xDuoo MU-603 Bluetooth DAC/Tube Preamplifier


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Warm and wireless

With a Bluetooth 5.1 receiver chip that lets you control your music from your phone and a 12AU7 tube that gives you that warm tube sound, the xDuoo MU-603 is a DAC/Preamplifier that offers the best of both digital and analog worlds. 

Bluetooth 5.1

Get high-def sound quality with Qualcomm’s QCC3034 Bluetooth 5.1 chip. With fast and stable connections, it supports audio codecs like AAC, SBC, aptX, and aptX HD.

12AU7 tube

The sound is processed by a 12AU7 tube, which pares back some of the shrillness of the upper-end and boosts the mids for an overall warmer “analog” sound. 

Go wireless with your bookshelf speakers

Connect the MU-603 to your bookshelf or floor speakers for a convenient Bluetooth experience. Control the music from your phone, tablet, or other wireless device. Additionally, the MU-603’s preamplifier function will give your speakers the benefits of tube preamplification, like a warmer sound signature. 

Reference-grade DAC chip

Rediscover your library with the ESS ES9018K2M SABRE Reference DAC chip. This high-performance, stereo D/A converter uses the Hyperstream II DAC architecture and Time Domain Jitter Eliminator for performance that will satisfy even the most demanding of audiophiles.

Gold-plated RCA ports

The RCA ports are plated in highly-conductive gold. Unlike silver and copper, which corrode in the open air, gold doesn’t oxidize, making it an ideal material for audio connectors.

Aluminum alloy chassis

The MU-603’s chassis is created by CNC machining, a computerized manufacturing process that achieves incredible precision. Made of aluminum alloy, the chassis resists external electronic interference to keep you hearing your music and nothing but your music.

Product highlights

  • Bluetooth 5.1
  • 12AU7 tube
  • Preamplifier
  • ESS ES9018K2M DAC chip
  • Aluminum chassis
  • Gold-plated RCA ports


  • Power input: DC 12V/2A
  • Bluetooth version: 5.1
  • Supported formats: SBC, AAC, aptX, aptX HD
  • Maximum Bluetooth connectivity range: Around 32’
  • THD+N: 0.01%
  • SNR: 100dB
  • Output level: 2V
  • Size: 4.7 x 3 x 1.5” (12 x 7.8 x 4cm)
  • Weight: 0.77lbs (0.35kg)

What’s included

  • xDuoo MU-603
  • AC cable
  • Power adapter
  • Bluetooth antenna
  • User manual 
  • Warranty card

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