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ZeroUno HPA

Technical data

  • The circuit of the ZeroUno DAC-HPA is based on the ESS SABRE32 ES9018S DAC chip plus a proprietary hybrid filter design and encapsulation against external noises.
  • For optimum performance the SABRE chip runs on a proprietary implementation of special developed firmware
  • One motherboard is based on a four-layer PCB with extra thick copper traces to achieve ultra-short signal paths with minimal wiring to avoid electromagnetic induction of noise and to insure perfect grounding
  • Discrete power supplies built for the digital and the analogue sections using six toroidal transformers - the last generation of ultra-low noise rectifier diodes and high quality – low noise regulators
  • Audio-grade resistors and capacitors
  • Comprehensive noise regulation for all digital circuits
  • Jitter free operation by patented high performance algorithm
  • Integrated 32 bits volume control with a residual noise below -130dB for the best performances even at very low output levels
  • On board output level setup to match different sensitivity levels of the direct connects power amplifies
  • Voltage-compensated, ultra-low phase noise and low jitter crystal oscillators (clock) acts as master clock
  • Two separated clocks for sampling families of 44.1, 88.2, 176.4, 352.8 kHz and 48, 96, 192, 384 kHz
  • DAC output stage with the shortest possible signal path based on custom made amorphous audio transformers produced by Lundahl, with first order discrete analogue filter for the best THD and digital noise suppression
  • True Class A discrete built analog output stage with zero negative global feedback
  • Separately powered USB chip by a “quasi battery power supply” to avoid any distortion induced by the connected computer (no connection to the +5V powerline of the USB cable)
  • USB input based on XMOS xCore audio chip with bit perfect transfer for 16bit, 24bit or 32bit data in PCM format up to 384 kHz, including support for native DSD/DoP and MQA.
  • 4 Digital-Inputs: 1x USB 2.0; 1x true S/PDIF 75 Ohm BNC or true AES/EBU 110Ohm XLR; 1x S/PDIF RCA; 1x S/PDIF optical
  • USB input compatible with following audio formats via PC and MAC:

-     PCM: 44.1; 48; 88.2; 96; 176.4; 192; 352.8 and 384 kHz up to 32 bits

-     DSD (DoP): 2.822 MHz / DSD64, 3.072 MHz, 5.644 MHz / DSD128

-     MQA all formats

  • SPDIF inputs (AES/EBU, BNC, RCA) compatible with PCM signals from 44.1, 48, 88.2, 96, 176.4 and 192 kHz, up to 24 bits. The optical input accepts music files with a resolution up to 24/96 kHz
  • LCD Display with variable brightness and letter size for better reading from listening position
  • Infrared remote control with direct function keys for volume, balance, absolute polarity, mute and input channel
  • No drivers required for LINUX or MAC OSX

USB Audio 2.0 driver available for Windows XP/Vista/7/8/10

  • Gain = 26dB (x20); 
  • Zout < 1 ohm;
  • Vo max = ±17V (24dBu)
  • Pre-gain between 0dB to +24dB in step of 1dB  
  • Pout = 2.5Wrms onto 30ohm
  • Headphone load within 30 to 600 ohm
  • Power amplifier input impedance ≥ 600ohm
  • Distortion with 1KHz, 1Vrms, into 30ohm load: 2nd harmonic below -102db; 3rd harmonic below -100dB
    4th harmonic below -125dB; 5th harmonic below -120dB