< GO BACK Hands On: $5,750 BluOS-based DALI CALLISTO System Redefines Wireless Posted on December 19, 2018 · DALI CALLISTO Hub – The DALI CALLISTO central hub features a minimalist front-panel dominated by a large volume knob and volume level indicator. Posted in: News Tagged with: Apple, BluOS, MQA, Pandora, Review, TIDAL, Wireless Audio