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Thread: DB Level?

  1. #1 DB Level? 
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    How do you calculate total DB level of multiple items.


    Let's say I have 1 object producing 25dB and another producing 25dB

    What is the total dB and how did you get it?



    Another example


    1 object producing 10 dB

    2nd object producing 25dB




    another example


    1 object producing 10 dB

    2nd object producing 10dB

    3rd producing 30dB





    Thank you !


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  3. #2  
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    Quote Originally Posted by ScienceNoob View Post
    How do you calculate total DB level of multiple items.


    Let's say I have 1 object producing 25dB and another producing 25dB

    What is the total dB and how did you get it? {etc}
    A decibel is a ratio measure (= 10 log (X2/X1)), so your question is equivalent to "How do you calculate the total ratio of multiple items." With that translation in place, I hope that you can see that your question doesn't make much sense; "total ratio" is similarly meaningless.

    Can you try again?


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  4. #3  
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    As dB is relative, it needs to be defined. dBm, dBspcl? dB in voltage or amperage as in RF energy, or in sound levels? Or in wattage (power levels?) It is used as a relative measurement of power either in potential or in flow, or both.
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  5. #4  
    Forum Professor astromark's Avatar
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    Down at the street level, maths.. simple arithmetic. Anything more complex flies over the heads of most if not all.
    Then finding of those that care or will show enough interest to answer or inquire.. or even read.. good luck.
    ~ Because I have worked with Sea floor mapping and ultra sound echo graphing.
    I have some understanding of what I have worked with. , and almost no more than that.
    So I introduce a different slant on your question.. Just as when talking of Earthquake strengths we measure a magnitude..
    and talk of scales of energy imparted. Accelerations of motions and so on.. It's complicated. So is sound energy measurement..
    On the left front of stage we have a base guitar and amp., producing 200 db.. or watts of.. How do we calculate the whole of stage output and from what distance and place do we measure any of these outputs.. Just what are you asking us ?
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  6. #5  
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    Thanks for all the help it seems my lack of knowledge on decibels caused several flaws in my main thread.

    I thought sound level was much simpler than it really is.
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