Fostex / HP-A4BL

Variations

This is a standard model of headphone amplifier with built-in DAC that allows you to easily enjoy balanced headphones.

■ Equipped with XLR (4-pole) balanced output terminal
■ Plays linear PCM audio up to 24-bit/192kHz and DSD audio up to 11.2MHz
* Supports up to DSD5.6MHz when used with MacOS
■ Uses newly developed audio capacitors
■ Equipped with a high-performance DAC (Burr-Brown PCM1792A)
■ Uses a low-phase-noise, high-precision crystal (crystal oscillator)
■ USB AUDIO 2.0 compatible for 192 kHz/24-bit Asynchronous compatible
■HI/LO gain switch (10dB) supports a wide range of headphones
■Digital filter that allows you to adjust the roll-off characteristics and cutoff frequency to suit the sound source

■Accessories: AC adapter (x1), rubber feet (x4), USB cable (1m x1)
■Power supply: DC12V, using included AC adapter
■Weight: Approx. 630g
■Power consumption: 4.2W
■Dimensions: 150 (W) x 34 (H, excluding rubber feet) x 157 (D, including protrusions) mm

[USB] terminal
■Interface: USB 2.0 High Speed
■Supported sampling frequencies:

PCM: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz

DSD: 2.8MHz, 5.6MHz, 11.2MHz (MacOS supports up to 5.6MHz)
■Supported Bit Depth: 16, 24-bit
■Supported OS:

Windows 7/8/8.1/10 (FOSTEX USB Audio Driver installation required)

Mac OS X 10.6 and later

[DIGITAL IN] Terminal
■Connector: Square optical
■Format: S/PDIF
■Supported Sampling Frequencies: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz
■Supported Bit Depth: 16, 24-bit

[PHONES BALANCED] Terminal
■Connector: XLR 4-pin
■Maximum output power: 300mW or more (32Ω)
■Suitable load impedance: 16–600Ω
■Total harmonic distortion: 0.04% or less (@ 1kHz)
■Frequency response: 20Hz–80kHz ±3dB (32Ω load, 100mW output)

[PHONES UNBALANCED] jack
■Connector: φ6.3mm standard stereo jack
■Maximum output power: 150mW or more (32Ω)
■Suitable load impedance: 16–600Ω
■Total harmonic distortion: 0.04% or less (@ 1kHz)
■Frequency response: 20Hz–80kHz ±3dB (32Ω load, 100mW output)

[OUTPUT] (L, R) Terminals (Analog Output Terminals)
■Connector: RCA pin jack
■Reference Output Level: 2Vrms (0dBFS)
■Compatible Load Impedance: 10kΩ or greater
■Total Harmonic Distortion: 0.01% or less (@ 1kHz)
■Frequency Response: 20Hz to 80kHz ±3dB (Reference Level)

[DIGITAL OUT] Terminal
■Connector: Square optical
■Format: S/PDIF
■Supported Sampling Frequencies: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz
■Supported Bit Depths: 16-bit, 24-bit

■Format: FAT32
■Supported Cards: microSD Card (SDHC), up to 32GB
*This unit cannot play audio data stored on a microSD card.