# Thread: how to derive rms(average) fromoeak wattage

1. 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!

2.

3. 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..