HP-A4 24bit DAC Headphone Amplifier Model HP-A4 is a new, improved version of the acclaimed HP-A3. It offers up to DSD 5.6MHz and PCM 192kHz for superior audio playback functionality as well as the sophisticated and class-leading appearance of the flagship HP-A8C. - See more at: http://www.fostexinternational.com/docs/products/HP-A4.shtml#content-1-tab-tab
USB buss powered operation without AC adapter
Linear PCM audio up to 24bit/192kHz and DSD audio up to 5.6MHz playback*
Quick and easy hi-resolution playback in combination with "FOSTEX Audio Player" software
HI/LO Gain selection (10dB) for wider range of headphones
Asynchronous transfer mode by using the custom made crystal
Digital Filer selecting Roll-off characteristics and Cut-off characteristics according to the audio source
Complies with USB Audio Class 2.0 on Windows XP (SP2 or later) / Vista / 7 / 8 and MacOS X 10.6 or later. **
MicroSD (SDHC) card drive on the rear panel for future firmware update.***
*requires a DSD playback software on PC such as the upcoming "FOSTEX Audio Player". Both DoP and ASIO acceptable.
** requires the dedicated driver for Windows. Not compatible with Windows XP 64bit.
*** does not playback audio data stored on a microSD card - See more at: http://www.fostexinternational.com/docs/products/HP-A4.shtml#content-1-tab-tab