I have done the steps which includes submitting diagnosis report now. I used Spotify app to play music via wifi and room name is "Sonos Living room"

Thanks in advance 

Hi ​@savadgan 

Got them! Thank you!

I too am having this issue as I believe many others as indicated in the thread below:
https://www.reddit.com/r/sonos/comments/1knubrv/spotify_connect_vs_sonos_app_there_is_a/

This began occurring several weeks ago. BLUF: when playing music from Spotify Connect to Sonos speaker(s), the volume is significantly lower, appears muffled, and overall lesser quality. However, when playing identical songs directly from Sonos from the same Spotify playlist, the volume is what it should be; clear, louder and better quality. 
 

Sonos and/or Spotify should really invest some effort into resolving this. It shouldn’t be on the customer to deal with diagnostics and scower the internet for solutions. Consumers are paying big money for speakers and streaming services and they should be delivering on top notch audio quality.  It’s a PIA dealing with support these days and having to come onto a forum is such a buzz kill. 
 

What does BLUF: mean?

I have the same issue. Started a couple-few weeks ago after an automatic system update. I spent a couple hours on the phone with support but no luck   Definitely an issue with the Spotify interface also Amazon music.  Only Sonos music works    Big disappointment as it’s not just the volume issue but a significant sound quality degradation as well. I’ve better sound from my car radio now

That’s really odd. Sonos uses the same code/player for all streams coming in, so any changes to just Spotify would have to be at the source server, i.e. Spotify’s servers. Have you contacted them about this issue?

Hi all,

I've been experiencing the same problem for a few weeks but I can't say if it coincides with an update of the Sonos system, which is set to auto at home, but it could correspond to the release of version 85.0-64200 in early May.
I was using Spotify Connect and noticed a drop in volume, a loss of clarity and impact.

3 days ago, I randomly tested Spotify streaming via AirPlay 2 and, miraculously, the sound came back the way I like it. This is a start to a solution that isn't perfect for me due to the latency of the commands via AirPlay, but it allows me to wait for Spotify Connect to return to normal operation. I also point out that the sound is good via the Sonos app.

My Sonos system: arc ultra, sub4, era300 x2.

Thanks to the Sonos team for taking care of the problem.

After today's update I can confirm that the volume difference between Spotify Connect and Spotify in Sonos app continues.

Do you have any updates on the analysis of this issue?

Hi ​@kdth_jhspk69 

No update news, and it’s unlikely that there will be - we will likely not hear about it again until it has been resolved.

Today’s update was likely already planned and scheduled for release before this issue was even reported.

Hi, FWIW I came across this post when searching for information about this, and I’ve been experiencing this as well .. pair of Move 2s and a Sonos 5 both. 

Same here. On 4 Sonos Ones, a Beam and an Arc. The difference between Spotify connect and Spotify via Sonos app is roughly 6 decibels measured @1m. Which is a LOT.

Experiencing the same issue as well on the sonos arc ultra paired with ERA 100s as surround. 

I have the same issue on all my sonos devices... 

I have also noticed when watching Prime video also encountered bass softer,, consider auto tuning if problem still face soon.

I'm surprised this issue wasn't addressed in the latest software update, especially given how many users have reported it. Hopefully, it will be resolved in the next release.

We all tend to assume that our feature desire or error/awkwardness discovery should be the center of the universe with respect to implementation/resolution. Unfortunately, this is not the way large development teams tend to function. The request must go up the marketing or support chain to the top for evaluation, and then down the development chain to get scheduled for implementation. I agree that it can be frustrating for users.

I recall a very different experience with a different program a few years ago. The program was a single developer’s product. At 10:00am on a Sunday I sent the developer a note asking for a feature. 11:00am: “Why would you want to do that?” I justified my request. 1:00pm: “I’ll think about it”. 8:00pm: “Try this”. There was my feature. We tuned it over a couple weeks and it was released for general use soon after. It can be annoying at times, but a large team cannot respond this fast.

At least more and more of us are reporting the volume issue with Spotify Connect. So, I assume that sooner or later they’ll look into it and give us a solution.

Agreed, personally I think when using spotify connect the music sounds low quality and unimpressive now. I think new customers/users would think sonos just makes bad speakers I don't think many people would know to initiate the playback from the app. 

Isn’t that how most people would play music on their Sonos speakers?

I personally never used sonos app prior to two months ago. Spotify connect was always easier to use and spotify app is better for navigating their own library it was also easy to change where you wanted music to play. I only tried the Sonos app when I noticed a notable drop in volume and qualify when using my system as I have done for the past 2 years.

I was able to set up system and stream music to all my devices using spotify connect and only used sonos to group rooms etc but once that was done you could connect to the system in multiple ways and it would sound great. 

Now that I have to use the sonos app I can see why people are upset about the S2 updates. When using spotify connect you basically bypass all the playback issues.

Basically being locked to Sonos app now if you are any type of audio enthusiast is a let down in flexibility.

Again hopefully this is a glitch and not intended by either Sonos or Spotify.

I noticed this issue right away after setting up my first Sonos device (Arc Ultra)

​@buzz Bruh- this is widespread. Take it easy with your passive aggressiveness. I shouldn’t have to provide diagnostics and videos and more info that everyone else has complained about. Just fix it please. People are annoyed. Sonos speakers aren’t anything revolutionary, audio-wise. They’re paying for the user interface and supposed ease of use. Otherwise, why don’t we just switch back to a different speaker system? Folks like myself have invested thousands into speakers from Sonos due to its user friendly aspects. This isn’t the case now. This is something that’s changed, so it’s not on the user to just accept that this is a byproduct of Sonos being part of a “big deployment or implementation.”  It’s been months now which is unacceptable. 

If you send diagnostics and call support, your issue will move up in the queue.

-Reference previous comment. Vendor support sucks these days. Maybe AI will fix it ;)

There’s already AI on the chat service, just not in the phone service, that I’m aware of.