24bit DAC Headphone Amplifier

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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. 

In Detail

  • 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.***


Sampling Frequency Up to 192 kHz (PCM)
Up to 5.6 MHz (DSD)
Bit Depth Up to 24-bit
Connector 1x USB high speed
1x S/PDIF TOSlink (16/24-bit, 44.1 to 192 kHz)
Connector 1x 1/4" (6.3 mm) stereo headphone output
2x analog RCA outputs
1x S/PDIF TOSlink (16/24-bit, 44.1 to 192 kHz)
Maximum Output 100 mW (32 Ω loaded)
RCA Outputs: 2 Vrms reference output level
THD Headphone Output: Less than 0.04% at 1 kHz, 32 Ω loaded, 100 mW
RCA Outputs: Less than 0.01% at 1 kHz
Frequency Response 20 Hz to 80 kHz +/-3dB (1 kHz, 32 Ω loaded, 100 mW, FS 192 kHz)
RCA Outputs: 20 Hz to 80 kHz +/-3 dB (at FS 192 kHz)
SD Card Slot 1x microSD slot (for firmware updates)
Compatibility Windows: XP (SP2 or later), Vista, 7, 8
Mac: OS X 10.6 or later
Power USB bus powered
Power Consumption 2.5 W
Dimensions (W x H x D) 4 x 1 x 6" (113 x 34 x 155 mm), excluding protruded parts
Weight 17 oz (500 g), approximate
More Information
Price $499.00
Vendor Item Number HP-A4
Special Order 1
Coming Qty 0
Manufacturer Fostex
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