I am going to have a look at the phrase "power efficiency" which shows you how much music audio amps squander to help you pick an amp. Heat doesn't radiate properly from little surfaces. Amplifiers that have small efficiency need a larger power source to output the identical level of music power as high-efficiency versions. Further, the thermal stress on the circuit board components as well as amplifier materials is much more serious and may even decrease the dependability. You ought to try to find the power efficiency value when on the lookout for a power amplifier. The best place to look is the amplifier data sheet. Efficiency is usually shown in percent. Class-A amplifiers are usually the least efficient and Class-D the most efficient. From the efficiency percentage it is possible to work out the amount of energy the amp is going to squander. An amplifier having a 50% efficiency will squander 50 % of the consumed power. An amplifier that has 90% efficiency will squander 10%.
For this reason the lower the power the amp provides, the smaller the power efficiency. To determine the efficiency, the audio energy that is used by a power resistor that is attached to the amp is divided by the overall power the amp utilizes whilst being fed a constant sine wave tone. Generally a complete power profile is plotted to display the dependency of the efficiency on the output power. Nevertheless, the most up-to-date switching-mode audio amplifiers, similar to Class-T amps, offer audio fidelity that comes close to that of low-efficiency analog small audio amplifiers described at the site amphony.com/products/mini-amplifier.htm and can be manufactured ultra small and light.