Hi @sweslac, in addition to what @djupsjob said, the best way is to directly connect your source device (i.e. Chromecast) to your Bluetooth speakers. This is the only way to also ensure no audio video sync issues. However I don’t think Chromecast has this feature.
Do you have the option of using a Fire TV stick? Amazon Fire TV supports Bluetooth connection to your speakers so you will be able to use the PicoPix Max for video and your BT speaker for audio. I have this setup and it works perfectly.
Another alternative is to get a BT transmitter and plug it into the 3.5mm audio jack at the back of the projector, and transmit audio that way.
Finally the 3rd and even simpler solution is to get an FM transmitter and plug it into the 3.5 mm jack.
Hi @Zoub an FM transmitter just creates a “radio station” on an FM frequency, so you can use any radio tuner to play back the audio wirelessly. There is no pairing and no delay, audio/video will always be in sync. Since it’s just a broadcast you can also use as many headphones or speakers as you like. We had for example someone who created a drive-in theatre where every car played the movie’s audio on their sound system.
Whatever you plug into the 3.5mm jack will only send 2 channels / stereo. Sending this to a 5.1 home cinema sound system would be a waste of a perfectly good sound system. Thou BT seems not to be able to handle more that 2 channels anyway. Consider having an optical audio output on the next version of the PicoPix. I am forced to buy a HDMI to HDMI + audio converter, hopefully that will work.