Audio Database
DX51mkIII
Commentary

D/A converter with quantization distortion reduction technology.

The D/A converter uses SM5865CM which is a 24 bit D/A converter made by NPC.
In addition to enabling jitter-free ultrahigh-speed digital transmission, this DAC employs a linear flat filter to eliminate the ringing distortion that occurs with a pulsed waveform.
In addition, the IV converter is a passive type, and the analog section is a fully balanced non-feedback circuit to realize single-end pure class A operation.

Equipped with a high-speed digital filter that does not generate any ringing that occurs with conventional FIR digital filters, so even if the waveform is pulsative, it is not disturbed in the time domain and provides natural sound quality.

Equipped with a newly designed I/V converter amplifier.
Conventional op-amps always have an NFB delay, and because the level is unstable, the input stage is overloaded by the speed of the DAC output current, causing various distortions in the time-series signal.
The DX51mkIII DX51mkIII has high-speed signal processing to achieve a stable feedback level with no signal distortion and a complete internally balanced system.
This amplifier is a single-end type, all stages are pure class A drive, and both input and output stages are balanced, and a cross-balance feedback system is adopted.

Digital inputs include coaxial, optical, AES/EBU, and CEC superlink.
The CEC Superlink transmits audio and clock data separately without passing through SPDIF encoding to minimize degradation of sound quality.

It uses a push-pull DAC circuit with two current biases to improve the D/A conversion accuracy. This circuit eliminates the 0 cross distortion that occurs in principle by applying a bias in the + and - directions near the current value of 0.

Model Rating
Type D/A converter
Digital input Coaxial, Optical, AES/EBU (XLR)
CEC Super Link (D-sub 9 pin)
Audio Out Balanced (XLR) : 4 vrms
Unbalanced (RCA) : 2 vrms
DAC NPC Corporation SM5865CM, 24 bit
Pwer 100 V, 50Hz/60Hz
Power consumption 6W
External dimensions Width 435x Height 100x Depth 294 mm
Weight 6.7kg
Attachment CEC superlink cable
Power cable