In this video I take a deep dive into the Harman Kardon Onyx Studio 9 Bluetooth speaker and cover everything you need to know before spending around $299/£229. I unbox it, go over what you get in the box, and talk about the design—because Harman Kardon really does nail that premium, minimalist look. The Onyx 9 has that refined circular body wrapped in fabric, plus the aluminum frame that works as both a handle and a stable base, and overall it feels polished and well put together. I also break down the key features and connectivity: automatic self-tuning (it calibrates itself when you power it on), Bluetooth 5.3, multipoint pairing, AUX input, and the new addition I’m genuinely happy to see—support in the Harman Kardon One app, including firmware updates and (with the latest firmware) a customizable EQ. I explain what Auracast is and why it’s a big deal for multi-speaker setups across brands. Then I run a full sound test and share my honest take: the Onyx Studio 9 sounds awesome, with deep, present, punchy bass and clear, crisp vocals. That said, if your priority is the best overall stereo balance and fullness, I still think the Onyx Studio 8 wins—while the Onyx 9 trades some stereo accuracy for a wider soundstage and better off-axis listening, plus newer tech for the future.