How can I adjust the left/right balance of my two SoundCore Mini?
Once you pair both the Soundcore Mini together Or pair Soundcore Mini with another Bluetooth speaker (Soundcore mini supports pairing BT speaker), then with the single source such as BT smartphone, play the audio. Smartphone audio output should then provide the balance for Left / Right.
This should be possible on Androids, will give it a try on iphone and post if its possible
The balance should be made on the device, not possible at the speakers.