| Electronics > Beginners |
| Can I connect a 100W subwoofer to the 40W+40W rear speaker outputs of a stereo? |
| << < (5/5) |
| Zero999:
--- Quote from: Bassman59 on September 05, 2019, 04:23:08 pm ---Let's see how much power that amp puts out when driven into clip, which is (unfortunately) very common for subwoofer amps. --- End quote --- I see what you meant now. To answer your question, an amplifier will output a maximum of double the output power when driven into clipping, which will be 80W per channel in this case. This is because the RMS voltage of a squarewave is equal to its peak value and the RMS voltage of a sine wave is equal to V/root(2). R = V2/R and VRMS = VP/root(2). For example: Suppose the maximum output voltage of the amplifier is 8V and the speaker impedance is 4Ohms If the output is a sinewave, without any clipping, the peak voltage of the sinewave will be 8V. Calculate the RMS voltage: V = 8/(root(2)) = 8/1.414 = 5.657V R = 4 Calculate the power P = V2/R P = 5.6572/4 = 32/4 = 8W Suppose it's driven into clipping, so the output is a squarewave. The RMS voltage of the squarewave is simply 8V. Calculate the power V = 8 P = V2/R = 82/4 = 64/4 = 16W See it's double! In reality the user will not drive their amplifier so far into clipping to the point of it being so distorted, it's a squarewave, giving 80W per channel, a total of 160W. They most likely reduce the volume long before that point and the music won't be playing at a full duty cycle, so it's a non-issue |
| Navigation |
| Message Index |
| Previous page |