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Audio line-in port does not work - Apple Community
https://discussions.apple.com/thread/890637
Question: Q: Audio line-in port does not work Whenever I plug in a microphone to the audio line-in port and activate it, it recognizes that I've added a device (in the Sound preference panel), but there is never any sound input.
Audio Line In Not Working? | Mac Support
https://macosx.com/threads/audio-line-in-not-working.301825/
However, since that first time, the audio line in port has not worked correctly. If I go to the Sound preferences section, and select "Line In", it shows no input on the meter there, no matter how much sound I'm making with the microphone. The meter works just fine showing sound being made into the built in mic when that's selected, but not for ...
MacBook Unibody audio line-in port not working at all ...
https://forums.macrumors.com/threads/macbook-unibody-audio-line-in-port-not-working-at-all.723868/
Basically Apple changed the line-in to actual line level, rather than mic level. This has nothing to do with supplying power to the mic as some people have incorrectly stated on the web. Rather its about the signal level coming from the mic not being strong enough. If you run a cable from a line level output such as from an iPod, it will work fine.
analog - Line-in recording w/ 2012 iMac possible? - Sound ...
https://sound.stackexchange.com/questions/22358/line-in-recording-w-2012-imac-possible
The Late 2012 27" iMac does not appear to have line-in, just a headphone port. I'm not sure which model you have, but if the 27" doesn't have it, I doubt the smaller ones will. You can double-check by selecting About This Mac from the Apple menu. Then click the More Info button and then the System Report... button. Next, click on Audio to the left.
Line IN Speakers and Microphone Line IN not working ...
https://answers.microsoft.com/en-us/windows/forum/all/line-in-speakers-and-microphone-line-in-not/de6d462e-9970-48b3-8c3c-e70e66ccc01b
This means that if you plug an audio device into this port, it will not produce any sound on your computer until you enable sound for the line-in connection. To enable sound for the line-in connection 1. Open Audio Devices and Sound Themes by clicking the Start button, clicking Control Panel, clicking Hardware and Sound, and then clicking Sound. 2.
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