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TechSpecs.md

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Technical Specifications (0404)

General

  • Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192kHz from internal crystal (no sample rate conversion)
  • Bit Depth: 24-bit I/O, 32-bit floating point processing
  • USB 2.0 Hi-Speed
  • Full 24-bit resolution at all sample rates
  • 4in/4 out channels from 44.1-96kHz
  • 2 in/2 out channels from 176.4-192kHz
  • Latency:
  • "Zero-latency" (~4.5ms latency roundtrip) direct hardware monitoring (disabled at 176.4-192kHz)
  • One-way latency of driver+EMU internal: down to 5.5 ms (default) or 2.3 ms (low latency setting) at 96kHz rate.
  • Apple CoreAudio and Apple CoreMIDI.
  • AC3 and DTS Passthru supported (not tested if this works)
  • Anti-Pop speaker protection minimizes noise during power on/off
  • Ultra-low jitter clock subsystem: < 500ps RMS in PLL mode (48kHz, Coaxial S/PDIF Sync)

Combo Microphone Preamplifier/Hi-Z/Line Inputs (2)

  • Type: E-MU XTC™ combo mic preamplifier and Hi-Z/line input w/ Soft Limiter

  • A/D converter: AK5385A

  • Gain Range: +60dB

  • Frequency Response (min gain, 20Hz-20kHz): +0.0/-0.16dB

  • Stereo Crosstalk (1kHz min gain, -1dBFS): < -110dB

  • Hi-Z Line Input:

  • Input Impedance: 1MΩ

  • Max Level: +12dBV (14.2dBu)

  • Dynamic Range (A-weighted, 1kHz, min gain): 113dB

  • Signal-to-Noise Ratio (A-weighted, min gain): 113dB

  • THD+N (1kHz at -1dBFS, min gain): -101dB (.0009%)

  • Microphone Preamplifier:

  • Input Impedance: 1.5kΩ

  • Max Level: +6dBV (+8.2dBu)

  • EIN (20Hz-20kHz, 150Ω, unweighted): -127dBu

  • Signal-to-Noise Ratio (A-weighted, min gain): 112.5dB

  • THD+N (1kHz at -1dBFS, min gain): -101dB (.0009%)

  • Phantom Power: 48V

  • Soft Limiter: 5dB max compression (software selectable)

Analog Line Outputs (2)

  • Type: balanced, AC-coupled, 2-pole low-pass differential filter

  • D/A converter: AK4396

  • Level (auto detect):

  • Professional: +12dBV max (balanced)

  • Consumer: +6dBV max (unbalanced)

  • Frequency Response (20Hz - 20kHz): 0.06/-.035dB

  • Dynamic Range (1kHz, A-weighted): 117dB

  • Signal-to-Noise Ratio (A-weighted): 117dB

  • THD+N (1kHz at -1dBFS): -100dB (.001%)

  • Stereo Crosstalk (1kHz at -1dBFS): < -114.5dB

  • Balanced/Unbalanced Output Impedance: 560Ω

Headphone Amplifier

  • Type: Class-A power amplifier
  • D/A converter: AK4396 (shared with Line Out)
  • Gain Range: 60dB
  • Maximum Output Power: 20mW
  • Output Impedance: 22Ω
  • Frequency Response (20Hz-20kHz): +0.06/-0.035dB
  • Dynamic Range (A-weighted): 114dB
  • Signal-to-Noise Ratio (A-weighted): 114dB
  • THD+N (1kHz, max gain): 600Ω load: -95.5dB (.0018%)
  • Stereo Crosstalk (1kHz at -1dBFS, 600Ω load): < -85dB

Digital I/O

  • S/PDIF*:
  • 2 in/2 out coaxial (transformer coupled)
  • 2 in/2 out optical
  • AES/EBU or S/PDIF format (software selectable)
  • MIDI
  • 1 in, 1 out

Synchronization

  • Internal crystal sync at 44.1, 48, 88.2, 96, 176.4, 192kHz
  • External sample rate sync via
  • Optical S/PDIF (44.1 - 96kHz)
  • Coaxial S/PDIF (44.1 - 96kHz)

System Requirements

  • Apple Macintosh
  • Apple Macintosh OS X Mavericks (10.9) 64 bits or higher
  • 1 available (Hi-speed) USB 2.0 port or higher