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Thread: how to derive rms(average) fromoeak wattage

  1. #1 how to derive rms(average) fromoeak wattage 
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    Jun 2011
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    hey ive been doing alot of reading on wattage applications.. i'll relate it to a car amp cuz i have an example
    so i have some off brand amp thats pretty hard to find specs for, its a TNT 1832, it will push 1200 watts peak at 2 ohms mono (i assume they mean bridged)
    but reading more info on it they say that it can hold 300 watts average (rms) mono, or 150 watts x2 at 2 ohms
    That doesn't really make sense
    I thought to find the "average" (rms is kinda a sticky term) that the rms is 70.7% of the peak power.. so at 1200 watts peak at 2 ohms, it should be 848.4 watts rms at 2 ohms (mono) not 300 watts, correct?
    or am i wrong..
    so i also understand that peak power equals the ac voltage, which multiplied by .707 you get the average power, or the dc voltage.. i think im wrong with something about that?
    if this is all comeing from a car battery then how does it convert to ac at all? or does the amp convert it to ac?

    there are numberous other amps i see everywhere, they say like 3000 watts peak and 1000 watts rms, or 1000 watts peak = 500 watts rms.. just makes no sense
    just trying to understand, thanks in advance!


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  3. #2 Re: how to derive rms(average) fromoeak wattage 
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    Quote Originally Posted by big red*
    hey ive been doing alot of reading on wattage applications.. i'll relate it to a car amp cuz i have an example
    so i have some off brand amp thats pretty hard to find specs for, its a TNT 1832, it will push 1200 watts peak at 2 ohms mono (i assume they mean bridged)
    but reading more info on it they say that it can hold 300 watts average (rms) mono, or 150 watts x2 at 2 ohms
    That doesn't really make sense
    I thought to find the "average" (rms is kinda a sticky term) that the rms is 70.7% of the peak power.. so at 1200 watts peak at 2 ohms, it should be 848.4 watts rms at 2 ohms (mono) not 300 watts, correct?
    or am i wrong..
    No, that's not quite right. Read here about amplifier power ratings.
    http://www.meyersound.com/support/papers/amp_power.htm
    When an amplifier is rated in RMS watts, this is a shorthand way of saying “average watts obtained by the RMS method.”


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