Saturday, December 21, 2013

Discovering The Truth About Recent Wireless Speakers

By Michelle Finger


The frequency response is by far the most frequently found parameter in order to characterize cordless loudspeakers. However, it may often be misleading and may not really offer a good indication of the audio quality. You might not fully grasp how the frequency response is determined. I'm going to explain what specifically this specific expression means. I hope you will be able to make a more knowledgeable buying decision. Cordless loudspeakers are made to transmit and the reproduce a music signal to moderate or high sound level. Producers usually show the frequency range over which the wireless speakers function. Typically a lower and upper frequency are listed, such as 20 Hz - 20 kHz. This kind of spec indicates that the wireless loudspeakers will be able to transmit and then reproduce audio inside of this frequency range. Then again, there is certainly far more to understanding the wireless loudspeakers's overall performance than simply reviewing these numbers.

A set of cordless loudspeakers are going to transmit and the reproduce an audio signal which is within the frequency response range. If the frequency range is 20 Hz to 20 kHz for example, the wireless speakers could transmit all signals with a frequency greater than 20 Hz and less than 20 kHz. You may be thinking the greater the frequency response the higher quality the cordless loudspeakers. That, on the other hand, may well not necessarily be the case. You ought to look at the specs far more meticulously to correctly interpret these.

However, several makers overlook this established practice. They push the lower frequency and upper frequency to where the cordless loudspeakers barely offer any sound response. What's more, these figures say practically nothing about precisely how linear the cordless loudspeakers are working inside this range. A complete frequency response graph, however, will demonstrate whether or not there are any kind of peaks or valleys and in addition show how the frequency response is to be interpreted. You may additionally want to request a phase response chart which also presents important hints regarding the sound quality.

To better comprehend the frequency response behavior of a specific model, you should try to figure out under which conditions the response was calculated. You will probably find this information in the data sheet of the wireless loudspeakers. Then again, most makers will not publish those in which case you ought to get in touch with the manufacturer directly. One condition which might effect the frequency response is the impedance of the loudspeaker driver built into the cordless loudspeakers. Normal loudspeaker driver impedances range from 2 to 16 Ohms. The lower the speaker driver impedance the higher the strain for the internal amplifier.

This change is most apparent with most cordless loudspeakers that use digital amplifiers, also referred to as Class-D amps. Class-D amplifiers employ a lowpass filter in their output in order to suppress the switching components which are created by the internal power FETs. The lowpass filter characteristic, however, greatly varies according to the connected speaker load.

Some amplifiers integrate feedback to compensate for changes in gain due to different attached loads. An additional approach utilizes audio transformers between the power stage of the amplifier and various outputs. Every output was designed to connect a different speaker load. This approach makes sure that the amplifier is going to be loaded equally and in addition improves amplifier power efficiency.




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