Product Descriptions:Features:1.Unique and amazing combination: integrated T9 amplifier with VU meter into whole in such a mini size, when enjoy HiFi music, the pointer dancing in the warm light with strong vintage feelings, dynamically decorates the audio system space.2.HiFi clear sound with tone control: resonable circuit and concise wiring, adopts vacuum tubes to soften the sound and filter out the digital feelings, sounds warm and sweet without noise. Also with treble and bass knobs to adjust ones own preferable sound styles, presents HiFi music with rousing highs and deep lows.3.Strong output power and low frequency output: use amp IC TPA3221, each channel can output 100W(4ohms), match perfectly and easily to drive all 3-8ohms passive speakers, adds a low frequency output easy to connect active speakers and build 2.1 channel system, the bass effects is greatly enhanced.4.With multiple digital audio inputs: Bluetooth 5.0 / USB / Coaxial / Optical / stereo RCA, compatible with most audio device such as phones, computers, tablets, TVs, TV, CD players etc. The perfect combination of DAC and amplifier, very suitale for audiophiles who have various audio devices.5.Practical funtions to simplify use: with input selection and indicators, clearly to show the working status in real time; aluminum alloy case is specially designed, cool and unique to decorate your desktop space.Product paramstes:Chipt: 6K4+TPA3221*2+AC6926C+SA9123+MS8412+NE5532Tube model: 6K4 x 2PCSReplaceable tubes: 6J1, 6J2, GE5654, 6J3, 6J4, 6J5, 6AK5, etc.Support: MP3/WMA/APE/FLAC/WAVpc-usb sampling rate: 24bit96khzOptical fiber/coaxial sampling rate: 24bit 192khzBluetooth sampling rate: 24bit 48khzpc-usb support system: XP/W7/W8/W10/MAC/LinuxTotal harmonic distortion: 0.07%Signal to noise ratio: >98dbFrequency response: 20-20Khz (+/-1db)Treble/bass adjustment range: +/-6dbSpeaker impedance: 3-8ohmsOutput power: 100W*2 4ohms loadInput mode: Bluetooth / RCA/pc-usb/optical/coaxialSupport equipment: mobile phones, tablets, computers, MP3, TV, etc.Output mode: passive speaker, active subwooferWorking power supply: DC18-30VSize: 115*98*54mmPackage included:1PCS Tube T9 tube amplifier + 1PCS US Power adapter