D/A Converter & Headphone Amplifier

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Model HP-A4BL, designed being 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. In addition to the balanced headphone out, it also complies with DSD Audio up to 11.2MHz. 

  • 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


Sampling Frequency PCM: 44.1 to 192 kHz
DSD: 2.8 to 11.2 MHz
Bit Depth 16/24-bit
Connector 1x USB 2.0 high speed
1x S/PDIF Optical (Square) (16/24-bit, 44.1 to 192 kHz)
Connector Balanced Headphone: XLR (4-pin) Unbalanced Headphone: 1/4" / 6.3 mm Line Output: 2x analog RCA outputs S/PDIF Digital: Optical (Square) (16/24-bit, 44.1 to 192 kHz)
Maximum Output Headphones: 300 mW or more (32 Ohms loaded)
RCA Reference Output Level: 2 Vrms (0 dbFS)
Load Impedance Headphones: 16 to 600 Ohms Line Output: <10 kOhms
THD Headphone Outputs: Less than 0.04% at 1 kHz
RCA Outputs: Less than 0.01% at 1 kHz
Frequency Response Headphones: 20 Hz to 80 kHz ±3 dB (32 Ohms, 100 mW)
RCA Outputs: 20 Hz to 80 kHz ±3 dB
Digital: 44.1 to 192 kHz
SD Card Slot 1x microSD slot (for firmware updates)
Format: FAT32 Compatible Card: microSD card (SDHC), up to 32 GB
Power Power Supply: 12 VDC, 1.5 A
Dimensions (W x H x D) 5.9 x 1.3 x 6.2" / 150.0 x 34.0 x 157.0 mm, excluding protruded parts
Weight 22.2 oz / 630.0 g, approximate
More Information
Price $599.00
Vendor Item Number HP-A4BL
Special Order 1
Coming Qty 0
Manufacturer Fostex
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