I just got the sound core 2 after using the original sound core till the rubber was wearing off the buttons.
The music sound is great. The volume on a call, not so much. Its low. People can hear me fine, but the sound is very low on my end.
I have tried rebooting the phone (hard reset. Power completely off), adjusting the call volume in the phone settings. Adjusting the volume on the speaker (this adjusts the call volume).
So is there something I am missing, or should I return this one for a model that works better?