Fostex HP-A4 24bit Digital to Analog Converter and Headphone Amplifier - OPEN BOX

Item # FSXHPA4OB (Part # AMS-HP-A4)
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Item Description:
  • USB buss powered operation without AC adapter
  • Linear PCM audio up to 24bit/192kHz & DSD audio up to 5.6MHz playback
  • Quick & easy hi-resolution playback
  • HI/LO Gain selection (10dB) for wider range of headphones
  • ***OPEN BOX***


    This OPEN BOX product you are browsing has been inspected by our qualified technicians to ensure that it meets factory specifications and includes all factory packed accessories. It is guaranteed to be in perfect working order but it is sold in "AS IS" condition (for example, the box may be torn, there may be cosmetic scratches, etc), returns will not be accepted unless the item is found to be defective. Please contact us with any questions BEFORE placing an order. We accept PayPal and all major credit cards. We do our best to describe each item we are selling to the best of our ability. Bear in mind that the item is sold as-is.


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    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.

    USB Driver for Windows (V.2.03)

    Dedicated USB driver software is necessary to install on PC for Windows. Mac OS (10.6.1 or later) works with its own USB driver. Please be sure to uninstall the old driver software before installing this software.

    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.

    Product Features:

    • 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 Filter 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

    Product Specifications:


    • 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
    HP-A4 DAC Headphone Amplifier
    USB Cable
    Rubber Foot (4)
    Owner's Manual
    This Kit Includes: