The D400EX uses two high-end AK4499EX DAC (digital-to-analogue converter) chips and an AKM AK4191 chip. First class performance with high quality circuitry and components. Attractive and versatile, the MQA-enabled D400 EX offers full connectivity and Bluetooth 5.0 reception with aptX HD and LDAC codecs, covering the vast majority of emerging needs.