Hi, I'm designing an amplifier and need help with some basic ideas (Filtering is already taken care of). My main question is bolded. The output is an audio signal, and it drives an 8 ohm speaker. The power is 1 watt through this speaker. The input signal is coming from another amplifier that says its full-scale output is 1Vrms. So the output specification is 1 watt through 8 ohm speaker, so (Vo^2)/R = 1W, Vo = sqrt(8) = +or- 2.828427V. The power rail of the amp will be 5V and it can source over 2 watts, so this will be ok. So now I know my gain is to be Vo/Vi = 2.828427V/1Vrms. . . Do I need to convert my output audio voltage to RMS, or do I need to convert my 1Vrms input to normal V? Also, I would imagine my Vi of 1Vrms is going to actually be greater since the input impedance of my audio amplifer is going to be more than a 10k ohm load as specced for the input signal.