“If I use this between an iMac's USB-C port and a pair of speakers with a standard 3.5mm male audio plug, is there something within System Preferences to set for that?”
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You shouldn't have to worry about system settings, from the perspective of macOS that adapter might as well just be a normal audio jack and should work just like a built in audio jack. In my experience sometimes it isn't detected by my device, but unplugging and plugging it back in fixes any detection issues.
Sorry, there was a problem. Please try again later.Usually macOS figures it out automatically but if it doesn't you would need to go into System Preferences - Sound - Output and select the adapter.
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