15.4 update low volume not resolved in Arc

Not having this issue on either of my two Arcs. Both are connected via ARC to Vizio TVs using the Sonos cable, the TV’s are being fed by Apple TVs. 

I just updated my whole set (Arc+2 One’s and Sub) to 15.4 and experience less bass output to the sub. I’m not amused because this seems like a dajavu to me. I already had an issue with that like many others and now it’s again after an update that de bass of the subwoofer is affected. What is going on Sonos?!!!

Yes sonos  has had  low volume  along with other  sound  problems for some  time .

When they do a fix update effects  something else ,this is poor  management of quality control that should be addressed  prior  to  release   

All  Sonos customers liked the  product to  buy it and paid good  money for equipment  that should  live  up to what is advertised an not  continued technical problems lasting years .

Please Sonos do  right thing clear  board  of all  your  problems , to maintain your leadership  in this  field  of  Sound  Technology .

Waiting for Mr. Peter Pee review before updates get installed here

My Arc/Sub/300’s all sound worse since the update.  More shallow sounding.  I wish I returned the 300’s as the One’s were just all around better, but I had faith Sonos would get it right and my whole system is now worse since today’s update.  

Sonos are you actually testing this before releasing to the public.  For the money spent, should be flawless and all around better with the 300’s over the One’s.  

Have the same problem with 15.3 and now 15.4; however, I have isolated it to my Era 300’s. If I remove them as surrounds the Arc’s volume returns to normal and sounds great. When I add them back the Arc’s volume is significantly dampened/muted.

I never thought that 15.4 would lower the volume even more than 15.3 did after updating.

Is trueplay required after this update?

Ok, I tried playing the same car and motorcycle chase clip from the intro to John Wick II over and over on 4K Blu-ray switching back and forth between Spanish 5.1 Dolby Digital and English Dolby Atmos and now the Atmos track seems to be performing fine with the new 15.4. I also noticed the image above in my app after doing this test. Odd time to show up. I will continue to monitor and post back if it changes again. Oh and I have not run TruePlay, instead I’m using Peter Pee’s best settings for 15.3 https://www.youtube.com/watch?v=qo2Q06FquTI&t=1s

I have exactly the same problem since 15.3 so this still not solved is 15.4 I guess. Since April 28th talking to Sonos support about this issue. This problem occurred since the release of new Sonos speakers and has effect on certain Sonos subs