I’m going to take a look at the expression “power efficiency” that shows you how much wireless speakers squander to help you pick a pair of cordless speakers. The less efficient your cordless speakers are, the more energy is going to be wasted which results in many problems: Low-efficiency wireless speakers are going to squander some energy as heat and are more costly to operate than high-efficiency types because of the larger energy usage. The wireless loudspeakers therefore is going to get relatively big and pricey. Furthermore heat fans will generate operating noise. To help dissipate heat, low-power-efficiency amps will need enough air circulation. As a result they can’t be put in places with no circulation. Considering that low-efficiency outdoor cordless speakers are going to provide just a small fraction of the energy consumed by the amplifier as useful audio energy, the amplifier requires a larger power source than high-efficiency products causing more expensive. The lifespan of the wireless speakers can be reduced and dependability can be compromised. The power efficiency is shown as a percentage in the wireless loudspeakers data sheet. The higher the efficiency value, the less the level of energy squandered as heat. A 100-Watt amp having 50% efficiency will have an energy usage of 200 Watts.
Since each amp will need a specific amount of energy, regardless of the level of energy the amp delivers to the speakers, the amp efficiency is larger the more energy the amplifier delivers and is typically specified for the greatest power the amp can handle.
In order to determine the efficiency, the audio power that is consumed by a power resistor that is attached to the amp is divided by the total energy the amp uses whilst being fed a constant sine wave tone. To have a full power efficiency profile, the audio power of the amplifier is swept between different values. At every value the efficiency is assessed and then plotted onto a graph. Although switching (Class-D) amps possess among the greatest power efficiency, they have a tendency to possess larger sound distortion than analog audio amplifiers and smaller signal-to-noise ratio. For that reason you will need to weigh the size of the cordless loudspeakers against the audio fidelity.