkII uses a high-speed digital filter to eliminate ringing and improve distortion of sound quality.

The signal has been successfully balanced on a digital stage and the well-designed parallel balanced circuit contains four 24-bit DACs.
This reduces the distortion factor by half and doubles the signal processing speed.

Model Rating
Type D/A converter
Digital input Coaxial, Optical, AES/EBU (XLR)
CEC Super Link (D-sub 9 pin)
Audio Out Balanced (XLR) : 2 systems
Unbalanced (RCA) : 2 lines
DAC NPC Corporation SM5865CM, 24 bit
Pwer 100 V, 50Hz/60Hz
Power consumption 6W
External dimensions Width 435x Height 105x Depth 310 mm
Weight 10kg
Attachment CEC superlink cable
Remote control
Power cable