Note: 1. The default vacuum tube model equipped on MC331 is 6J1 vacuum tube 2.If you need a power adapter, be sure to check that you have selected the version with power supply after placing your order! If you choose the ‘NO power Supply’ option for your order, we will not send you the power adapter! Fosi Audio MC331 2.0 Channel Bluetooth Stereo Integrated Amplifier with DAC, Mini Audio Power Amp for Passive Speaker Description All-in-One DAC Amp: A DAC, amplifier, preamplifier, and headphone amplifier are all integrated into the Fosi Audio MC331. You can easily switch between audio sources with the help of the remote control, ensuring a seamless and enriched listening experience Amazing Combination: As an integrated tube DAC amp with a VU meter, the visual aesthetics of the 5654W vacuum tubes and VU meter add a nice warm and soft effect to not only the appearance but the sound as well, giving the modern look a retro feel Setup Flexibility: It supports Bluetooth, USB, coaxial, optical, and RCA inputs, making it compatible with a variety of sources such as computers, phones, CD players, turntables with built-in phono preamps, etc., allowing you to build various systems Compact Yet Powerful: The MC331 only takes up minimal desktop space but boasts a maximum power output of 105W x2@4Ω, effectively driving your bookshelf speakers. Additionally, it has a pre-out and a 3.5mm headphone output, making it versatile enough User-Friendly Design: The MC331 comes with a remote control, allowing you to adjust bass and treble from the comfort of your listening chair. Its replaceable tube design lets you customize the sound signature to suit your personal preferences Feature Channel：2.0 Input：RCA, Bluetooth, USB, Optical, Coaxial Output：Passive Speakers Output, Pre-Out, 3.5mm Headphone Output Amplifier Chip：TPA3221 SNR：≥100dB Dynamic Range：≥100dB THD：≤0.03% Terminal Impedance:4-8Ω Max Output Power:105W×2@4Ω Frequency Response:20Hz-20kHz(±1dB) Headphone Impedance:32-300Ω Voltage Range:DC 19-24V Sampling Rate:USB: 16bit/48kHz Bluetooth Connection Distance:≥10m Bluetooth Audio Transmission Format:SBC, AAC Include MC331 Amplifie 6J1 Vacuum Tube*2 Bluetooth Antenna Tube Cover*2 Remote Control 24V/4.5A Power Supply Unit User Manual QA Q1:Which tube models are compatible with the MC331? The following tube models are compatible: EF95, 6AK5, 6AK5W, 403A/403B, 6J1, 6J1P, 6J2, 6J3, 6J4, 6J5, among others. You can test and choose based on your personal preference. Note: When replacing tubes, ensure that the MC331 is powered off and that the tubes have cooled down to avoid burns or damage to the product. Q2：How long does it take for the MC331 vacuum tube to warm up? Please make sure to allow about 15 seconds of warm-up time for the tubes before starting playback. Q3: Which is the power adapter that fits the Fosi Audio MC331? The MC331 is compatible with a 19–24V power supply. You can choose a power supply within this range.

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