Can you check that Loudness is not Enabled within the EQ settings for the Beam, in the Sonos App.

I tried turning off the loudness and it did not help.

Added a sub gen 3 as well. No change

Two things to check: are the speakers on a soft surface or correct floor/wall mount; can you check your TV audio settings and ensure that it is set to pass through.

How have you connected your devices?

My tv and beam are wall mounted. Sonos sub gen3 is on floor. Surrounds are on stand. Tried changing output from dolby digital plus to dolby digital. And tried other settings and no change.

where as netflix/prime/hbo max (dolby digital 5.1) content plays well from firestick. But I miss the tv display clarity!

Just had a look at the manual for your TV, have you tried changing any of these settings:

Sound

Adjust settings by input such as the TV or HDMI, and other common settings, to enjoy various sound effects.
You can configure settings such as those below.

ClearAudio+

Achieves the best sound quality by applying a well‑balanced combination of digital signal processing technologies. Disable this setting when outputting audio from both the TV and audio system through digital audio output.

Sound mode

Select modes such as Cinema] or Music] based on your environment and preferences.

Sound customization

Adjust sound settings related to each sound mode.

Volume level

Adjust the sound level of current input.

Advanced auto volume

Keeps the volume level constant for all programs and inputs.

Balance

Adjust the speaker balance.

TV position

Output sound from the TV speakers according to the position of the TV.

Reset

Return all sound settings to factory default settings.

Tried all of them.