Harman Kardon Onyx Studio 9

While it features a built-in rechargeable battery that provides up to eight hours of cordless playback and includes a handy power bank port to charge your phone, this speaker is built primarily for indoor spaces. It does not carry an official IP water or dust resistance rating due to its exposed rear connections, so it should be kept away from pools or sudden rain. Sonically, the speaker is tuned to deliver an energetic, bass-heavy signature with a powerful punch in the lower frequencies, though this emphasis means the mid-range vocals can sometimes sound slightly recessed. Users can easily fine-tune this audio profile using a custom seven-band equalizer accessible through the companion smartphone app.