802.11ac support?

According to the FAQ posted by Sonos:

Wireless-N and Wireless-AC routers should work with Sonos as long as they are still broadcasting over B and G WiFi. Most Wireless-N and AC routers should do this unless manually configured not to.

To me, that suggests that they don't.

Does Sonos playbar support 802.11ac 2.4 GHz?
A contradiction in terms. 802.11ac is only at 5GHz.

AC has full backward compatibility to a, b, n, etc, as well as ADDS 5ghz, in order to deal with interference by other devices in the 2.4ghz range, such as cordless phones. Unlike the previous standards which did not always play nice with each other. Range is diminished in the 5ghz band, however.

No Sonos does NOT support 802.11n nor 802.11ac. If you're router is running on either of these protocols, SONOS will NOT work. My Linksys EA7300 N router let me configure it to run on B/G only ... and when I made that change, then SONOS did indeed work. But, I my wireless through-put fell from 40Mbps down to sub-10Mbps. It was painfully slow - not worth it. I changed my router back up to 802.11N, the SONOS Connect:AMP stopped working (as expected), I tried to connect a SONOS Boost directly to my router ... but am having no luck with that. Looks like it's time for me to return the system.

There's something wrong with your router. I just rechecked a small Sonos system -- for this test a single PLAY:1 in WiFi/Standard mode -- which was streaming local Ogg Vorbis files. At the same time a phone on 2.4GHz 802.11n was happy to pull 40+ Mbps. Have you tried toggling the Airtime Fairness setting?

A wired BOOST added to the system should just work, switching the system into SonosNet mode. If it doesn't, simply call Sonos Support. Giving up and returning the units is not the answer.

Thanks for the help ratty. My router (Linksys EA7300) is relatively new. I got it about 6 months ago and have been using it with no problems - including streaming from Amazon Echo during this time. I'll try to look into the Airtime Fairness setting ... and appreciate any other advice you can give.

An update: The Boost is now working, so now it appears that that my Connect:AMP is working in SonosNet mode ... but not in 802.11N nor 802.11AC WiFi mode. Note to the Sonos Prod Mgmt team: it would be VERY HELPFUL if the Sonos app or devices could indicate whether they are playing over SonosNet or WiFi. To test my assumption that it was playing over SonosNet and not 802.11 N/AC WiFi, I unplugged the Boost and my Connect:AMP stopped playing a few seconds later. So, to answer the OP: no, you can not stream to the Sonos Connect:AMPs over 802.11N or AC, at least if you're using a Linksys EA 7300 router. BTW, I'm still having issues with my Boost - it is now saying that I need to upgrade the software but gives me errors and won't let me upgrade the system. Will spend the next half of the day trying to run this one down.

Go to Settings/About My Sonos System. A device which shows WM:1 is on WiFi. If it shows WM:0 it's on SonosNet or wired.

Your BOOST will almost certainly need updating if it's new. That should just work. If for some reason it struggles, wire the CONNECT:AMP as well temporarily.

Once the update is done, go to Advanced Settings/Wireless Setup and remove/reset the WiFi details. This will stop the system from attempting to use WiFi.

There's obviously still something funny about your router. If it's on N only then WiFi mode is not possible for Sonos devices. A mixed (b/g/n) setting should have worked fine.

Thanks again ratty. I'm still in all sorts of setup hell with my BOOST and CONNECT:AMP on different versions of software and as a result, I can't upgrade the BOOST. But that's a separate topic for which I'll create a seperate thread. But, at least we got the definitive answer for to the OP. Definitely, 100% confidence: Sonos does NOT support 802.11AC. Here's a message from Sonos tech support (who have also been trying to help me out with my issue to no success): "Sonos only works with B/G network modes. Details here: https://sonos.custhelp.com/app/answers/detail/a_id/127"

Well of course Sonos doesn't support AC in its literal sense. AC operates at 5GHz.