Is there actually a manual or user guide?

Two things, I meant I’d turned off “loud” didnt have the app open at the time.  However, may have an answer below.

Success in linking and loading my music library.  Bad user error...first time I ever had to key in the name of the PC share (usually just select from a list) and there was a slight zero/O typo from me.  So all good there, nested folders good too.

Listening to first track Albinoni, and its quite trebley.  So re-upped the bass and reduced the treble, no change.

There seems to be a delay in updating the equaliser changes. Hoping I don't have to keep restarting for it to take effect.

Edit - Android here

Thanks for help so far.  Can’t wait till I try to install speaker two in the other room :) ! (mesh wifi) Maybe tomorrow...

The power switch on my Sony isn't a power switch, it just toggles active and standby modes.

I had to add an external power switch to actually power it down to trigger a reboot.

My Sony has back-panel control switches rather than under-the-screen, but again the “power” button doesn’t achieve disconnect from the mains. I think this is the case for most TV’s. To disconnect completely from the supply, they need to be unplugged. I’m sure your tv user manual will confirm this, ​@Curlew 

Installing second speaker and grouping them was a piece of cake!  Much easier than the first.  Things I’ve noted:

• The app tells you to press a button to pair with bluetooth….this not necessary, they pair anyway. (worrying?)
• Music servers: Sonos won’t search for broadcasted PCs, you have to fill in the address exactly. (a bit agricultural imo). Get this sorted and updated with all your recordings before adding the rest of your speaker group.
• If like me you have ensured your media server PC only has unimportant data and thus don’t usually demand a password for access, Sonos wants to use the PC sign on credentials, even though other kit doesn’t.
• As I read elsewhere on here, set up secondary speakers on the same mesh router/duberry and only move them to other rooms after installing & testing all working well.

Happy bunny

I think you mis-read the app instructions, and mis-understanding what you can do with Sonos speakers.
The stereo pairing is done for you, if you elect to run them as a stereo pair (not recommended if they’re physically in separate rooms).
You can Bluetooth-pair a device to a Sonos speaker or stereo-pair of speakers. 

You can group two or more Sonos speakers. 
You can play the Bluetooth-sourced sound to a group of Sonos speakers. 
 

Thanks ​@nik9669a 

I'm not stereo pairing them, I had two wired stereo speakers in each room before, Kefs and Goodmans - now decided my ears are past their sell by date, so the mono output is perfectly fine for me.  Sonos output is certainly better than mono output used to be back in the day.  Thin walls here too, so shift working neighbours not happy when I put my old speakers on (installed against the party wall).

One Marantz and four speakers heading for the loft.

There is button on the rear of the speaker to activate Bluetooth (BT). You may have pushed it inadvertently by mistake. At that point the speaker went into BT pairing mode and you made the connection. After the first paring when BT is active on the speaker your device will connect automatically if in range. You can prevent this in one of three (3) ways:

• Turn BT off on the speaker
• Disconnect from the Era 100 in the BT menu on your device  
• In the app set the speaker to automatically disconnect when there is no BT stream from your device 

Sonos speakers are on your network. For security you don’t want Sonos searching for servers (like your PC) as they can gather Personal Identifiable Information of a sort (PII); nor connecting to same without your permission. By security I'm referring to someone compromising your network using Sonos as a backdoor. However, the odds of that occurring are extremely remote with emphasis on “extremely”. 

Same as my last response

Sure you can do as you read. However, in Sonos speak a “room” is not necessarily a physical room like kitchen, living room or bedroom etc.

For instance my Arc Ultra in my bedroom is called “Nano”. My Arc Ultra in my Media Room is called “LG One”. Also in my Media Room is a a pair of Sonos Fives called “Stereo”. A room can be named whatever you like.

In the past if you used a non-conventional name for a room you had to remember what Sonos speaker was located in the room. However, today the App will help you remember what Sonos speakers/components are in a room with a visual representation. See screen shot below for example:

Just as an FYI on ​@nik9669a ‘s comment about the Era being stereo which is correct.

You can’t compare a single Era 100 against your traditional stereo setup. Also, the Era 100’s stereo separation is going to diminish after more than say 6 feet as most human ears can’t catch the reflections from a single source. So that said the your Era 100’s audio may sound closer to mono than stereo.

How do I do that? I’m not bothered if my phone or tablet connect - I've always got bluetooth switched off on them.  But I'd like to switch it off on the speaker, so that  anyone next door, say, couldn’t try to pair with it.

ie all comms should be through the network.

I didn’t even touch the second speaker when I set it up.

ps, tried to partial quote by highlighting a bit of your post but it wouldn’t work. Had to quote the lot and delete. Firefox on Android tablet