Article on forcing Mac to use AptX Codex
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Open the hardware folder and drag the 'Bluetooth Explorer' app into the applications folder
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Open the 'Bluetooth Explorer' app and click "Tools > Audio Options" in the menu bar.
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Check the “Force use of aptX” and “Enable AAC” boxes. Make sure the “Disable AAC” and “Disable aptX” boxes are unchecked.
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Disconnect and reconnect your headphones
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Hold down the 'option' key and click on the bluetooth menu to check which codex your headphones are using.