The switch inside the headphone jack causes the system to mute the output, switch to the jack and then unmute. You will notice that the music does not immediately start coming through the headphones.
Insert headphone jack while wearing just one earpiece. Try this also - Play some music through internal speakers. Mac headphone jack is also software controlled, it is not a simple analog output controlled by a mechanical switch alone! How do we know this? Look at System Preferences - you can have something plugged into the headphone jack and still direct audio output elsewhere, such as a USB DAC. Why is it definitely not a hardware (bad socket or headphone) problem?ģ. If you do mess with it, and you create a hardware problem by incorrectly applying meter probes or by some other method, then you will have a hardware problem and you won't have a warranty any more either. Secondly, you have a warranty and you should be taking your machine to an Apple authorized service centre if you still don't believe me, not tinkering with it yourself. Firstly, it's pointless - this is nothing to do with hardware. Hey night4cat: if you don't know how to measure impedance I strongly recommend you don't do it.
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