Built-in USB digital-to-analogue converter
High-Resolution Audio compatible
Compatible with PCM 384 kHz/32 bit and high fidelity DSD sources
Analogue and digital inputs
Five-stage sampling indicator for digital input
Up to 14 hours battery life



The AT-PHA100 portable headphone amplifier with built-in USB DAC is engineered using innovative, hand-selected audio components together for superb sound reproduction. Compatible with PCM 384 kHz/32 bit and high fidelity DSD sources, the AT-PHA100 gives headphones a rich, detailed boost throughout the sonic range with ultra-low distortion.

  • Built-in USB digital-to-analogue converter to reproduce a higher clarity sound with less interference and extended volume range
  • NJR MUSES 8832 pre-amp delivers rich, powerful sound from low to high frequencies
  • DAC ESS ES9018K2M circuit samples 384kHz/32-bit PCM, and DSD audio sources at 2.8/5.6MHz
  • Texas Instruments LME49720 op-amp suppresses distortion for crystal clear mid to high frequencies
  • Internal rechargeable lithium polymer battery that lasts up to 14 hours (analogue signal) and up to 6 hours (digital signal)
  • All-aluminium enclosure protects delicate circuitry
System Requirements

A computer with a USB 2.0 port or higher. / CPU: Intel Core2. 2.2 GHz or greater Intel CPU or equivalent AMD CPU / RAM: 2GB or more for 32-bit OS, 4GB or more for 64-bit OS

Compatible OS

Windows XP(32bit)*, Windows 7, Windows 8, Mac OSX Mavericks(10.9) / *Technical support by Microsoft is no longer available

Compatible Headphones Impedance

10 ohms – 300 ohms

Maximum Output Level

100mW + 100mW (16 ohms, T.H.D. 10%) / 80mW + 80mW (32 ohms, T.H.D. 10%) / 10mW + 10mW (300 ohms, T.H.D. 10%)

Frequency Response

10-100,000Hz (-1dB)

Total Harmomic Distortion

Less than 0.001% (32 ohms 10mW Output)

Analog Input

3.5mm gold-plated stereo mini-jack x 1

Digital Input

USB(micro-B) x 1 / Asyncronous / DSD128(DoP), DSD64 (Native / DoP) : 24bit~32bit / PCM 384kHz, 352.8kHz, 192kHz, 176.4kHz, 96kHz, 88.2kHz, 48kHz, 44.1kHz, 32kHz :16bit~32bit


3.5mm gold-plated stereo mini-jack x 1


PC: USB bus power, DC5V/500mA / Battery: Built-in lithium-polymer rechargeable battery

Battery Charging

Approx. 10 hours from empty to full

Battery Life

Digital connection: Approx. 6 hours / Analog connecton: Approx. 14 hours


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