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Does High Cordless Loudspeaker Energy Efficiency Mean High Cost?

By Expert Author: Madelaine Holmon

Current cordless speakers will by nature squander a certain level of energy they consume. Picking set of wireless loudspeakers with high power efficiency may lower the level of wasted energy. I am going to teach you a number of little-known details about power efficiency to help you buy the ideal model.

A relatively large amount of energy is radiated as heat should you get a set of low-efficiency cordless speakers. This may contribute to some problems: Low-efficiency cordless loudspeakers will waste some power as heat and are more expensive to operate when compared with high-efficiency products because of the greater power usage. To shield the circuit components, low-efficiency wireless speakers need to find methods to get rid of the heat which is produced. Usually extra elements must be included to radiate enough energy and maintain the ideal working temperature. These elements are usually heat sinks and also fans. Heat sinks as well as fans are heavy, consume room and also generate noises. Cordless speakers with low efficiency can not be placed in small spaces or within sealed enclosures given that they require a great deal of circulation. Because low-efficiency cordless speakers are going to produce merely a small fraction of the energy consumed by the amp as usable audio energy, the amplifier needs a larger power supply than high-efficiency models causing more expensive. Further, the thermal stress on the circuit board elements as well as amp materials is a lot more serious and may lessen the reliability. The power efficiency is shown as a percentage in the cordless loudspeakers data sheet. Class-A amps are amongst the least efficient and offer a efficiency close to 25% only. In comparison, switching amplifiers, also referred to as "Class-D" amps provide efficiencies up to 98%. From the efficiency percentage you can work out how much energy the amplifier will waste. An amp which has a 50% power efficiency is going to squander 50 % of the used power. An amp that has 90% efficiency is going to waste 10%.

Please note, though, that efficiency depends on how much power the amplifier provides at a given moment. Amplifiers possess larger efficiency when supplying higher output power than when running at low power mainly because of the fixed energy that they use up regardless of the output power. The efficiency value in the amp data sheet is normally given for the maximum amplifier output power.

In order to figure out the power efficiency, the audio power that is used by a power resistor that is connected to the amp is divided by the total energy the amp uses while being fed a constant sine wave tone. Since the efficiency depends upon the audio power, normally the output power is swept and an efficiency curve generated which can show the amplifier efficiency for every level of output power. Even though switching (Class-D) amplifiers have amongst the highest power efficiency, they tend to have larger music distortion than analog music amps and reduced signal-to-noise ratio. Therefore you are going to need to weigh the size of the cordless loudspeakers against the sound fidelity. Even so, the latest cordless loudspeakers that use switching-mode audio amplifiers, just like Class-T amplifiers, provide music fidelity that comes close to that of low-efficiency analog amplifiers and can be produced really small and light.

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