10 Replies Latest reply: May 12, 2010 7:56 AM by Misi
Thanos Chrysakis Level 1 Level 1

It seems that while there is input signal going through the build-in mic
(the input level works fine) no sound comes out of the internal speakers.

The internal speakers work just fine when I play other applications but
no with the built-in mic.


MacBook Pro, Mac OS X (10.5.8)
  • Jay Bullock Level 4 Level 4
    What application are you using?
  • Thanos Chrysakis Level 1 Level 1
    Thanks for the response.
    I'm not using it through some application.
    I just want to hear it as it seems that it gets
    input but no sound gets out from the internal speakers.

    The input level of the built-in mic works fine.
  • Jay Bullock Level 4 Level 4
    You need to be using a particular application to process the sound coming into the microphone and route it to the speakers. The Finder or System Preferences won't do that for you.

    The reason is simple: Feedback. When you speak into the built-in mic and route that through the speakers, the mic will also pick up the sound coming from the speakers. That leads to a feedback loop, including the dreaded high-pitched squealing that is the bane of musicians and professional sound people everywhere.

    Meaning, in general, you actually +do not+ want to have sound coming from the speakers when you are using the built-in mic. That's why you can't just do it casually on your MacBook.
  • Thanos Chrysakis Level 1 Level 1
    I know about feedback and all that as I'm a musician. It's not ALWAYS the case that you're getting feedback if you're having the built-in mic and the internal speakers working together. It depends what you're doing with the mic. And a bit of feedback is not always bad, it depends what someone wants to do after all.

    Anyway, even if I try it with a pair of external speakers
    no sound comes out.
  • Jay Bullock Level 4 Level 4
    Right, again, you need an application besides the Finder to make the mic active and send the sound anywhere. Fire up, for example, GarageBand, and you can set the input to the built-in mic, turn monitoring on, and knock yourself out.
  • Thanos Chrysakis Level 1 Level 1
    Jay thanks for your responses but NORMALLY
    someone should be able to configure the built-in mic and
    the system's output from the Audio MIDI Set Up>Audio Devices
    with no need of going through an audio application.
    It is definitely something else.

    thanks anyway.
  • Jay Bullock Level 4 Level 4
    Yes, you can configure the input and output prefs through System Preferences, but SP does not +turn on the mic+. Nor does Finder. You need some other app that demands sound input--GarageBand, Skype, iChat, PhotoBooth, something--to make the mic active.
  • Fortuny Level 7 Level 7
    Hi Thanos,

    the Audio-Thru is not a feature of OSX.
    Have a look at the freebie LineIn http://rogueamoeba.com/freebies/


  • Thanos Chrysakis Level 1 Level 1
    Thanks for the responses to both.
  • Misi Level 1 Level 1
    I need some help. My built in mic used to work but stopped.
    I am trying to skype with family overseas and my mic it's not working.
    I have gone to audio preferences- it is not on mute and when I talk the level doesn't move no matter how high i select volume.
    any ideas? Thank you