The xDuoo MU-603 12AU7 Tube Bluetooth 5.1 Aptx HD ES9018K2M Decoder Hi-Res Pre-Amp is a used device that combines analogue and digital features. With two channels and two outputs, this pre-amp is perfect for both home audio stereos and components. The device boasts Bluetooth 5.1 Aptx HD technology which enables high-quality wireless audio streaming. The ES9018K2M DAC chip guarantees the best quality audio, while the 12AU7 tube provides warm and natural sound.

The xDuoo MU-603 is a versatile device that can be used for various audio tasks. The device is grey in color and has a sleek design that fits well in any modern home audio setup. If you're looking for an affordable, high-quality Bluetooth DAC / preamp that can handle any audio task, the xDuoo MU-603 is an excellent choice.