In addition to retaining all the original functions, ST-01 PRO is the latest upgraded version of ST-01:
1. ST-01 PRO supports U-disk input to play lossless formats music.
2. Add sensitivity adjustment of VU meter on its bottom, easy to set and match better with different input signals.
3. Add three decorative golden circles around tubes and VU meter, looks more exquisite and luxury.

Features

• Unique and amazing combination: integrated ST-01 PRO amplifier with VU meter into whole in such a mini size, the pointer dancing in the warm light with strong vintage feelings when enjoy HiFi music, dynamically decorates the audio system space. 

• 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 one's own preferable sound styles, presents HiFi music with rousing highs and deep lows.

• Strong output power and special AUX output: use TI's classic power amp IC, each channel can output 100W(4Ω) and easily to drive all 3-8Ω passive speakers, adds 3.5mm AUX output easy to connect another amplifier or active speaker / subwoofer to build multiple channel system and enjoy wonderful home theater experience.

• 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. 

• Practical functions to simplify use: with full-function remote control, all settings can be achieved from the distance; 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.

Parameters

• Brand: Douk Audio
  
• Model: ST-01 PRO
  
• Audio input: Bluetooth / USB (PC-USB) / Coaxial / Optical / RCA / U-disk
  
• Audio output: Banana speaker jacks / 3.5mm AUX
  
• Max output power: 100W+100W (4Ω)
  
• Matched impedance: 3-8Ω
  
• Sampling rate supported:
  USB input: 96KHz/24Bit
  Bluetooth input: 48KHz/24Bit
  COAX/OPT inputs: 192KHz/24Bit    
  
• Supported formats of U-disk: MP3 / WAV / WMA / FLAC / APE
• Max capacity of U-disk: 64G
• Treble / Bass adjustment range: ±6dB
  
• System PC-USB supported: XP/W7/W8/W10/MAC/ Linux
  
• Frequency response: 20Hz-20kHz(±1dB)    
  
• S/N ratio: ≥98dB
  
• THD: 0.07%
  
• Working voltage: DC 18-30V
  
• Dimensions(W*D*H): 115*98*54mm / 4.53*3.86*2.13in
  
• Package dimensions(W*D*H): 295*225*85mm / 11.61*8.56*3.35in
• Net weight(ST-01 PRO): 661g / 1.46lb
• Package weight: 1.4kg / 3.09lb

Packing List

• 1*ST-01 PRO Amplifier
  
• 1*DC 24V Power Adapter (optional)
  
• 1*Remote Control (without 2*AAA batteries)
• 1*USB Cable
• 1*Bluetooth Antenna
  
• 1*User Manual