Coincidentally Sonos made a new feature available a couple of weeks ago, called Zones. This seems to be what a you want. See 

Unfortunately it seems like it doesn’t work with Symfonisk (Ikea-Sonos) speakers.

it really sounds like a political decision to differentiate products and justify the higher priced products rather than a technical limitation.

In the end, it’s us, the users with 6+ Sonos products the ones that end up with a fractured solution.

if that is the case, it’s a pity.

I hope I’m wrong.

Can anyone confirm if it’s the case (Sonos ?)

I can guarantee you it was a technical limitation.  The resources available in the Symfonisk speakers are a lot less than what is available in the more modern Sonos speakers.  Also, if it were political, why would Sonos exclude many of its own products along with the Ikea speakers? 

In addition, Sonos has no history of excluding devices due to politics or driving sales.  Each time a new capability is implemented (S2, Airplay II, Sonos Voice, 2 Subs in a HT, etc), a certain segment of old and new devices has been included, and the cutoff of support for older devices can be easily explained by the lack of resources and/or hardware.  If they only wished to drive sales, Sonos would be excluding all older devices and just making the new functions available on currently sold products. 

I agree that is common practice to not include old products. That's absoulutelly common market practice.

I don't see as being the case. The Picture Frame speaker I have was released in 2023, whilst I have a Sonos one I bought it in early 2018.

The sonos one is supported for zones, but the Picture frame is not.

On top of that, we kind of can achieve the end fucntionality, but in a clumbsy way. I can manually select all speakers and then control all of them integrated form. it's clumbsy. I need to select 4 speakers manually instead of just clicking “Living Room”.

This really looks like it could be done with a aggregation layer in the APP itself (remember, I can achieve, in a clumbsy way, the integrated control). I'm definitively not convinced of this “technical limitation”.

When you think that a bookshelf Symfonisk is running for EUR 99, whilst the Sonos ERA 100 is about EUR 280, things start to make sense.

Either way. disapointing.

And the fact that a EUR 99 device may not have as many resources as a EUR 280 device doesn’t enter the picture at all?  Never mind the fact that any smart company would be trying to add a feature set to as many devices as possible to drive sales to more households makes far more sense than driving sales by excluding those devices, unless there is some technical limitation preventing it (which also happens to reflect Sonos’ history).

Wouldn’t the picture enter the picture frame speaker? 

Anything entering the picture frame speaker would surely void the warranty.

​@BernardoFortes 

Try creating a Group that contains the speakers you want. Once done the Group is always available. You can still select speakers in the group individually when you only want that one particular speaker. *

1. Tap the “Cog Wheel” ⚙ in the upper left corner of the Sonos app
2. Scroll down to “Groups”
3. Select “Create a Group”
4. Select the Rooms/Speakers you want in the Group
5. Name the Group
6. Click Save

To Acess the Group

1. Locate the “Playing Now” at the bottom of the Home Page of the Sonos app
2. Tap the “Speaker iCon” to the left of the Play Arrow 
3. You’ll see your Group at the top of the screen
4. Select your Group 
5. Select your Music; if not already selected 
6. Tap Play
7. Enjoy your Sonos

 * Room/Speaker in this post are synonymous

Incidentally, ​@106rallye response to ​@BernardoFortes doesn’t apply to my post regarding creating a Group. Unfortunately the timing of the response can be a bit misleading at first glance.