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HomePro AudioComputer AudioComputer Audio HardwareAD/DA ConvertersFostex HP-A4

Fostex HP-A4 24-Bit USB DAC Headphone Amplifier

BH #FOHPA4 • MFR #HP-A4
Fostex
Fostex HP-A4 24-Bit USB DAC Headphone Amplifier
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
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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.
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Expected availability: 2-4 weeks
$399.99
$12/mo. with 0% interest for 36 mos.^
36 equal monthly payments required, offer ends Dec 17, 2020.

Important Notice

  • This item is noncancelable and nonreturnable.
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Fostex HP-A4 Overview

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
UPC: 636827304221

Fostex HP-A4 Specs

Converter TypeD/A Converter
Number of Channels2
Connectivity
Analog Audio I/O1 x 1/4" TRS Headphone Output
1 x Stereo RCA Coaxial Output
Digital Audio I/O1 x TOSLINK Optical S/PDIF Input
1 x TOSLINK Optical S/PDIF Output
Host Connection / USB1 x USB Type-B (USB 2.0)
Network I/ONone
Sync I/ONone
MIDI I/ONone
Performance
Frequency ResponseHeadphone 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)
Max Output LevelRCA Outputs:
2 Vrms
Headphone Output Power100 mW into 32 Ohms (Max)
THDHeadphone Outputs:
< 0.04 (1 kHz, 32-Ohm Load, 100 mW)
RCA Outputs:
< 0.01 (1 kHz)
Digital Audio
Sample RatesUp to 192 kHz (PCM)
Up to 5.6 MHz (DSD)
TOSLINK Inputs:
44.1 to 192 kHz
Bit Depths16 / 24-Bit
Compatibility
OS CompatibilityWindows XP (SP2 or Later)
Windows Vista
Windows 7 / 8
macOS 10.6 or Later
Power
Power RequirementsUSB Bus Power
Power Consumption2.5 W
Physical
Dimensions6 x 4 x 1" / 155 x 113 x 34 mm
Weight17.0 oz / 500.0 g
Packaging Info
Package Weight1.7 lb
Box Dimensions (LxWxH)10.3 x 6.3 x 1.9"
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