If you have another controller that has not yet been updated, I suggest that you refrain from updating that controller and that you disable automatic updates. You should also disable automatic updates in the App stores.

Until SONOS fixes this, you can use the older controllers to select Mono.

Thanks for the suggestions Buzz but I already knew that and held off updating the app on my iPad and wife’s iPhone.  It’s just disappointing that Sonos would remove such a basic and useful feature.  Hopefully they will add this back in the next update, it’s a deal killer for me.

Please tell me Sonos plans to fix this

Huge problem, agreed. Just realized that not only did the toggle go away but the amp was flipped to stereo during the update so I can’t revert. Need a fix

Yeah this basically kills outdoor setups. Bring the feature back. 

So dumb. New app is lame, no reason to update the old one. And yeah, dual mono disappeared…why? Like they had to remove something?!?!? ADD something useful! The app is not intuitive. It’s slower (by a LOT!). “Main menu” page is dumb. It was fiiiiiiiiiine. Update for the sake of an update that was totally unnecessary and is worse not better. 

The whole app experience has been disappointing. The upgrade forced me to update each device individually. 

And I’m in the same dilemma with Dual Mono -- what sense did it make to remove that? It’s not as if the app changed the way the device handled a load.

Just crap.

Luckily found an old phone that didn’t have auto updates applied to the old app loaded and connected AFTER I got all the stuff I have (that had been dropping out for WEEEEEEKS with no explanation from Sonos other than network BS - since it had been running unscathed for months) added back in. 
 

when I looked at the old phone, sure enough the amps were in stereo but was able to switch back and adjust. Now they are doing what I need them to but I just can’t “see” it on the new app. Unless tomorrow I wake up and look And they revert . 
 

only crummy thing is I can’t do ANYthing to the old phone / app (add services) cause it’ll force the update. 
 

soooooooooo. Great, but Sonos you’re blowing it. I’m an AV integrator with probably 100+ Sonos clients in systems from basic to elaborate (20+ ports / 10,000 sq-ft house distribution) and if their DEGRADED “updated upgrade” user experience starts to come back on us we won’t use going forward with Sonos products and in all likelihood start to systematically replace existing ones with C4 native or autonomic systems as both offer Spotify and Auto now has Apple Music natively. Honestly my only two reasons for using Sonos the past few years. 

Just came here to say the new app sucks balls. Give us Dual Mono back!

Add dual mono back please!! I bought Sonos amp because of the dual mono feature.

also your advertising on the Sonos amp still says stereo or dual mono

Yeah, my outdoor speakers need to run in mono mode to accommodate the zones I have set up, otherwise they sound terrible. The deck gets one channel and the patio gets another.

I talked with support yesterday. They claimed dual mono was a feature which would be returning as updates to the app were rolled out.

Happy to hear the feature will be returning. Here’s another vote to give it priority! This is an integral part of my business and every day adds hundreds of customers listening to shit audio, to be honest. Thanks for rushing this one :)

Is there any chance of an ETA on bringing the feature back? Thanks for monitoring these posts and keeping us informed.

Just finished installing 4 outdoor speakers and my brand new Sonos Amp…which I got specifically to run everything in dual mono mode. Of course my outdoor setup sounds really off due to the forced stereo image. Definitely NOT a good first impression for the new Amp. They can’t bring back this dual mono feature fast enough…

I have the same problem. Bought the amp because of dual moni feature and now this... Disappointed.... Never buying Sonos again!

I honestly can’t believe there is another huge mistake in this update. It’s like actual sabotage.

I am an OUTDOOR USER, and WHOLE HOME USER. I want your product managers to just think about that for a second. Can they see the problem? I’m not even going to explain why this matters. Lets me just say this - it sounds HORRIBLE.

Is this company run by Wiim project managers or something? Is this sabotage? Why are you actively destroying your product?

Agreed, the arbitrary removal of features that we’ve come to rely on is impacting our ability to recommend Sonos to clients. It’s creating a horrible customer experience, made worse by the Dual Mono issue not being addressed anywhere by Sonos.

I emailed the CEO and got an automated response that didn't make one mention of Dual Mono, despite that being my only concern in the email. I replied saying so, and have not got any response. The hold times are 70 minutes to get through to Support. No Chat is available.

The distributed home audio space is only becoming more competitive, Sonos should take better care. I hope they can get it together quickly.

So here I am just finishing setting up my outdoor system….and realizing that this isn’t working. Any ETA for the dual mono??

Sorry about your luck.  It’ll probably be a bit.

i just installed 4 Sonos amps yesterday and couldn’t believe of all things that they removed the mono option.  Crazy.

Anyone have a good work around? I have not had any problems with any of the updates until….right now 

I just installed a new system with 2 Sonos amps. I'm wondering if downgrading the system to s1 and using the s1 app would be a work around. Anyone know?

You would need to setup an old Sonos connect and then  start downgrading and adding new players.i still use s1 at my home and im an AV installer. Dual mono is still there in the s1.I really don’t understand something as important as dual mono being overlooked. 

I’ve not seen this problem in any of Sonos’ to do list (but could have missed it). You could try getting it on there by reporting it to Sonos, especially when you are a professional.

Thanks, glad to know it’s still there in the S1 app. I may pursue that.  Can you also confirm that even in dual mono mode, it’s still one zone control?  It such a bummer if so.  I intuitively thought with “dual” mono I’d be able to get control of those volumes separately.