DAC HD 24bit/384kHz, DSD&DSD 4X, USB, coax, XLR, toslink, doppio telaio, sistema smorzante
The HD DAC X is a step forward from the world-acclaimed Nagra HD DAC. It includes many of the technological advances from the HD PREAMP.
The result is a lifelike sound with warmth, texture, extreme dynamics and extended frequency response beyond what has ever been achieved by other D/A converters.

The power supply is extremely sophisticated, using ultra-fast silicon carbide rectifier diodes, ultra-low-noise voltage regulators, and a virtual battery made up of a supercapacitor bank three times larger than the one in the HD Preamp. The new HD DAC X includes no fewer than 37 regulated ultra-low-noise individual power supplies. The HD DAC X features AES-EBU, S/P-DIF on both RCA and BNC and 2x Nagra Link single-mode ST-1 optical inputs to receive future Nagra high resolution sources. The USB input uses a proprietary software designed around an 8-core X-Mos chip.

Ultra-high precision and ultra-low jitter clocks are used in this new Nagra HD DAC X. A high-performance FPGA performs all internal calculations. Every input signal is converted into DSD 256 format (11.2 MHz sample rate).

The main digital power supply has a noise level 30 times lower than the HD DAC, itself already using very low-noise circuits. The order of magnitude of the noise of these new power supplies is 0.4 to 0.8 µV rms (from 10 Hz to 100 kHz). The digital part alone uses 16 ultra-low-noise power supplies. The digital input and D/A board is built on an 8-layer, high-precision PCB.

The analog section is quite unique. The proven solutions adopted for the Nagra HD DAC have been retained and improved. Like the HD PREAMP, it uses a dual-mono topology. The analog signal coming out of the D/A board is taken to a symmetrical current amplifier that dramatically lowers its impedance. This unique stage reaches astonishing performance levels with a rise time in the order of 1800 V / µS into the 28 H inductive load of the inter-stage transformers. It makes no use of feedback nor does it provide any gain.

Digital inputs: 1x AES/EBU, 2x S/PDIF, 2x NAGRA-LINK, 1x Optical, 1x Audio USB (UCA2)
Analog outputs: 1 stereo RCA
1 stereo XLR
Output level: 1.5 VRMS
Output impedance: < 200 ohms
Analog output Noise level: -128 dBr @ 1 kHz 1.5 V
No ponderation
Distortion: < 0.02 % @ -20 dBfs
< 0.005 % (H2 filtered) @ -3 dBfs
Frequency Response: 5 Hz – 40 kHz  +0 / -1 dB
Crosstalk: > 110 dB @ 1 kHz
> 100 dB @ 20 kHz
Inter-channel phase < 0.05 ° @ 1 kHz
< 0.3 ° @ 20 kHz
< 0.5 ° @ 50 kHz
Remote automation: Input 1x 3.5mm (1/8”) stereo jack socket – Input command
Output 4x 3.5mm (1/8”) stereo jack socket – Output switching by relay
Home automation: 1x SUB-D9 connector – RS232 115200 bits/s, 8 data bits, no parity, 1 stop bit
Mains power: 100V~, 115V~, 120V~, 127V~, 230V~ or 240V~
NOT ADJUSTABLE – ±10%, 50-60Hz
Power consumption: 170W max
Mains fuse: S230V~ to 240V~ -> T 2A L (FST 5x20mm 250V)
100V~ to 127V~ -> T 3.15A L (FST 5x20mm 250V)
Operating temperature: +15°C to +35°C (+59°F to +95°F) – moderate climate
Operating environment: Indoor only – IP30
Dimensions: Power supply chassis (HD PSU) 433x436x121 mm (17.05×17.17×4.76 in)
Audio device chassis 433x436x121 mm (17.05×17.17×4.76 in)
Weight: Power supply chassis (HD PSU) 16.5 kg (36.38 lb)
Audio device chassis 13.5 kg (29.77 lb)

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TEST DRIVE : Reference 10 XV 1000-AA
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