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Fostex HP-A4 24-Bit USB DAC Headphone Amplifier


$279.99

Estimated delivery on 3 August - 14 September, 2025
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Items Included

  • Fostex HP-A4 24-Bit USB DAC Headphone Amplifier
  • 1m USB Cable
  • 4 x Rubber Feet
  • Limited 1-Year Manufacturer Warranty
Key Features
  • Up to 24-Bit/192kHz PCM Support
  • Up to 5.6MHz DSD Support
  • USB 2.0 Input
  • Optical S/PDIF Digital I/O
  • Front-Panel 1/4″ Headphone Output
  • 2 Gain-Staging Levels
  • Selectable Filter
  • Mac & Windows Compatible
  • Includes USB Cable & Rubber Feet

The HP-A4 24-Bit USB DAC Headphone Amplifier from Fostex supports PCM audio up to 24-bit/192kHz and DSD audio up to 5.6MHz. It features a front-panel 1/4″ 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 10dB without needing to touch the volume knob. The selectable filter allows you to cut-off lower frequencies if desired. A USB cable and 4 rubber feet are included.

USB bus powered
Linear PCM audio up to 24-bit/192 kHz and DSD audio up to 5.6 MHz playback
High-resolution playback in combination with “FOSTEX Audio Player” software
HI/LO Gain selection (10 dB)
Asynchronous transfer mode using custom-made crystal
Digital filter with selectable roll-off and cut-off characteristics
Complies with USB Audio Class 2.0 on Windows XP (SP2 or later), Vista, 7, 8 and Mac OS X 10.6 or later
microSD (SDHC) card drive on the rear panel for future firmware updates
Category:
Digital Audio I/O
1x TOSLINK Optical S/PDIF Input
1x TOSLINK Optical S/PDIF Output
Connectivity
Digital Audio I/O
1x TOSLINK Optical S/PDIF Input
1x TOSLINK Optical S/PDIF Output
Network I/O
No
Sync I/O
No
Performance
Frequency Response
Headphone Outputs:
20 Hz to 80 kHz ±3 dB (at 192 kHz, 1 kHz, 32-Ohm Load, 100 mW)
RCA Outputs:
20 Hz to 80 kHz ±3 dB (at 192 kHz)
Maximum Output Level
RCA Outputs:
2 Vrms
THD
Headphone Outputs:
< 0.04 dB (1 kHz, 32-Ohm Load, 100 mW)
RCA Outputs:
< 0.01 dB (1 kHz)
Digital Audio
Sample Rates
Up to 192 kHz (PCM)
Up to 5.6 MHz (DSD)
TOSLINK Input:
44.1 to 192 kHz
Bit Depths
16 / 24-Bit
Power
Power Requirements
USB Bus Power
Power Consumption
2.5 W
Physical
Dimensions
6 x 4 x 1″ / 155 x 113 x 34 mm
Weight
17.0 oz / 500.0 g
Packaging Info
Package Weight
1.7 lb
Box Dimensions (LxWxH)
10.3 x 6.3 x 1.9″

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