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5GHz isn't a panacea, at least in my experience. It doesn't penetrate walls well enough to reach to the edges of my (quite small) apartment, so my laptops and other devices drop down to an acceptable rate on 2.4GHz.

In addition, I think Sonos still sells devices without 5GHz radios (and probably plenty of other companies).

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Same experience here. Amusingly, 5ghz works halfway down the block outside the building but dies in my bedroom. It's an older building, and the walls are built like bunkers.

2.4ghz works perfectly, and always has. I think the real answer here is more dual band routers, even in cheapo ISP provided combo boxes.

Maybe you have thicker walls, but 5Ghz should really be able to work in a small apartment.

Lack of support is a huge problem though. Tons of devices are sold without 5Ghz support.

I live in NYC with old, thick walls (and a lot of interference, even on 5GHz). Even though my apartment is small, there are 3-4 walls separating where my AP is (at one end) and the other end of my apartment (the bedroom).

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