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Particularly versatile, xDuoo's MH-02 is a tube preamplifier, headphone amplifier and USB DAC in one. Its preamplifier stage is equipped with a pair of 6J1 tubes for a warm, musical sound. The device's Class A buffer uses transistors to deliver high power output and greater sonic precision and dynamics. The MH-02 is thus also capable of accompanying the vast majority of headphones, thanks to an output power of 1300mW at 32Ω and three headphone outputs in 3.5mm jack, 4.4mm balanced jack and 6.35mm jack formats.
In addition to its stereo RCA input and output, the MH-02 features a USB-C digital input. This is associated with a CS43131 DAC chip capable of supporting high sampling rates, up to PCM 32bit 384kHz and DSD256, while ensuring low noise levels.

| 1 | Jack 6.35mm headphone output | 
| 2 | Jack 4.4mm balanced headphone output | 
| 3 | Jack 3.5mm headphone output | 
| 4 | Volume control | 
| 5 | Gain selector | 
| 6 | AUX RCA input | 
| 7 | AUX RCA output | 
| 8 | USB-C input | 
| 9 | Power input | 
| 10 | Power switch | 
Technical characteristics
| Specifications | |
|---|---|
| Product type | Tube preamplifier Headphone amplifier DAC | 
| Inputs | 1x USB-C 1x Stereo RCA | 
| Outputs | 1x Stereo RCA 1x Jack 3.5mm single-ended headphone output 1x Jack 4.4mm balanced headphone output 1x Jack 6.35mm single-ended headphone output | 
| DAC chip | CS43131 | 
| Tubes | 2x 6J1 | 
| Supported sampling rates | PCM up to 32bit 384kHz DSD up to DSD256 | 
| Headphone output power | 1300mW @ 32Ω | 
| Frequency response | 10Hz - 60kHz (±0.5dB) | 
| Gain (switchable) | +12/18dB | 
| THD+N | ≤ 0.8% (1kHz, 32Ω) | 
| SNR | 118dB | 
| Crosstalk | ≥ 70dB | 
| General | |
|---|---|
| Supply voltage | 12VDC 2A (Jack 5.5 / 2.5mm) | 
| Dimensions | 12 x 7.8 x 4cm | 
| Weight | 350g | 
| Housing materials | Aluminum | 
| color | Gray | 
| Package | 1x xDuoo MH-02 1x 12V power adapter 1x USB-C to USB-A 1m cable | 
| Input | RCA | 
| Input | USB | 
| Output | Jack 3.5mm | 
| Output | Jack 4.4mm | 
| Output | Jack 6.35mm | 
| DAC / ADC Chip | CS43131 | 
| Max sampling rate | 384kHz | 
| Max sampling rate | DSD256 | 
| Color | Gray | 
| Class | N/A | 
| Networking | No | 
| Remote Control | No |