The SMSL SU-9 family pairs an AK4499-based flagship DAC architecture (8-channel/dual-op-amp output stage) with balanced XLR outputs and Bluetooth (LDAC/UAT) support. Measurements show extremely high SINAD (~120 dB) and >4V output capability, giving class-leading noise/distortion performance and headroom for sensitive or power-hungry gear; buyer should expect audiophile-grade clarity but be aware of some UI and format-handling tradeoffs.
For desktop audiophiles wanting measured-class-leading DAC performance, balanced outputs, and Hi-Res Bluetooth; avoid if you need a polished, intuitive UI or full filter control with MQA.
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