Brand New FOSTEX HP-A4 24bit DAC Headphone Amplifier USB Powered Audio Free Ship

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The Fostex HP-A4 is a new, improved version of the acclaimed HP-A3. It supports PCM audio up to 24-bit/192 kHz and DSD audio up to 5.6MHz for superior playback functionality. 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. HP-A4 operates on USB bus power and features a front-panel 1/4-inch stereo headphone output, rear-panel stereo RCA outputs, and optical S/PDIF I/O.


The HP-A4 has 2 gain staging levels, allowing you to boost the output of the amp by 10 dB without needing to touch the volume knob. HP-A4 offers quick and easy hi-resolution playback in combination with Fostex Audio Player software. Additional features include Hi/Lo gain selection (10 dB) for wider range of headphones, asynchronous transfer mode, and digital filter with selectable roll-off and cut-off characteristics. Founded in 1973, Fostex is an acclaimed manufacturer of location sound, multi-track recording, and speaker products.


General Features:



  • Fostex HP-A4 Buss-Powered 24-bit DAC Desktop Headphone Amplifier


  • 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 updates


  • Authorized Internet Dealer


  • 1-year Manufacturer's Warranty


Product Specifications:



  • Input:


    • 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)


  • Output:


    • 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)


  • General:


    • 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