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I'm curious as to why the same BT profile achieved 8kHz to my Big Sur Mac with a Bluetooth 4.0 chipset, 16 kHz to a Big Sur MacBook with a Bluetooth 4.2 chipset and 24 kHz to the iPhone 11 Pro with a 5.0 chipset (and the other custom Apple chips of course). Any ideas?

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How do you measure that? Most likely this is some Apple propietary sheninangs so all bets are off. They are probably limiting things in software for reasons.

It is highly unlikely to be related to the BT version itself. There have been no bandwidth improvements to classic Bluetooth for decades. And Apple is unlikely to use LE Audio since BT 4.0 didn't had the required bandwidth for even full duplex 8kHz.

If you drag a Voice Memo to the finder you can find it under Get Info > More Info. This is handy because it syncs the memos from the iPhone back to the Mac for direct comparison. You can also see the it being negotiated in the debug console for both Mac and iPhone or in the Bluetooth Explorer audio graph for the Mac.

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