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Hello. A few months ago I bought a Sonos Arc Ultra, 2 Era 300s and two Sub 4s. It's working on an 85" TCL TV connected to an Apple TV 4K. The audio quality is spectacular. However, I'm having two problems:

When I leave the system off for 10 minutes, when I turn it back on, the sound takes about 5 seconds to be heard. It's as if the amplifiers are turned off and only turn on after receiving a signal via HDMI.

The other problem is the lack of volume under certain conditions. I've done extensive research online, and absolutely everything in the TV and Apple TV setup is in line with what's needed to get the best results. I've also tried TruePlay in various ways. Few content can be heard satisfactorily in terms of volume without using at least 70%.
For comparison, I also have a Bose 600 + 5" subwoofer, and the volume of both systems is very similar, perhaps a little louder with the Bose.

I've tried using the Apple TV output only, but the volume results are the same. An excellent example is the video titled "Erick Clapton - Layla | The Lady In The Balcony: Lockdown" on YouTube.
Finally, I live in Brazil and bought this system in the US, which doesn't make it any easier to know if the system is actually like that or if there's a problem with mine.

The Sonos go into low power mode after a few minutes, mine seem to wake fairly quickly. It might be that the Sonos and your TV are taking a bit of time to handshake adding to that necessary delay.

As to volume make sure you have no Sonos volume limit set, other than that the volume setting on the Sonos should be able to enable full volume. Keep in mind the numbers shown are only to make it easier for you to set them to a desired volume and are otherwise meaningless. 

 My TVs have no internal volume control when set to pass the audio to my Sonos, you might confirm that applies to your TV too.


Room physics has a significant impact on subwoofer effectiveness. Moving one or both SUB’s will have an impact that will be positive or negative.


The Sonos go into low power mode after a few minutes, mine seem to wake fairly quickly. It might be that the Sonos and your TV are taking a bit of time to handshake adding to that necessary delay.

As to volume make sure you have no Sonos volume limit set, other than that the volume setting on the Sonos should be able to enable full volume. Keep in mind the numbers shown are only to make it easier for you to set them to a desired volume and are otherwise meaningless. 

 My TVs have no internal volume control when set to pass the audio to my Sonos, you might confirm that applies to your TV too.

Thank you.
Volume limit is off. For the song I sent an example I use it at 100% volume and you can talk normally.
And yes, my tv settings have the Pass Through ON.
I'm coming to the conclusion that the system doesn't actually offer enough power. Having practically the same volume as a Bose 600 with a 5" sub is almost disappointing. I just want to be 100% sure to deal with this.


Room physics has a significant impact on subwoofer effectiveness. Moving one or both SUB’s will have an impact that will be positive or negative.

Im happy with the subs. I use both bass settings at 0. I could add bass if I have more overall volume. For what I have now they are more than enough.


Mine also takes a few seconds to turn on, when I turn on the TV it takes 3-5 seconds before the sound is activated on my Ultra and thus the entire system.

As for the volume, there are many factors that come into play, when streaming movies from Apple TV 4K, I experience really good sound on Apple TV+, Disney+ and HBO, but on Viaplay the sound is terrible and here I have to turn it up quite a bit. In other words, the quality/volume depends on where you stream from. (Maybe SONOS is more sensitive than others)

With music there is also a big difference, the same applies here, but there are also other things that come into play. Where do you stream from, your phone, Apple TV or the TV itself and how. Airplay is undoubtedly best over your phone as the sound is degraded by Bluetooth. Personally, I thought the sound was best when I stream directly from Apple TV.

There are also settings in your SONOS App that can improve the audio experience, especially by choosing Full or Background when playing music, and adjusting how loud your Era300s play. I have mine as Background with +2.

A funny thing I found out a few days ago is that if you turn off speech enhancement, music plays much louder from your Arc Ultra.


Might be time to play from Apple TV for 15 minutes, then submit a diagnostic and call Sonos support,  they can see internal data we users can't see. 


Mine also takes a few seconds to turn on, when I turn on the TV it takes 3-5 seconds before the sound is activated on my Ultra and thus the entire system.

As for the volume, there are many factors that come into play, when streaming movies from Apple TV 4K, I experience really good sound on Apple TV+, Disney+ and HBO, but on Viaplay the sound is terrible and here I have to turn it up quite a bit. In other words, the quality/volume depends on where you stream from. (Maybe SONOS is more sensitive than others)

With music there is also a big difference, the same applies here, but there are also other things that come into play. Where do you stream from, your phone, Apple TV or the TV itself and how. Airplay is undoubtedly best over your phone as the sound is degraded by Bluetooth. Personally, I thought the sound was best when I stream directly from Apple TV.

There are also settings in your SONOS App that can improve the audio experience, especially by choosing Full or Background when playing music, and adjusting how loud your Era300s play. I have mine as Background with +2.

A funny thing I found out a few days ago is that if you turn off speech enhancement, music plays much louder from your Arc Ultra.

I only use HDMI.
I also use my Era 300s at -2 and full.
Speech enhancement always off.
The system unfortunately is weak in power for most sources (this is my conclusion). When paying Atmos content listening to Apple Music is “enough”.


Might be time to play from Apple TV for 15 minutes, then submit a diagnostic and call Sonos support,  they can see internal data we users can't see. 

Didnt know this could be done.