Fostex HP-A4
24-bit DAC Headphone Amplifier

OUR PART #  HP-A4

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The Fostex HP-A4 is a 24-bit DAC headphone amplifier that offers Direct Stream Digital audio up to 5.6 MHz and Linear Pulse Code Modulation audio up to 24-bit / 192 kHz. The HP-A4 is USB bus-powered without the need for an AC adapter and offers a sleek, sophisticated appearance that will fit in well with the most discerning of tastes.

Fostex HP-A4 Includes:

  • 1x USB Cable (1.0m)
  • 4x rubber foot
  • Manual

Fostex HP-A4 Features:

  • USB bus-powered operation without AC adapter
  • Linear PCM audio up to 24-bit / 192 kHz and DSD audio up to 5.6 MHz playback*
    • *NOTE:  Requires a DSD playback software on PC such as the "FOSTEX Audio Player." Both DoP and ASIO acceptable
  • HI/LO Gain selection (10 dB) for wide range of headphone compatibility
  • Asynchronous transfer mode by using the custom made crystal
  • Digital Filter selecting Roll-Off characteristics andCut-Off characteristics according to the audio source
  • Complies with USB Audio Class 2.0 on Windows XP (SP2or later) / Vista / 7 / 8 and Mac OSX 10.6 or later**
    • **NOTE:  Requires the dedicated driver for Windows. Not compatible with Windows XP 64-bit.
  • MicroSD (SDHC) card drive on the rear panel for futurefirmware updates***
    • ***NOTE:  Does not playback audio data stored on a microSD card

Fostex HP-A4 Specifications:

  • Input:
    • USB Port Sampling Frequency:  Up to 24-bit / 192 kHz (PCM), 5.6 MHz (DSD)
    • Interface:  USB High Speed
    • Digital Connector:  Optical, Square
    • Format:  S/PDIF (16-bit / 24-bit:  44.1 kHz - 192 kHz)
  • Output:
    • Phones Connector:  Stereo Phone
      • Max Output:  100 mW (32 Ohm loaded)
      • THD:  Less than 0.04% at 1 kHz, 32 Ohm loaded, 100 mW
      • Frequency Response:  20 Hz - 80 kHz +/- 3 dB (1 kHz, 32 Ohm loaded, 100 mW, FS 192 kHz)
    • Analog Connector:  RCA Pin
      • Reference Output Level:  2 Vrms
      • THD:  less than 0.01% at 1 kHz
      • Frequency Response:  20 Hz - 80 kHz (at FS 192 kHz)
    • Digital Connector:  Optical, square
      • Format:  S/PDIF (16-bit / 24-bit:  44.1 kHz - 192 kHz)
  • General:
    • MicroSD Card Slot:  microSD Card (SDHC)
    • Power:  USB bus-powered
    • Power Consumption:  2.5 W
    • Dimensions (WxHxD):  113mm x 34mm x 155mm
    • Weight:  Approx. 500 g

Fostex HP-A4
24-bit DAC Headphone Amplifier

OUR PART #  HP-A4

Product Information:

The Fostex HP-A4 is a 24-bit DAC headphone amplifier that offers Direct Stream Digital audio up to 5.6 MHz and Linear Pulse Code Modulation audio up to 24-bit / 192 kHz. The HP-A4 is USB bus-powered without the need for an AC adapter and offers a sleek, sophisticated appearance that will fit in well with the most discerning of tastes.

Fostex HP-A4 Includes:

  • 1x USB Cable (1.0m)
  • 4x rubber foot
  • Manual

Fostex HP-A4 Features:

  • USB bus-powered operation without AC adapter
  • Linear PCM audio up to 24-bit / 192 kHz and DSD audio up to 5.6 MHz playback*
    • *NOTE:  Requires a DSD playback software on PC such as the "FOSTEX Audio Player." Both DoP and ASIO acceptable
  • HI/LO Gain selection (10 dB) for wide range of headphone compatibility
  • Asynchronous transfer mode by using the custom made crystal
  • Digital Filter selecting Roll-Off characteristics andCut-Off characteristics according to the audio source
  • Complies with USB Audio Class 2.0 on Windows XP (SP2or later) / Vista / 7 / 8 and Mac OSX 10.6 or later**
    • **NOTE:  Requires the dedicated driver for Windows. Not compatible with Windows XP 64-bit.
  • MicroSD (SDHC) card drive on the rear panel for futurefirmware updates***
    • ***NOTE:  Does not playback audio data stored on a microSD card

Fostex HP-A4 Specifications:

  • Input:
    • USB Port Sampling Frequency:  Up to 24-bit / 192 kHz (PCM), 5.6 MHz (DSD)
    • Interface:  USB High Speed
    • Digital Connector:  Optical, Square
    • Format:  S/PDIF (16-bit / 24-bit:  44.1 kHz - 192 kHz)
  • Output:
    • Phones Connector:  Stereo Phone
      • Max Output:  100 mW (32 Ohm loaded)
      • THD:  Less than 0.04% at 1 kHz, 32 Ohm loaded, 100 mW
      • Frequency Response:  20 Hz - 80 kHz +/- 3 dB (1 kHz, 32 Ohm loaded, 100 mW, FS 192 kHz)
    • Analog Connector:  RCA Pin
      • Reference Output Level:  2 Vrms
      • THD:  less than 0.01% at 1 kHz
      • Frequency Response:  20 Hz - 80 kHz (at FS 192 kHz)
    • Digital Connector:  Optical, square
      • Format:  S/PDIF (16-bit / 24-bit:  44.1 kHz - 192 kHz)
  • General:
    • MicroSD Card Slot:  microSD Card (SDHC)
    • Power:  USB bus-powered
    • Power Consumption:  2.5 W
    • Dimensions (WxHxD):  113mm x 34mm x 155mm
    • Weight:  Approx. 500 g
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