Sonos Five can’t detect 5Ghz Wifi

@ratty ; 😁 you're definitely ruling this board. Wanted to receive input from other subject matter experts, that's why i posted a similar question in this thread. 
Anyhow. Thanks again for your wise words and quick response

Ps. In above example. Which is the HT master player. It's that the sub or the playbar?

I’ll leave it to others then...

The Playbar, in your case. The one at the front, responsible for the audio decode and playing the L/C/R channels. 

Ok. Understood

Can you educate me how, if the playbar is on 2.4ghz., the satellites (slaves)  connect to 5ghz when the master is at 2.4ghz? 

The master player contains two radios: one 2.4GHz, the other 5GHz. The former is the primary wireless connection to the network (assuming the player isn’t wired that is) and the latter constitutes a private access point for the satellites. (This is why a HT master is unable to connect to 5GHz WiFi. The 5GHz radio is already occupied.)

Thanks Ratty... As always

It perfectly makes sense in the way you explain it. Much appreciated

Force the 5ghz compatible devices to connect to your 5ghz network by:

1. Designating a unique SSID for your 5ghz network (e.g., “network” for 2.4ghz and “network-5g” for 5ghz. 
2. In Sonos app, delete existing network(s) if 5g and 2g networks previously shared the same SSID. Will need to connect one Sonos device by wire to setup new network(s) in app.
3. Only add 5ghz network SSID to Sonos app.  All 5ghz compatible devices will connect to 5ghz network.
4. Connect remaining devices to 2.4ghz network by adding the SSID for 2.4ghz network.
5. Verify that devices connected to the right network by accessing your routers administrative console (i.e., 192.168.1.1)
6. If you restart your router, you will need to manually force the 5ghz devices to connect to 5ghz again. To do this, simply go into Sonos app and delete (forget) the 2.4ghz network, while retaining the 5ghz network. 5ghz devices will connect. Once 5ghz devices are finished connecting, re-add the 2.4ghz network SSID to connect remaining devices. 

@Emerson VA, According to your profile you got a Boost. Are you running the system in mixed SonosNet/WiFi mode?

No, I disconnected the boost, the performance is much better over WiFi using 5ghz vs. SonosNet. Using SonosNet I was experiencing frequent dropouts, to the point where it was simply unbearable. Even with two boosts, and several speakers wired over Ethernet, SonosNet doesn’t allow enough bandwidth for my setup (15 total speakers).