Fosi Audio GR40 Tube Preamplifier with Stereo Headphone Home for Active Digital to Analog Audio Inputs DAC, Amplifier, 3.5mm Audio,

【Multifunctional DAC Preamplifier】The GR40 is a multifunctional vacuum tube DAC preamplifier and headphone amplifier integrated into one unit. It supports Bluetooth/USB/optical/coaxial input and active speaker/3.5mm headphone output, and features a headphone priority mode. 【High-Resolution Decoding】Equipped with the ES9028Q2M DAC chip, this preamplifier offers superior audio quality and flexibility. It supports USB sampling rates of 32-bit/384kHz and DSD256, achieving effective noise reduction and ensuring lossless audio at all times. 【Low-Latency Advanced Bluetooth】Equipped with a QCC3031 Bluetooth module, it supports aptX, aptX-HD, and aptX-LL codecs, providing detailed and clean audio sound. You can also enjoy a relaxed experience with low latency when watching movies. 【Compact and High-Functioning】With its compact form factor and preamplifier volume, bass, and treble controls, the stereo preamplifier produces a sweeter, more organic sound while maintaining the mid-range and high-frequency ranges that make up the music. 【User-Friendly Design】 The GR40 digital-to-analog audio converter is designed with user convenience as its top priority, allowing you to switch between various audio inputs and restore Bluetooth connectivity. It's a true plug-and-plug DAC preamplifier that requires no drivers. Please note: ① When installing vacuum tubes, use appropriate tools such as tweezers to adjust the shape of the pinholes in the sockets to ensure proper connection with the vacuum tube pins. ② If the left and right channels are unbalanced, reconnect the headphone cable, test with different headphones, or swap the left and right vacuum tubes to determine if a faulty tube is the cause. ③ Ensure the power socket is functioning correctly and the power plug is securely inserted, and use the power adapter included in the package. Fosi Audio GR40 Tube Preamplifier with DAC, Stereo Headphone Amplifier, 3.5mm Home Audio, for Active Speakers/Headphones, Digital to Analog Audio Converter, Preamplifier, Bluetooth/USB/OPT/COAX Inputs