I have the old soundlink mini2. It will connect to the Ibasso DAP by bluetooth, but there's no sound. In the detailed settings on the Ibasso I can connect for phone calls or contacts, but there's no option for audio. The iBasso has BT 5, and I've read it's backwards compatible with BT4.2 but don't know if it goes back any further. Could this be the problem? What level of BT does the soundlink mini 2 have?