The Fostex HP-A4BL builds on the original HP-A4 by adding some extra features for the budget conscious but demanding headphone user.

Balanced and powerful in a small package

The HP-A4BL, as the BL suggests, adds a 4-pin balanced output for optimum performance with high-end headphone models. Being mains powered (the HP-A4 use 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.

New chip set for higher resolution formats

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.

Main Features

  • Equipped with 4-pin XLR balanced output
  • Newly developed audio-grade capacitor
  • Highly precise clock crystal with low phase noise
  • Playback of 24bit/192kHz PCM and 11.2MHz DSD audio
  • High performance DAC (Burr-Brown PCM1792A) is equipped
  • Asynchronous transfer up to 192kHz/24bit compatible with USB Audio 2.0
  • HI/LO Gain selection (10dB) for wider selection of headphones
  • Digital Filter selecting roll-off characteristics and cut-off frequencies  

Connections

Input:
Optical S/PDIF (16bit/24bit-44.1/192kHz)
Output Headphones:
4-pin balanced output
Output Line:
Optical

Electronics

Power Consumption:
2.5W
Power Supply:
USB Bus Powered

Performance

Frequency Response:
20Hz-80kHz (+/-3dB, 32 ohm, 100mW)
Max Headphone Output:
300mW or more(32-ohm loaded)
Sample Rates (PCM):
PCM 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz
Sample Rates (DSD):
2.8 MHz, 5.6 MHz, 11.2MHz
Quantisation:
16bit, 24bit
THD-Headphones:
less than 0.04% at 1kHz, 32-ohm loaded, 100mW
THD-Line Out:
less than 0.01% at 1kHz

Physical Proportions

Dimensions:
150mm(W)x34mm(H)x157mm(D)
Weight:
630g

Authorised Retail Partners

Audiologica
Audio Sanctuary
Fanthorpes HiFi
Highend Headphones
Amazon