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Difference between RMS and PMPO

Difference between RMS and PMPO

There are many acronyms used in the audio world, and two of the most common are RMS and PMPO. Many people use these terms interchangeably, but they actually have different meanings. In this blog post, we will explore the difference between RMS and PMPO and explain how to use each term correctly. Stay tuned!

What is RMS?

RMS audio is a type of digital audio encoding that uses a compression algorithm to reduce the file size of the audio data. RMS stands for “root mean square,” and it is a measure of the average amplitude of the waveform. RMS audio files are typically smaller than uncompressed files, but they can still retain high-quality sound. RMS audio is often used for streaming audio, such as music or podcasts. RMS encoders are available as standalone programs or as plug-ins for popular audio editing software. When RMS encoded audio is played back, the RMS decoder reconstructs the original waveform by decompressing the data. RMS audio provides a balance between file size and sound quality, making it a popular choice for many types of digital audio.

What is PMPO?

PMPO is a measure of electrical power output that is commonly used to specify the capabilities of audio amplifiers. PMPO stands for “Peak Music Power Output” and is usually expressed in watts. The PMPO specification is often misunderstood or misused, however, as it does not indicate the continuous power output of an amplifier. Rather, the PMPO rating specifies the maximum amount of power that an amplifier can produce for a short period of time. PMPO-rated amplifiers are often used in commercial settings such as nightclubs and concert venues, where they are capable of generating high levels of sound for extended periods of time. In general, the higher the PMPO rating of an amplifier, the greater its loudness potential.

Difference between RMS and PMPO

RMS (root mean square) and PMPO (peak music power output) are two measures of audio power. RMS is a measure of the average power of an audio signal, while PMPO is a measure of the maximum power that an audio signal can achieve. RMS is generally considered to be a more accurate measure of audio power, as it takes into account the variations in an audio signal over time. PMPO, on the other hand, only measures the maximum power of an audio signal at any given instant. As a result, RMS is often used as a more reliable measure of audio quality.


In conclusion, RMS is a more accurate measurement of power than PMPO. It takes into account the harmonic distortion and non-linearity of loudspeakers, which PMPO does not. This means that RMS is a better indicator of how much power a speaker can handle without being damaged. For this reason, it is important to use RMS when measuring the power output of speakers or amplifiers.

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