Hello @Svein3. Spotify itself does not have a feature that allows you to set a device specific volume, unfortunately. Assuming that your speaker functions similar to my bluetooth speaker, then the only solution I can offer is opening Spotify, turning down the volume there, and then connecting to your speaker. I know this isn't ideal, but it's the best I can offer. I'll ask around and see if I can find something better for you though. Cheers!