Stereo amplifier models are going to naturally waste some level of energy they consume. Selecting an audio amplifier with high efficiency may lower the level of squandered energy. I’ll talk about some little-known facts about amplifier power efficiency that will help you choose the best model.
Numerous problems are attributable to amplifiers that have low power efficiency: Low-efficiency amplifiers will waste a certain amount of energy as heat and so are costlier to run in comparison with high-efficiency products due to their larger energy consumption. Heat will not radiate effectively through tiny surfaces. For that reason low-efficiency amps require to use heat sinks. These heat sinks consume a reasonable amount of space and make the amp bulky and heavy. Further more, they raise the expense of the amplifier. To help dissipate heat, low-power-efficiency amplifiers will need sufficient air circulation. As a result they can’t be put in places with no circulation. Furthermore, they can’t be installed in waterproof enclosures.
Amplifiers with low efficiency need a larger power source in order to create the identical level of audio power as high-efficiency models. An increased level of heat leads to additional stress on elements. The lifespan of the amplifier can be lowered and dependability could be affected. High-efficiency amps in contrast do not experience these issues and may be designed small.
You need to try to find the efficiency value when searching for an audio amplifier. The best spot to check is the amplifier data sheet. Power efficiency is commonly displayed in percent. Analog Class-D amplifiers offer a efficiency of roughly 25% whilst switching-mode amps offer close to 98%. The larger the efficiency value, the less the amount of energy wasted as heat. A 100-Watt amp with a 50% efficiency will have an energy consumption of 200 W.
Take note, however, that efficiency depends on how much power the amplifier provides at a given moment. Each music amp will use up a specific amount of energy regardless of whether or not it supplies any kind of power to the loudspeaker. For this reason the lower the energy the amp delivers, the lower the efficiency. As a consequence audio makers usually specify the efficiency for the greatest audio power that the amplifier can provide.
In order to determine the power efficiency, the audio power that is used by a power resistor which is attached to the amplifier is divided by the total power the amplifier utilizes whilst being fed a constant sine wave signal. Usually a complete power profile is plotted to show the dependency of the efficiency on the output power. Because of this the output power is swept through different values. The power efficiency at each value is measured and a power efficiency plot generated.
Switching-mode amps utilize a switching stage which will cause a certain amount of non-linear behavior. Therefore Class-D amps normally offer lower music fidelity than analog Class-A amplifiers. Due to this fact you are going to have to base your buying decision on whether you require small size and minimal energy consumption or maximum music fidelity. Nonetheless, the most recent switching-mode audio amplifiers, similar to Class-T amps, provide audio fidelity that comes close to that of low-efficiency analog amplifiers and can be built extra small and light.


