Accuphase DA-9601

Commentary

Business D/A converter supporting 96kHz/24bit.

The D/A converter uses MMB (Multiple Multi-Bit) method.
This method is a unique method developed by AccuPhase. It is designed to greatly improve performance by driving a large number of carefully selected 20-bit D/A converters in parallel. The high-speed output of a digital filter is input to each converter in parallel, and the high-speed output immediately after D/A conversion is accurately added.
The conversion output of each DAC is an analog signal with a conversion error e added to the signal component S. By the addition effect, the conversion error of the MMB output is reduced by 1 √ ￣ n with respect to the signal component. This improves not only the S/N ratio but also the dynamic range, linearity, harmonic distortion and other important characteristics of D/A converters. In the case of the MMB method, performance is improved at all frequencies and all signal levels regardless of the frequency or level of the signal, and the improvement effect can be obtained. By this, the minute level noise that hangs around the output signal, which was difficult to solve until now, can be reduced.
Since the DA 9601 has eight DACs operating in parallel, the overall performance is approximately 2.8 (√ 8) times higher than that of the converter 1 circuit.
By attaching optional crystal, it is possible to correspond to any sampling frequency.

Noise is eliminated by completely electrically separating the analog and digital sections.

Three input formats are supported : AES/EBU, SPDIF, and SDIF2.

The analog output has a high output signal voltage of 25 dBU.

The original noise-shaping volume enables low-signal-degradation level control up to very low levels above -90dB.

Model Rating

Type	D/A converter
Total harmonic distortion factor + noise	0.002% (24-bit input, at1kHz, 0 dBFS : full scale)
Frequency characteristic	10 Hz to 42 kHz + 0. 3-0. 6 dB
S/N ratio (Nyquist band : band with sampling frequency of 1/2)	108 dB min (acoustic compensation)
Channel separation	108 dB min (10 Hz to 42 kHz)
Sampling frequency	SPDIF, AES/EBU : Lock 32 kHz to 96 kHz input signal 44.1/48.0/88.2/96kHz is locked with crystal accuracy ± 50 ppm SDIF2 Lock only 44.1/48.0/88.2/96kHz at ± 50 ppm (32 khz, 44.056 khz, etc. can be locked at ± 50 ppm by attaching optional crystal)
Input impedance	AES/EBU : 250 Ω SDIF2 : 75 Ω
Analog Output (0 dBU = 0.775 v)	Full Scale Level : 25 dBU + 0.5 -0 Output difference between channels : 0.2 dB max
Analog output terminal	XLR-male 1pin:GND(shield) 2pin:Hot(positive) 3pin:Cold(negative)
Output load impedance	+ 23 dBU : 600 Ω + 25 dBU : 1k Ω
Output impedance	Between XLR2 and 3 : 10 Ω
Operating temperature	Ambient Temperature : 0 to + 40 ° C
Power supply voltage	100 VAC (120 V, 230 V are internally switched), 50Hz/60Hz
Power consumption	23W
Maximum external dimensions	Width 482.5x Height 47x Depth 370 mm (Whole, Including Legs) Width 482.5x Height 44x Depth 5 mm (panel size) 1U (rack mount, 19 "standard rack mount)
Weight	5.2kg