Fosi Audio GR40 Tube Preamplifier with DAC, Stereo Headphone Amplifier. 3.5mm, for Home Audio, Active Speakers/Headphones, Digital to

[Fosi Audio] GR40 Vacuum Tube Preamplifier with DAC, Stereo Headphone Amplifier, 3.5mm for Home Audio Active Speakers/Headphones, Digital to Analog Audio Converter, Preamplifier, Bluetooth/USB/OPT/COAX Input

・【Multifunctional DAC Preamplifier】 The GR40 is an all-in-one vacuum tube DAC preamplifier and headphone amplifier, supporting Bluetooth/USB/Optical/Coaxial input and active speaker/3.5mm headphone output, and features a headphone priority mode. ・【High-Resolution Decoding】 Equipped with an ES9028Q2M DAC chip, this preamplifier delivers excellent audio quality and flexibility. It supports USB sampling rates of 32Bit/384kHz and DSD256, effectively reducing noise to consistently ensure lossless audio. ・【Low-Latency Advanced Bluetooth】 Featuring a QCC3031 Bluetooth module, it supports aptX, aptX-HD, and aptX-LL codecs, providing detailed and clean audio sound. It also allows for a low-latency, relaxed experience when watching movies. ・【Compact and High-Performing】 The compact form factor combined with preamplifier volume, bass, and treble controls allows this stereo preamplifier to produce a sweeter, more organic sound while maintaining the mid and high-frequency ranges that make up music. ・【User-Friendly Design】 The GR40 digital-to-analog audio converter is designed with user convenience as a priority, allowing for easy switching between various audio inputs and Bluetooth reconnection. It’s a true plug-and-play DAC preamplifier – no drivers required. ・Caution: ① When installing the vacuum tube, use appropriate tools such as tweezers to adjust the shape of the pinholes in the socket to ensure proper connection with the vacuum tube pins. ② If the balance between the left and right channels is skewed, try reconnecting the headphone cable, using a different headphone to test, or swapping the left and right vacuum tubes to see if a faulty tube is the cause. ③ Ensure the power socket is functioning properly, the power plug is securely inserted, and use the power adapter included in the package.

【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction.

【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary.

【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device's requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product.

【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer.