Fostex HP-A4

Sale price$399.99 Regular price$499.99
Save $100.00

Fostex HP-A4

Main Features

  • USB buss powered operation
  • 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

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.

Fostex USB Audio Driver for Windows (V.2.2.1)
Dedicated USB driver software is necessary to install on PC for Windows. Please be sure to uninstall the old driver software, if any, before installing this new software.
You can download the Windows driver here

Windows and Mac OS Compatibility
We confirmed the compatibility with Windows XP*(SP2 or later) / Vista / 7 / 8 / 8.1 / 10 and Mac OSX(10.6 or later).
* Not compliant to XP 64bit.

Compatible with MAC OS 10.12 Sierra with Firmware update V.1.1. Click here for software downloads.


USB port    sampling frequency    up to 24bit/192kHz(PCM), 5.6MHz(DSD)
    Interface    USB high speed
Digital    Connector:    optical, square
    Format    S/PDIF (16bit/24bit: 44.1 – 192kHz)

Phones    Connector:    Stereo phone
    Max Output:    100mW (32-ohm loaded)
    THD:    less than 0.04% at 1kHz, 32-ohm loaded, 100mW
    Frequency response:    20Hz - 80kHz +/-3dB (1kHz, 32ohm loaded, 100mW, FS 192kHz)
Analog     Connector:    RCA Pin
    Reference output level    2Vrms
    THD:    less than 0.01% at 1kHz
    Frequency response:    20Hz -  80kHz +-3dB (at FS 192kHz)
Digital    Connector:    Optical, square
    Format    S/PDIF (16bit/24bit: 44.1 - 192kHz)

MicroSD card slot:    microSD card (SDHC)
    Power:    USB buss powered
    Power Consumption:    2.5W
    Accessories:    1 x USB cable (1.0m), 4 x rubber foot, manual
    Dimensions:    113mm(W) x 34mm(H) x 155mm(D)
        excluding protruded parts
    Weight:    approx. 500g