Current cordless speakers are going to naturally waste a certain amount of energy they consume. Selecting pair of wireless loudspeakers with high efficiency may minimize the level of wasted energy. I’m going to explain a few little-known facts about power efficiency to help you pick the perfect type.
The less efficient your cordless loudspeakers are, the more energy is going to be squandered which leads to various complications: Low-efficiency bluetooth outdoor loudspeakers are going to waste some power as heat and so are costlier to use in comparison with high-efficiency models because of the higher power consumption. Cordless speakers that have lower power efficiency routinely have various heat sinks in order to help radiate the squandered power. Heat sinks and fans are heavy, consume room and also produce noise. In order to help radiate heat, low-power-efficiency amplifiers require adequate air movement. Therefore they cannot be put in places without circulation. Also, they cannot be mounted in waterproof enclosures.
Wireless loudspeakers that have low efficiency need a bigger power source in order to output the identical level of audio power as high-efficiency types. Further, because of the large level of heat, there will be much higher thermal stress on the electrical components as well as interior materials which may cause reliability problems. In comparison, high-efficiency cordless speakers can be produced small and light.
While purchasing a pair of wireless speakers, you can find the efficiency in the data sheet. This value is generally listed as a percentage. Analog Class-D amps provide a power efficiency of around 25% whilst switching-mode amps offer as much as 98%. The higher the efficiency value, the less the amount of power squandered as heat. A 100-Watt amplifier which has a 50% efficiency would have an energy usage of 200 W.
However, there are several things to note regarding efficiency. First of all, this figure will depend on on the level of power that the amplifier is delivering. Amps have larger efficiency when delivering larger output power than while operating at small power mainly because of the fixed energy that they use up irrespective of the output power. The efficiency figure in the amp data sheet is usually given for the highest amp output power.
To determine the power efficiency, the audio power that is consumed by a power resistor which is attached to the amp is divided by the overall power the amplifier utilizes while being fed a constant sine wave signal. Given that the efficiency will depend on the audio power, commonly the output power is varied and an efficiency curve made which can display the amplifier efficiency for every level of output power.
Even though switching (Class-D) amps possess among the greatest power efficiency, they have a tendency to have larger sound distortion than analog audio amplifiers and reduced signal-to-noise ratio. Hence you are going to have to weigh the size of the cordless speakers against the audio fidelity. Having said that, digital amplifiers have come a long way and are providing improved audio fidelity than in the past. Cordless speakers that employ Class-T amps come close to the music fidelity of types that have analog amps. Due to this fact selecting a couple of wireless speakers which employ switching amp with good audio fidelity is now possible.