RMS is also known as Root Means Square. This is a type of measurement that is available to help determine the values of the power outputs. PMPO is known as Peak Music Power Output. This refers to the quality of sound that is released by the amplifiers.
There are some people who refer to this as the most power that certain speakers can produce. Some companies would use the term PMPO when they want to advertise how strong the speakers are going to be. Some people would like to find the right speakers to use depending on how versatile the items are. RMS can be used to compute how powerful the speakers are.
In the music world, two terms have many similarities. They are RMS which stands for root mean square and PMPO, which means peak music power output. When you use root mean square, you are getting the power outputs of their output values.
The peak music power output is used for marketing or advertising. If you have ever hooked up your guitar to an amplifier, you may be using root mean square because you will want to measure the amount of power from the amplifier. Many advertisers will use peak music power output to try to sell their amplifying ways to consumers who are making music. They would use this term instead of the root mean square term.