Line-In Issues

Discussion in 'Mac Apps and Mac App Store' started by PrometheusG5, Jul 6, 2004.

  1. PrometheusG5 macrumors member

    Joined:
    Jun 23, 2004
    Location:
    San Francisco, CA
    #1
    I know there was a thread about this a while ago...

    But why does the line-in jack on my PowerBook G4 accept input from line-in mics? The line-in will work when I am recording from my stereo, for example, but in using a regular microphone, it doesn't register. I have to use either a USB or Bluetooth set to record in. :confused:
     
  2. idkew macrumors 68020

    idkew

    Joined:
    Sep 26, 2001
    Location:
    where the concrete to dirt ratio is better
    #2
    you need a pre-amp.


    you can buy usb line in's that don't require a pre-amp for $40.
     
  3. PrometheusG5 thread starter macrumors member

    Joined:
    Jun 23, 2004
    Location:
    San Francisco, CA
    #3
    Why does the PowerBook G4 need a pre-amp for mic line-in? It's just a curiosity question now, since I bought USB and Bluetooth devices.
     
  4. WinterMute Moderator emeritus

    WinterMute

    Joined:
    Jan 19, 2003
    Location:
    London, England
    #4
    Mic level is very much lower than line level, it requires a pre-amp to raise it to line level (Unity Gain). Your line-in expects a signal strength at line level, mic level is too quiet.

    Mics are physical transducers, they use mechanical and eletro-magnetic properties to produce electrical signals from the vibrations of sound, but even very expensive mics only produce mic-level signals and therefore require a pre-amp.
     
  5. PrometheusG5 thread starter macrumors member

    Joined:
    Jun 23, 2004
    Location:
    San Francisco, CA
    #5
    Ah...that makes perfect sense. I was using mic in and line-in interchangeably. So when I connect from my receiver to line-in, it is already amplified, correct?
     
  6. WinterMute Moderator emeritus

    WinterMute

    Joined:
    Jan 19, 2003
    Location:
    London, England
    #6
    Yes, your hi-fi uses an integral pre-amp to level out oll the slight differneces in all the units before passing the signal to your power amp to throw it at the speakers, the signal from your reciever is a pre-amped signal automatically.
     
  7. solvs macrumors 603

    solvs

    Joined:
    Jun 25, 2002
    Location:
    LaLaLand, CA

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