HP-A4BL
D/A converter & headphone amplifier
back panel
New standard model for easy enjoyment of balanced headphones
A new standard model based on the HP-A4 headphone amplifier with built-in DAC for easy enjoyment of balanced headphones.
About Windows 10 (Anniversary Edition) or later
Please use FOSTEX USB Audio Driver Ver2.2.1 or later version.
About Windows 10 (Creators Update) or later
Since Windows 10 Creators Update, the USB AUDIO 2.0 driver, which has been prepared exclusively by the device manufacturer, is now included in the Windows standard, causing a problem. Please check the FOSTEX USB Audio Driver download page for a temporary solution.
About macOS10. 13 High Sierra
2017.10.12 Update: We have confirmed that the device works with the main unit software version 1.10 or higher.
Note when using on macOS 10. 12 Sierra
HP-A4 software version 1.10 or higher must be installed in order to operate.
The latest version of the software can be downloaded from the software download page at the following URL.
Features
Equipped with XLR (4-pole) balanced output terminals.
Newly developed audio capacitors are used.
Low phase noise high-precision crystal (crystal oscillator) is used.
● 24bit/192kHz linear PCM audio and 11.2MHz DSD audio can be played back.
When used with MacOS, DSD up to 5.6MHz is supported.
●High-performance DAC (Burr Brown PCM1792A).
●USB AUDIO2.0 compatible with 192 kHz/24 bit asynchronous.
HI/LO gain switch (10dB) supports a wide range of headphones.
●Equipped with a digital filter that allows switching of roll-off characteristics and cut-off frequency according to the sound source.
Specifications
Main Specifications
| <Input> | |
|---|---|
| ［USB] terminal | |
| interface | USB2.0 High Speed |
| Supported sampling frequency | PCM: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz DSD: 2.8 MHz, 5.6 MHz, 11.2 MHz *Up to 5.6 MHz for MacOS |
| Supported Quantization Bit Length | 16- and 24-bit |
| Supported OS | Windows 7/8/8.1/10 (requires installation of FOSTEX USB Audio Driver ) MacOSX10.6 and up *We do not guarantee operation on public beta or other test versions of each OS. |
| ［DIGITAL IN terminal | |
| connector | Rectangular Optical |
| (computer) format | S/PDIF |
| Supported sampling frequency | 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz |
| Supported Quantization Bit Length | 16- and 24-bit |
| <Output | |
| ［PHONES BALANCED] pin | |
| connector | XLR-4pin |
| Maximum output | 300 mW or more (32 Ω) |
| Applicable load impedance | 16 to 600 ohms |
| THD | 0.04% or less (at 1 kHz) |
| frequency response | 20 Hz to 80 kHz ± 3 dB (32 Ω load, 100 mW |
| ［PHONES UNBALANCED] pin | |
| connector | 6.3 mm dia. stereo standard jack |
| Maximum output | 150 mW or more (32 Ω) |
| Applicable load impedance | 16 to 600 ohms |
| THD | 0.04 % or less (at 1 kHz) |
| frequency response | 20 Hz to 80 kHz ± 3 dB (32 Ω load, 100 mW |
| ［OUTPUT] (L, R) terminals (analog output terminals) | |
| connector | RCA pin jacks |
| Reference Output Level | 2Vrms (0 dBFS) |
| Applicable load impedance | 10 k ohm min. |
| THD | Less than 0.01 % (at 1 kHz) |
| frequency response | 20 Hz to 80 kHz ± 3 dB (reference level) |
| ［DIGITAL OUT terminal | |
| connector | Rectangular Optical |
| (computer) format | S/PDIF |
| Supported sampling frequency | 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz |
| Supported Quantization Bit Length | 16 and 24 bits |
| ＜MicroSD card slot (for firmware updates only) | |
| (computer) format | FAT32 |
| Supported Cards | microSD card (SDHC), up to 32 Gbyte |
| <General | |
| accessory | AC adapter (× 1), rubber feet (× 4), USB cable (1m × 1) |
| power (button on TV, etc.) | DC12 V, using supplied AC adapter |
| External Dimensions | 150 (W) x 34 (H, excluding rubber feet) x 157 (D, including projections) mm |
| mass | Approx. 630g |
| Power consumption | 4.2W |