Mine works just that way. I went with writing all the speakers in the end mainly because it was easy work an 8 port switch. Has worked without issue since.
I also set up a wireless access point and that works fine too with the speakers running on WiFi.
My question is....if I were to run an ethernet cable from my router in the house to a network switch in the bar, then subsequently hardwire those speakers, would it work??
Yes
I get there's STP implications so the switch would need to support that…
Or just use a dumb switch
Another method (that Sonos don’t recommend) is to use EoP devices. I run the downstairs Sonos devices using these and find them much more reliable than any of the Sonos network facilities - others may differ. I use upstairs switch > upstairs EoP > downstairs EoP > downstairs switch > Sonos kit
If the outside building is powered from your main consumer unit, then it should work.
My question is....if I were to run an ethernet cable from my router in the house to a network switch in the bar, then subsequently hardwire those speakers, would it work??
Yes
I get there's STP implications so the switch would need to support that…
Or just use a dumb switch
Another method (that Sonos don’t recommend) is to use EoP devices. I run the downstairs Sonos devices using these and find them much more reliable than any of the Sonos network facilities - others may differ. I use upstairs switch > upstairs EoP > downstairs EoP > downstairs switch > Sonos kit
If the outside building is powered from your main consumer unit, then it should work.
Cheers for the responses so far. Stupid question probably, but what’s EoP…? 
EoP is EtherNet over Powerline. The data is carried along your electrical wiring. It isn’t supported by Sonos, and can be problematic. But for some people it seems to work well.
You would only need a simple unmanaged switch if you cabled, so no reason for STP to be an issue.
I too have used EoP or Powerplug but whilst it worked Is was unreliable. Moving to a direct Ethernet cable was a lot better.
You would only need a simple unmanaged switch if you cabled, so no reason for STP to be an issue.
A simple unmanaged switch that is IGMP snooping-enabled.
Cheers for the responses so far. Stupid question probably, but what’s EoP…?
As @John B has responded, Ethernet over Power. You simply plug an adapter in near the source and connect it to your network with an ethernet cable and do the same at the target end. The benefit is that you don’t need to run long ethernet cable around the house or to outbuildings.
Personally, I find it very reliable - but apparently not everyone does. In our old place I had to drill through walls and ceilings to get a cable downstairs, so the EoP adapters took out all the hassle. It workd best in houses with modern electrics.
Generally, though, a cable is the best connection - but they can be quite fragile, and may need protection when using outdoors.
Hi
One more consideration. If the speakers you are adding are not voice enabled (i.e. Fives, Play 5’s, One SL’s, Play 1’s or Play 3’s) you’ll want to add an Amazon Alexa Echo, Alexa Dot or Google Home device to enable voice control.
Thanks to everyone for the responses. I realised within about 5 seconds of asking what EoP was (the fact that they weren’t referred to as powerline adapters threw me). Brainfart moment LOL. Sadly for me, they are not a practical solution as my house has a mix of old and new wiring, so the stability is spotty at best (already tested, I had a couple of redundant netgear ones in the loft gathering dust).
Just a question on the switch though...I thought it needed to support STP to stop loops happening and causing issues?? Have I misunderstood requirements? I thought I’d done decent research but IGMP snooping is not something I have come across…. :-s
That it’s the very switch i have. In fact 3 of them. All are connected directly to a port in the main router. In tried to not have a seitch connecting to another switch. That keeps issues away.
it’s also amazing how quickly you find other things to plug in and soon run out of ports on even the 8 port switch.
I also use that very switch. I have never given a second’s thought to STP and to the best of my knowledge an unmanaged switch is not going to have any impact on STP within my system.
I shall have to defer to @Smilja regarding iGMP snooping, as I didn’t know what it is either, although I had heard of it. Thanks for the link.
Me, too. :)
A broadcast storm can occur if an unmanaged switch does not support IGMP snooping.
IGMP snooping helps prevent unnecessary traffic floods, rather than broadcast storms per se.
I’ve never bothered with it in my small dumb switches, but then my Sonos subnet is largely populated with Sonos kit, not other stuff that’s uninterested in Sonos-originated multicasts.
Plugging the Playbase and a IPTV streaming box into a switch that isn’t IGMP snooping-enabled is sufficient to cripple the network. 
Fine …. it sounds like it fixes an issue with the IPTV box then. 
I then swapped the IPTV box for the Boost, same outcome. Then I tossed the switch into the bin.^^
If wiring two Sonos units caused a problem it would have been STP related.
If wiring two Sonos units caused a problem it would have been STP related.
Yes. As for the IPTV box, my bet is on multicast flooding.
Just to say I found the document on IGMP snooping helpful too - thanks
,
I don’t have switches with IGMP Snooping (Netgear GS316 & others), but do much-prefer unmanaged switches. I didn’t realise this was an available feature on some unmanaged switches. If I do ever decide/have to upgrade my switches, I will certainly bear it in mind.
Touch-wood, I’ve not ever encountered ‘storm’ issues with the switches I have and like @ratty my network does have quite a few Sonos products dotted about.
Anyhow I have learned something new today.
Re PoE Adapters, STP and Sonos, if you are in UK and add Sky to the mix this maybe worth a read:
https://helpforum.sky.com/t5/Sky-Q/SkyQ-and-Sonos-interfering-with-each-other/td-p/3589818
Read the Sky Q section of:
The sky article describes issue with 100Mbs connections. I actually came across it when checking network matrix was healthy after adding another wired Sonos device, and noticed the STP root bridge was not as expected turned out from the mac address it was a SkyQ box installed a few months back even though WiFi was disabled on SkyQ.
The root bridge is a network entity that’s independent of Ethernet, WiFi, SonosNet, etc. It’s the device with the lowest value of bridge priority; if multiple devices have the same lowest priority it’s the device with the lowest value of MAC address. It’s not unusual for routers or other infrastructure items to have a lower bridge priority value (and hence a better chance of being root) than Sonos’ default configuration. This is generally a Good Thing, as the root should usually reside in the core of the local network.
This has all been very helpful, thankyou. One final question, will hardwired speakers still transmit the Sonosnet mesh (in effect acting as extenders) or does the wireless transmission switch off when connected to ethernet? I feel like I should know the answer to this already, but you know when you second guess yourself? Yeah, that!
Cheers in advance (again)
