changing volume on grouped speakers

Not sure I understand the difficulty. You’d just group the four speakers in a normal group. And then adjust that group’s volume. The Move’s can’t be used as surrounds, so that group wouldn’t include the Arc. You’d just not want to include the Arc in that group (don’t use ‘everywhere), and the group’s volume controls in the controller will just change the one group of speakers. 

Thanks Stanley.  Yes, that is exactly the issue.  Unfortunate that the Sonos app doesnt support this feature.   You cant group portable speakers independently from another group/zone and then adjust the group volume as you please.  Its either everything together, or all individually. Bummer

Still that is an interesting idea, maybe Sonos will pick it up as a feature request.

If I understand you right, you are using the group function to get the portable speakers to play the sound of the Arc, but want to only change the volume on the portable speakers, not the Arc. A group within a group, so to say?

Yes.  I guess that is correct.   I have the arc (inside) and the portables (outside) all playing the same music.   And I want to change the volume of the outside speakers only... as a group.   

Ah, there was nothing in the original post that suggested to me the Arc was included. There is no easy way to change the volume of a subset of rooms that are grouped. You’d have to do them individually. 

Not what you want but change the Group volume to where the outside speakers are good then individually change the Arc.

Can you set up the Move 2’s as a group, say called Outside, on your wifi network? Then group Outside with the Arc. When you tap on the volume bar, two volume sliders should appear: adjusting Outside won’t affect the Arc volume. 

Interesting.   Not sure how to do that though.   Any additional advice?