Is it possible to set Phantom Golds to standard speakers on my laptop?

[Limtre]

I already use two chromecast, one in the TV and one on the bathroom speaker.
In the beginning it worked like a charm, but it has become more and more unstable.

Unfortunate to hear. Have you tried a full factory reset of the Phantoms and the Dialog? Normally it cures optical hiccups.

It's not the Phantoms, they work like a dream, but both of the chromecasts started acting up after a while, so I don't want to include dem in my setup with the Phantoms :-)