The sound through the Bluetooth on my tablet is currently unusable. I've tried to use my wireless headphones and a Bose Soundlink through Bluetooth and the sound is very crackly and breaks up constantly. I don't have this problem when using my phone with these devices via Bluetooth.
My tablet is the Tab2 SM-T810 with Android 7.0. I've only started experiencing this problem but didn't use Bluetooth much in the past so I'm not sure if it's a new problem or not. I'm sure I would have noticed it previously with the Bose though I tend to use my phone.
The sound on my tablet is fine when I play through the speakers.