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Fostex HP-A4BL Headphone Amplifier + DAC


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Warranty length 2 Years
Brand Fostex

Tech Specs

Interface: USB 2.0 Hi Speed
Sampling:PCM 44.1kHz-192kHz
DSD: 2.8MHz, 5.6MHz, 11.2MHz
Quantization :16bit, 24bit
Digital: Optical, Square
Format: S/PDIF
Quantization: 16bit, 24bit


Phones Balanced: XLR (4-pin)
Max out: 300mW+ (32 ohm)
Load impedance: 16 - 600 ohm
THD: less than 0.04% (@1kHz)
Freq Response: 20Hz - 80kHz (+/-3dB)


Phone Unbalanced: 1/4" stereo jack
Max output: 300mW + (32 ohm)
Load impedance: 16 - 600 ohm
THD: Less than 0.04% (@1kHz)
Freq Response: 20Hz - 80kHz (+/-3dB)


Analog output: RCA Pin
Reference output: 2Vrms (0 dBFS)
Load impedance: <10k ohm THD (0.01%)
Freq Response: 20Hz-80kHz (+3dB)


Digital Output: Optical (square)
Format: S/PDF
Quantaization: 16, 24bit


MicroSD: card slot, FAT32
Compatible: (SDHC) <32GB


Rubber foot (x4), USB cable
Manual, AC adapter


Power supply: DC12V
Dimensions (WHD): 150 x 34 x 157mm
Weight: Approx 630g

Product Description

Fostex HP-A4BL, 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 for discerning headphones listeners.

Balanced & Powerful

The HP-A4BL, as the BL suggests, adds a 4-pin balanced output for optimum performance with high-end headphone models. Being mains powered, unlike the HP-A4 which uses USB bus power only, the HP-A4BL has over 3x more output power, to handle more demanding loads, with a plus 10dB high/low gain switch for better matching.

Increased Support

The Fostex HP-A4BL implements the Burr-Brown PCM1792A DAC chip, increasing file support to include 192/24 bit PCM and DSD 11.2Mhz (DSD256/Quad). The HP-A4BL can be used with the Fostex Audio player to decode FLAC, ALAC, DSD, WAV, AIFF and most other popular audio formats.

Key Features

- Equipped with 4-pin XLR balanced output
- Newly developed audio-grade capacitor is adopted
- Highly precise crystal with low phase noise is adopted
- Playback 24bit/192kHz PCM and 11.2MHz DSD audio
- High performance DAC (Barrbrown PCM1792A) is equipped
- Asynchronous transfer up to 192kHz/24bit compatible
- HI/LO Gain selection (10dB), wider headphone selection
- Digital Filter selecting Roll-Off/Cut-off frequencies

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