Fostex HP-A3mk2 Headphone Amplifier & DAC

The HP-A3mk2 is a USB DAC that operates on USB bus power. USB audio and optical digital audio signals from a PC can be converted to analog signals and output from the line output and headphone output. It operates with the USB Audio 2.0 driver of a PC (Windows or Mac OS), and can be used immediately after connecting the USB cable and performing with simple settings.

ES9016K2M from ESS Technology is used as the DAC chip
Using the high-quality DAC chip, supported sampling frequency has been greatly enhanced to 192 kHz. Users can enjoy higher quality sound without sacrificing ease of use.

Further improved analog circuitry
The analog circuitry has been newly designed to match the higher supported sampling frequency, and has achieved performance of high-end products, including improved THD (total harmonic distortion).

Gain switch to accommodate various playback sources
The headphone output amplifier gain can be switched between HI and LO positions. The HI position provides 10 dB increase in volume over the LO position. The HI position is effective for low-level input signals and can be used with a variety of playback sources.