Very strange issue. I had the same and also connecting external BT receivers helps.

Do you know why we have this issue and if it can be solved somehow on the firmware level or operating system level? Is this connected to the power problems somehow?

I have tried connecting small 1.8mm, 8Ohm speakers (http://www.tme.eu/pl/Document/4eae1f9a06a05092eced4b962c9f9085/ld-sp-um18_8a.pdf) directly to pi audio output and it is hardly noticeable that anything is playing. If you want to have something really small and chip and you are not afraid of build ...

Thanks for your answers. I put raspberry in small DIY project so buying something ready to use is not an option for me, but probably it is the best choice in most cases. I will go for direct passive connection of speakers to audiojack if it works. If sound would be unacceptable, I will use some inte...

Could you please suggest if it is possible to wire 8Ohms / 0.5W speakers directly to this jack? I understand that it will not be very efficient but I don't need that. Do you know if it will be hearable from 4/5m in quiet room. I would like to use to play audiobook for children. Specification of the ...