HT 5gh band change

Its not fixed, channel choice is dynamic for the 5GHz connection to the surrounds.

The only way I know of to see it is the Device view in “Phonos Ultimate (Preview)”, for Windows. Sample display:

Thanks for the reply, that's a shame, I was hoping they had maybe set a group of channels. Been able to view it doesn't help unfortunately,  I'm not there to swap router channels around and my friend wouldn't have a clue. I know it's not something a lot of people suffer from but it's annoying it can't be changed. Are we saying the only fix for this is turning the surrounds off every time there's a channel match which causes the drop outs. 

I would say the real fix is to get a better router that can handle more simultaneous frequencies/devices. I have around 65 devices on my Wifi, with 12 of them Sonos devices, spread across both frequencies and two subnets, never a problem.

I don't think Linsys are bad routers and Ubiquti have a problem with this according to other reports online, could you please explain how that helps? From my understanding the Sonos isnt connecting to the router on the 5ghz, it's connecting to the 2.4, the issue seems to be when the sonos chooses a 5ghz channel that's the same as the router or overlaps and causes interference. It's a hidden mesh network so the router, even if it's in auto channel mode can't prevent clashes.  I'm guessing it's going to be infrequent and random but that could happen any time, his wife was doing a speed awareness course online when I set the sonos up and she lost wifi, so did his phone and the TV, it was continuously disconnecting. Maybe it was a fluke, he hasn't said it's happened since, I just want to make it bullet proof. I had no issues as all my smart stuff is 2.4, our phones are wifi6 so don't have a problem and most of my gear is hard wired, we have the same broadband and routers believe it or not. 

If you have a decent router such as Ubquiti then you can see, very clearly, what frequencies are in use, by device and location, and you can auto-rebalance all of your APs every evening to maximize coverage. A router “dodging” a 5GHz-for-surround channel is no different to how it handles “dodging” your neighbors 5GHz AP. You also get system logs indicating when devices have problems, or when they move from one AP to another, so if you do have problems you can go look somewhere for clues.

I didn’t know Linksys were still in business, when I last had one I didn’t have gray hair and they offered nothing like that.

My APs can see over a hundred different SSIDs in my area, but they handle it brilliantly. A few surrounds using 5GHz isn’t going to fluster them.

Plus to be clear, my local network is absolutely critical to me: I work from home, my wife is a vocal customer if things go awry, and I have multiple Sonos systems for app testing purposes.

Ok many thanks, my friend isn't an IT expert, not everyone has enterprise wifi, some people still use there provided routers. I will have to go looking for the relevant info, the point is I've read even Ubiquti can't see the hidden mesh network so it's not able to "dodge" it like your neighbors 5ghs wifi. Thank you for taking the time though. 

The hidden mesh network you are alluding to is probably Sonosnet, that is used to keep speakers off your WiFi. It’s a separate 2.4Ghz network, so not the dedicated 5Ghz connection from soundbar to surrounds/Sub.

I didn't highlight this, that was Google. 

Check your 5GHz channel width is set to 40MHz (ie don’t set to 80 or 160) on the router/APs, if you do have an 5GHz interference problem, this will reduce the overlap from your devices. Keep your 2.4GHz on 20MHz.

https://www.intel.com/content/www/us/en/support/articles/000058989/wireless/intel-killer-wi-fi-products.html

On the 5 GHz band, set the channel width to 40 MHz and see if that improves reliability. Keep in mind that 80 MHz and 160 MHz channel widths may carry the promise of extra speed, but will also interfere with, and receive interference from, many more sources than 40 MHz.

On the 2.4 GHz band, set the channel width to 20 MHz and see if that improves reliability. 40 MHz Wireless-N is rarely optimal, as it will interfere with nearly the entire spectrum of Wireless-N channels.

Many thanks I will check his router, pretty sure 2.4 will be 20mhz as I've never seen a router set to 40 by default but his 5gz maybe at 80, we have 900mb so they might come set at that.

Edit, actually it looks like 40mhz can only achieve 200mbs so it's almost a certain it comes set at 80. I may have to let him down on his max attained speed to fix the problem. I know 200 is plenty but I deal with customers every day who complain about not seeing there max speed on a speed test, I fit Ubiquity as part of been an AV installer but not on a Comercial/enterprise level. 

Tell your customer(s) that wireless network performance is not about some random speedtest number at some random point in time, its about overall efficiency, reliability, stability and customer experience.