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Fostex HP-A4BL 24bit DAC headphone Amp w/Balanced Output


Product Description

Our pricing for this product is the "MAP Pricing." This means that the prices shown here are the "minimum advertised prices" permitted by the manufacturer.

Model HP-A4BL, designed being based on the current HP-A4, is an affordable USB DAC & Headphone amp offering balanced connection for headphones that is becoming more popular in the market. In addition to the balanced headphone out, it also complies with DSD Audio up to 11.2MHz.

USB Driver for Windows (V.2.1.0)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 7 / 8 / 8.1 / 10 and Mac OSX(10.6 or later).


  • Linear PCM audio up to 24bit/192kHz and USD audio up to 11.2MHz playback
  • USD & Optical input / output, RCA output, incl. AC Adapter
  • Asynchronous transfer mode & digital filtering options
  • HI/LO Gain selection (10dB) for wider range of headphones
  • Equipped with 4-pin XLR balanced output
  • Newly developed audio-grade capacitor is adopted
  • Highly precise crystal with low phase noise is adopted
Input [USB] terminal  
Interface USB 2.0 Hi Speed
Sampling Frequencies PCM 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz DSD 2.8MHz, 5.6MHz, 11.2MHz
Quantization 16bit, 24bit
[Digital In] terninal  
Format S/PDIF
Sampling Frequencies 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz
Quantization 16bit, 24bit
Connector Optical, Square
Output [PHONES BALANCED] terminal
Connector XLR (4-pin)
Maximum output 300mW or more (32 ohm)
Load impedance 16 - 600 ohm
THD less than 0.04% (at 1kHz
Frequency Response 20Hz - 80kHz (+-3dB, 32 ohm, 100mW)
Connector 1/4" stereo jack
Maximum output 300mW or more (32 ohm) Applicable load impedance :16 - 600 ohm
THD less than 0.04% (at 1kHz)
Frequency Response 20Hz - 80kHz (+-3dB, 32 ohm, 100mW)
[OUTPUT] (L,R) terninal (Analog output)
Connector RCA Pin
Reference output level 2Vrms (0 dBFS)
Applicable load impedance less than 10k ohm
THD less than 0.01% (at 1kHz)
Frequency Response 20Hz-80kHz (+3dB)
[DIGITAL OUT] terminal  
Connector Optical (square)
Format S/PDF
Frequency Response 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz
Quantaization 16, 24bit
General [microSD] card slot (for firmware upgrade only)
Format FAT32
Compatible card microSD card (SDHC), up to 32GB
Accessories Rubber foot (x4), USB cable, Manual, AC adapter
Power supply DC12V
Measurements 150(W) x 34(H) x 157(D)mm including protrusion
Weight:approx 630g

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