jeudi 9 janvier 2014

Advantages Of High-Efficiency Cordless Speakers

By Michelle Jaeger

If you are about to order brand-new wireless loudspeakers, you might be wondering how efficiently your cordless speakers work. I am going to demonstrate just what the expression "power efficiency" stands for and why you ought to take a closer look at this figure in your selection of new wireless speakers.

The less efficient your wireless loudspeakers are, the more power will be wasted which leads to many complications: Low-efficiency wireless speakers are going to waste some power as heat and so are costlier to operate when compared with high-efficiency models because of the larger power usage. Wireless loudspeakers that have lower power efficiency typically have various heat sinks to help dissipate the squandered power. Heat sinks and fans need room and are expensive. The cordless loudspeakers therefore will become fairly big and costly. In addition heat fans will create running noise. In order to help dissipate heat, low-power-efficiency amps need enough air circulation. So they cannot be put in places with no circulation. In addition, they can not be installed inside waterproof enclosures.

Cordless loudspeakers that have small efficiency have to have a larger power source to output the same level of audio power as high-efficiency products. In addition, due to the large level of heat, there will be much greater thermal stress on the electric elements and interior materials that might trigger reliability issues. On the other hand, high-efficiency cordless loudspeakers can be produced small and lightweight.

What is less well-known about efficiency is the fact that this value isn't fixed. The fact is it varies based on how much energy the amp delivers. Therefore in some cases you will discover efficiency figures for different energy levels within the data sheet. Each music amp is going to consume a specific amount of energy regardless of whether or not it supplies any kind of power to the speaker. For that reason the lower the energy the amplifier provides, the lower the power efficiency. As a result audio suppliers typically specify the efficiency for the highest audio power that the amp can provide.

In order to measure the efficiency, typically a test tone of 1 kHz is fed into the amplifier and a power resistor attached to the amp output in order to emulate the speaker load. Next the amp output signal is tested and the wattage calculated which the amplifier provides to the load which is next divided by the overall energy the amp utilizes. Since the efficiency depends upon the audio power, generally the output power is swept and an efficiency curve generated which is able to display the amplifier efficiency for every level of output power.

While selecting a pair of wireless loudspeakers you will have to weigh efficiency versus fidelity given that cordless speakers which utilize low-efficiency analog amplifiers frequently offer the largest audio fidelity while digital models will have greater distortion. A few more sophisticated cordless loudspeakers, for instance products that contain Class-T amplifiers, have the ability to minimize audio distortion to levels close to the ones from models utilizing analog audio amps and in addition can achieve high signal-to-noise ratio. Deciding on one of these kinds of wireless speakers will offer great efficiency and at the same time high audio fidelity.

About the Author:

Aucun commentaire:

Enregistrer un commentaire