STEREO:
Turn the speakers on, connect to either, then press the bluetooth button for 5 seconds on each to pair them in Dual Sound. They will be in mono mode meaning they'll both play back the exact same thing.
You can toggle them to stereo mode (I cannot fathom why this information is nowhere to be found in any manual or material) by playing something and pressing the play button on one of the speakers for 5 seconds. You will hear the speaker get a bit less loud and the LED will blink. This speaker is now in stereo mode and will be assigned to the R side. Press the play button on the other speaker for 5 seconds as well which becomes the L side. In stereo mode there is a ~4 second delay when you start playing something, and then it works fine.
If you turn the speakers off you must repeat the process again to get to stereo mode.
This has been tested on a pair of Onyx Studio 6s, my understanding is that it works on 5th gen speakers as well even between a 5 and a 6.
Quick Start Guide
Other
Product Specifications
General Specifications
Support
A2DP 1.3, AVRCP 1.6
Transducers
Woofer 1 x 120mm, Tweeter 1 x 25mm
Rated Power
1 x 50W RMS Bi-amp (AC mode)
Audio Specifications
Dimensions
Control and Connection Specifications
Battery
Striking design meets superior sound
With its signature round silhouette, premium fabric cover and aluminum handle for easy portability, the Harman Kardon Onyx Studio 6’s combines style and convenience in a sophisticated and refined Bluetooth speaker. It features an IPX7 waterproof design to use at any place within the home without worrying. Offering up to 8 hours of playtime on a single charge and wireless dual sound, it can wirelessly connect two Harman Kardon Onyx Studio 6 speakers to elevate music listening experience. With its iconic yet subtle design, the Harman Kardon Onyx Studio 6 is the ideal complement of any interior.
Wireless Bluetooth StreamingUp to 8 hours of playtimeIPX7 WaterproofWireless Dual SoundPremium MaterialsIntegrated aluminum handle
Buttons unresponsive when plugged into a power source
If the buttons on your portable speaker are not working properly or are unresponsive while plugged into a power source, please try running the speaker on battery. If the buttons perform correctly while running on battery, this means your power supply is not providing enough current/amps. Be sure to use a power supply that has a rating equal to or greater than the amperage rating indicated in your product specs.
Buttons unresponsive when plugged into a power source
If the buttons on your portable speaker are not working properly or are unresponsive while plugged into a power source, please try running the speaker on battery. If the buttons perform correctly while running on battery, this means your power supply is not providing enough current/amps. Be sure to use a power supply that has a rating equal to or greater than the amperage rating indicated in your product specs.