An improved version of SMSL's popular SU-9 DAC (digital-to-analogue converter). The Pro model builds on the technical foundations of its predecessor, while incorporating new integrated components designed for higher performance. This new version incorporates a new ESS ES9039MPro DAC chip, which offers a high level of richness and precision in sound reproduction. It allows the playback of high resolution sounds up to PCM 32bit 768kHz and DSD512, as well as the decoding of MQA and MQA-CD.