in doubt of buying sub

Agreed, 100%. At first the Trueplay tuned bass may sound lean to those used to the bloated sound, but it takes just a couple of days to realise that lean is better here as well. I do have my Sub output after Trueplay set to +2 though.

The system is designed to be powered 24/7. After a couple minutes of no sound, a unit will switch into a low power mode, but there is still a little energy consumption because the unit remains active on the network.

One consideration of constantly powering down the units is that SONOS makes very sophisticated use of computer network resources. Unlike a simple web browser that typically communicates with a single remote site, the SONOS units are constantly chattering with each other and optimizing the communication paths between units. If a web page, chat, or email is occasionally delayed for a few milliseconds, no one will notice, but if music is delayed its a disaster. When one or more SONOS units are suddenly powered down, the SONOS network strategy must be re-worked and that silent unit might have been a critical link. In some respects is like attempting to change socks while running and you may bump into other runners while struggling.

You can minimize network chaos caused by constantly powering down the SONOS units by configuring your router to “reserve” addresses for all devices that regularly connect to the network. This is a one time chore -- repeated if you replace the router in the future. I know that legions of people will claim that they have not reserved addresses and never had any trouble, but they were accidentally lucky for those dozens or hundreds of times and when trouble finally strikes they make the incorrect assumption that something broke.

Deserves to be a sticky.

Thanks buzz I will leave mine on 

I set up true play and it has made a big difference the highs mid bass and low bass are in equal proportion my room is filled with quality sound thanks sonos your products are the best 

Just to keep the record straight, I’m not a SONOS employee, these are not “my” products. I and a few others just hang around here a bit more than most Community members.

“a bit more….” 

I’m laughing. Mostly at myself :)

I keep all our speakers on, regardless of network I believe the initial power on is the most dangerous time for the power supply boards.

As for the Sub, definitely money well spent!.

In my opinion, when electronics are most at risk is when there is a state change, so power on, firmware updates, power surges, anything that disturbs the status quo can be a point of failure, although rare in the majority of cases. 

Is the best way to set up sonos system 

Dining room 1 sonos5

Dining room 2 sonos 5 plus sub 

And when I turn sub on does it lower the bass frequency of both sonos 5s or just the one the sub is paired to