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HP-A4BL D/A Converter & Headphone Amplifier 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. Windows and Mac OS Compatibility We confirmed the compatibility with Windows 7 / 8 / 8.1 / 10 and Mac OSX(10.6 or later). Product Features: 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 High performance DAC (Barrbrown 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 Product Specifications: Input [USB] terminal Interface: USB 2.0 Hi Speed Sampling Frequencies: PCM 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz DSD 2.8MHz, 5.6MHz, 11.2MHz Quantization: 16bit, 24bit [Digital In] terminal Connector: Optical, Square Format: S/PDIF Sampling Frequencies: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz Quantization: 16bit, 24bit Output [PHONES BALANCED] terminal Connector: XLR (4-pin) Maximum output: 300mW or more (32 ohm) Load impedance: 16 - 600 ohm THD: less than 0.04% (at 1kHz) Frequency Response: 20Hz - 80kHz (+-3dB, 32 ohm, 100...