audio technica / ATHA90USB

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A 24-bit/192kHz compatible headphone amplifier that reproduces the realistic atmosphere and presence that only high-resolution sound sources can provide.

■ Supports 24-bit/192kHz for enjoying high-resolution audio sources.
■ High-performance D/A converter (AK4396) reproduces sound faithfully to the source.
■ Highly rigid zinc die-cast body suppresses unnecessary vibrations.
・Distortion and unnecessary vibrations generated within the unit itself are suppressed, achieving high sound quality.
■ NJR's MUSES operational amplifier delivers clear, deep sound reproduction.
■ Two selectable output systems: digital optical output and analog line output.
■ Built-in microphone with ALC (Auto Level Control) enables smooth internet calls.

■ System Requirements
- A computer equipped with a USB 2.0-compatible USB port as standard
- CPU: Intel Core 2 CPU 2.2GHz or higher, or an AMD CPU equivalent to Intel
- RAM: 2GB or more for 32-bit OS, 4GB or more for 64-bit OS
■ Supported OS
- Windows XP (32-bit), Windows 7, Windows 8, Mac OS X 10.8.3 or later (Mountain Lion)
■ Supported Sampling Frequencies
- Output (Headphone Output/Line Output): 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz
- Input (Microphone): 44.1kHz, 48kHz
■ Output Mode
- Windows XP: Asynchronous mode (DS, ASIO)
- Windows 7, Windows 8: Asynchronous mode (DS, ASIO, WASAPI)
- Mac OS: Asynchronous mode
- Windows 7, Windows 8, Mac OS X: Encoded digital audio output
■ Headphone output terminal
- Output: φ3.5mm stereo mini jack
- Supported headphone impedance: 16Ω to 300Ω
- Maximum output level: 50mW + 50mW (16Ω to 64Ω at 10% T.H.D.), 30mW + 30mW (150Ω at 10% T.H.D.), 20mW + 20mW (300Ω at 10% T.H.D.)
- Frequency response: 10 to 90kHz (-3dB, Fs=192kHz or higher)
- Total harmonic distortion: 0.004% or less (32Ω, 20mW output)
- Signal-to-noise ratio: 110dB or higher (JIS-A)
■ Line Output Terminal
- Output: φ3.5mm stereo mini jack
- Frequency Response: 10-90kHz (-3dB, at Fs=192kHz or higher)
- Total Harmonic Distortion: 0.003% or less (0dBv, at 1kHz)
- Signal-to-Noise Ratio: 103dB or more (JIS-A)
- Rated Output: 2Vrms
■ Optical Digital Output Terminal
- Supported Formats: S/PDIF, PCM Audio, Encoded Digital Audio
■ Microphone Input
- Built-in microphone, ALC circuit (automatic level control)
■ Dimensions (excluding protrusions): H24 x W80 x D95mm
■ Weight (unit only): Approx. 180g
■ Included Accessories: 1.0m USB cable (2.0 compliant)