Arc Mids and Highs Poor and low volume

What audio are you getting from the Arc? Stereo PCM? Dolby Digital Plus? Dolby Atmos? What content are you testing and from what source?

@GuitarSuperstar , I have tried with the following formats:

Dolby Atmos

Dolby Multichannel - PCM

Apple Music (Spatial too)

Content is from my Samsung TU8000 equipped with an Earc port. All applications are installed in the TV and its a simple connection from TV to Soundbar via EARC using HDMI Cable provided with Arc(Apps like Netflix, Youtube, Disney and Prime). I have tested with Music Airplay as well, however, I do see the Arc lacking in mids and highs. Dialogues are not as crisp, turning on speech enhancement makes a difference but when doing Airplay, you cannot turn that on too. The volume on the Arc is Feeble/weak as compared to Bose Soundbar 700 which has a very good high frequency profile. 

I have tried to do Trueplay with 2 different devices:

Iphone 12 ProMax - Tested by Peter Pee to have the best Trueplay capabilites

Can I ask how big is your room? My living area is decent big. But IMO, the dialogues and Treble sound off. There are a lot of customers reporting similar issues, you might wanna have a look at this:

So, definitely, I am not the only one complaining. I might wanna say that you are fortunate to have this equipment sounding good but can I ask if you have demoed a Senhiesser Ambeo or Bose 700 soundbar? I used Bose 700 soundbar and boy, it does sound crisp obviously with less bass. So, the low volume and crispness definitely needs to be improved as you have to make the volume quite high to get just about average decibels of loudness. I have heard from a few that this happened after the last update, so may be it is something that @Sonos would want to fix in a future update. This article is to add traction to customers like us who are unfortunately facing this issue. 

Same problem on AMP: 

On the amp it seems to mostly affect music and stereo sources. I notice a huge difference in volume and frequency response between Apple Music on AirPlay/Sonos app vs on an Apple TV connected via HDMI. It’s like they’ve tweaked music/stereo sources and introduced some sort of normalisation/compression that ruins treble, dynamic range and separation.

 My floor standing Wharfdale speakers now sound much worse than my rear Symfonisk speakers!

I hate that people think it is just one user fault. I am completely in your situation where the dialogue was fine at first but then it seemed to drop off. I have my Arc connected to the eARC port and I am receiving LPCM 5.1. It is like Sonos struggles to balance the dialogue out. I have done Trueplay multiple times and seem to not have nay improvement what so ever. This is an issue that I have seen on other forums but no one seems to have an answer on how to fix it. Quite unfortunate given how much this soundbar is for it to be a let down in probably the biggest department. 

(cross posting out of frustration)
Adding a vote. Been following these threads for months (this community, reddit, and others) and have tried it all, including doubling down and adding the sub and ones to my arc, but still not satisfied with the dialogue quality at all. 
 

There’s obviously something wrong and I’m finding it hard to believe Sonos has still not resolved the issue or provided much of an update. (Maybe it’s something they can’t fix??)
 

I’m seriously regretting the purchase and cannot recommend Sonos at this point. 
 

im sure there’s many more people that are not posting as so many others (thousands) are already writing about the same - if that’s you, I encourage you to post. Again, hard to believe that Sonos doesn’t understand the severity of the issue at this point, but let’s at least make sure they understand the scale of dissatisfied customers.