Fostex HP-A3

Buss-Powered 32-bit Digital to Analog Converter DAC

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Fostex HP-A3 Portable Headphone Amplifier

The Fostex HP-A3 Buss-Powered 32-bit Digital to Analog Converter DAC Offer an Incredible Listening Experience

The new Fostex HP-A3 is the perfect DAC for Computer Audio. This high quality unit features 32bit D/A Conversion with an integrated headphone amplifier exclusively designed to get the most from and PC audio set-up. Why settle for 'built-in' D/A conversion when you can drastically improve the quality of your audio with a Fostex HP-A3?

USB Cables

Now available, new ET-U1.0 and ET-U0.5 USB constructed using OCF Ag coated annealed copper wire. Click here for more information.

Windows 10 and Mac OS X 10.11 (El Capitan) Compatibility

We have not confirmed the compatibility with Windows 10 and Mac OS X 10.11 (El Capitan) for our USB DAC products yet. We will keep updating the compatibility status on our website. In order to continue to use our USB DAC products, we recommend staying with the current OS for the time being. Thank you for your kind understanding.

General Features:

  • Equipped with high-grade AKM 32bit DAC AK4390
  • Power supply is built-in to reproduce the stable electrical supply
  • Condensers and OP amp are designed exclusively for audio applications
  • USB or digital (optical) input selector button
  • Headphones or RCA (analog) output selector button
  • Doubles as digital to digital converter from USB digital audio to optical output
  • Fixed sampling rate of 96 kHz with USB input
  • Compatible with Mac OSX and Windows XP or late
  • 32-Bit Digital to Analog Conversion
  • Works With Audio Up to 24-bit/96kHz
  • USB Bus Powered
  • Built-In Headphone Amplifier
  • 2x RCA or 1x 1/4" Headphone Outputs
  • S/PDIF Digital Input & Output
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

DAC Specifications

Power Requirement
This is the required way to give the unit power. Common power sources are 120V AC (Common house plugs), batteries, or a combination of the two. If the headphone amplifier uses batteries, this will list the type of batteries that are required. Please refer to the description to find out how many are required for the unit to be properly powered.
Rechargeable Lithium Polymer Battery
Sample Rate
24-bit at 96 kHz
Digital Inputs
The type of digital inputs the digital-to-analog converter features.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
20 - 20,000 Hz
THD (Total Harmonic Distortion)
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
Output Impedance
This is the amount of impedance that the microphone allows.
32 ohms

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Fostex HP-A3

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Fostex HP-A3

Buss-Powered 32-bit Digital to Analog Converter DAC


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