The MT-604 from xDuoo is a headphone amplifier based on the use of 4 6J1 tubes to deliver a soft and warm sound. These tubes are associated with transistors for the Class A buffer, allowing to have a comfortable output power to accompany a great majority of the headphones of the market. This design allows to take advantage of both technologies: the musicality of the tubes and the great dynamics and precision of the transistors, while developing a power of 2000mW. The power supply stage is filtered with Rubycon filtering capacitors.

The amplifier also benefits from a balanced connection. We find stereo XLR and 4.4mm jack on the input and 4 pole XLR and 4.4mm jack on the output.

The MT-604 also offers an independent volume control for each channel. This function allows a better separation of the channels.