Energy Sistem as a brand committed to music and to all the sensations aroused, recognizes the importance of loudspeakers power in sound quality. Therefore, in this guide, we are going to explain each level of power which is available in the market, in order to familiarize with most technical features and to get, in this way, a better confidence when choosing a sound system, according to our needs .

Generally speaking, we can say that the power is measured in WATTS (W) and indicates, in some ways, the “strong” construction of loudspeakers. There are different ways of expressing the power depending on its manufacturer: continuous power (RMS) or peak power.


RMS means “Root Mean Square” indicates a statistical measure of the magnitude of varying quantity. This is the maximum radiated power that can be supported by the loudspeaker before distorting the sound in excess or is reaching the point of being deteriorated.

If the loudspeaker works exceeding this power rating, it will be damaged inevitably because it won’t be able to clear the heat produced by the electrical current that circulates through the coil and that one can melt the insulated copper coils.

This power measurement gives useful information when valuating a sound system and can be useful as a comparator between different models. It is, definitely, the power which will work as a guide when deciding a purchasing because it is the most accurate and which gives much more value.


It is the amount of electric power that a loudspeaker is able to support with a pink noise input signal (a sound that simulates a musical theme) without suffering permanent damages.

The duration of the test is just one second and it is repeated 60 times with one-minute intervals.

The value obtained is calculated out the nominal impedance. For this reason and while using a pink noise “as preferred” (in ideal conditions) are obtained the results offering an unreliable information.


The PMPO or “Peak Music Output” is the maximum power output. This term concerns the maximum power supplied and dissipated successfully to the loudspeakers, under perfect conditions. It is measured in extremely short time intervals (10ms) and until the loudspeaker will be break.

It is important to make clear that the power PMPO is not a “real” value. It is a commercial detail, totally useless, used by thousands of manufacturers, in order to have a strong argument in order to sell much more. Therefore, for a higher fidelity it is recommended to use power rating that represents the real power that the loudspeaker is able to support.

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