The HP-A4 24-Bit USB DAC Headphone Amplifier from Fostex supports PCM audio up to 24-bit/192kHz and DSD audio up to 5.6MHz. It features a front-panel 1/4" stereo headphone output, rear-panel stereo RCA outputs, and optical S/PDIF I/O. The HP-A4 has 2 gain staging levels, allowing you to boost the output of the amp by 10dB without needing to touch the volume knob. The selectable filter allows you to cut-off lower frequencies if desired. A USB cable and 4 rubber feet are included.
Features
- USB bus powered
- Linear PCM audio up to 24-bit/192 kHz and DSD audio up to 5.6 MHz playback
- High-resolution playback in combination with "FOSTEX Audio Player" software
- HI/LO Gain selection (10 dB)
- Asynchronous transfer mode using custom-made crystal
- Digital filter with selectable roll-off and cut-off characteristics
- Complies with USB Audio Class 2.0 on Windows XP (SP2 or later), Vista, 7, 8 and Mac OS X 10.6 or later
- microSD (SDHC) card drive on the rear panel for future firmware updates
Specifications
| Input | |
| Sampling Frequency | Up to 192 kHz (PCM) Up to 5.6 MHz (DSD) |
| Bit Depth | Up to 24-bit |
| Connector | 1x USB high speed 1x S/PDIF TOSlink (16/24-bit, 44.1 to 192 kHz) |
| Output | |
| Connector | 1x 1/4" (6.3 mm) stereo headphone output 2x analogue RCA outputs 1x S/PDIF TOSlink (16/24-bit, 44.1 to 192 kHz) |
| Maximum Output | 100 mW (32 O loaded) RCA Outputs: 2 Vrms reference output level |
| THD | Headphone Output: Less than 0.04% at 1 kHz, 32 O loaded, 100 mW RCA Outputs: Less than 0.01% at 1 kHz |
| Frequency Response | 20 Hz to 80 kHz +/-3dB (1 kHz, 32 O loaded, 100 mW, FS 192 kHz) RCA Outputs: 20 Hz to 80 kHz +/-3 dB (at FS 192 kHz) |
| General | |
| SD Card Slot | 1x microSD slot (for firmware updates) |
| Compatibility | Windows: XP (SP2 or later), Vista, 7, 8 Mac: OS X 10.6 or later |
| Power | USB bus powered |
| Power Consumption | 2.5 W |
| Dimensions (W x H x D) | 4 x 1 x 6" (113 x 34 x 155 mm), excluding protruded parts |
| Weight | 17 oz (500 g), approximate |
| Packaging Info | |
| Package Weight | 1.7 lb |
| Box Dimensions (LxWxH) | 10.3 x 6.3 x 1.9" |
