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  • fastandweird
    Posts: 9
    Joined: Oct 31st, 2008
    assigning meaning to multiple forms of dB
    Hi, Right now I am listening to headphones at a setting of -22dB. I often hear the dialogue while editing should be between -12dB and -6dB. Don't ever want to go above 0dB. My room's natural level is about +60dB. If I crank up the stereo, it gets up to +110dB. Anyone able to help me put this in perspective? very confused. Thanks! Jeff
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  • Rounik Admin
    Posts: 8713
    Joined: Dec 16th, 2006
    Re: assigning meaning to multiple forms of dB
    Hi Jeff, This might be of interest: [url]http://www.exair.com/en-US/wiki/Wiki%20Pages/sound%20levels.aspx[/url] When you say your headphones are set to -22dB what do you mean? In Logic? On your audio interface? Going over 0dB on Logic's master output will likely cause clipping and distortion. Your final output for video/film should reside somewhere between -12dB and -6dB. This means when you are outputting your final mix/master, make sure your output signal doesn't exceed these values (on the Channel strip level meter). You can use a limiter to stop the signal exceeding a certain value... How loud your stereo can go is of no relevance to the output within Logic. At the end of the day dB are a relative way of measuring sound levels. Hope that helps :) Rounik
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  • fastandweird
    Posts: 9
    Joined: Oct 31st, 2008
    Re: assigning meaning to multiple forms of dB
    Rounik, Thanks for that link, very helpful. I'm trying to figure out why everything isn't working on the same scale. If I record a conversation at 60dB, why is it showing up as -12dB to -6dB? why isn't it showing up as 60dB? why is 0dB the limit for how loud something should be? why isn't it a positive value?
    Reply
  • fastandweird
    Posts: 9
    Joined: Oct 31st, 2008
    Re: assigning meaning to multiple forms of dB
    [quote:7638] When you say your headphones are set to -22dB what do you mean? In Logic? On your audio interface? **on my audio interface** How loud your stereo can go is of no relevance to the output within Logic. **i was trying to illustrate an actual volume level read off a loudness or decibel meter- this 110dB sound would, i gather, be read as 0dB or clipping in FCP** Rounik[/quote] thanks for the help!
    Reply
  • Rounik Admin
    Posts: 8713
    Joined: Dec 16th, 2006
    Re: assigning meaning to multiple forms of dB
    Hi, No problem! You might be interested in this tutorial on Sound: [url]http://www.macprovideo.com/tutorial/sound[/url] Also, Martin talks in depth about amplitude, frequency and sample rates in the Core Logic 8: Logic 101 [url]http://www.macprovideo.com/tutorial/Logic8101[/url] Hope that helps :) Rounik
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