Selasa, 26 November 2013

Uncovering The Truth About Recent Wireless Loudspeakers

By Michelle Finger


When buying a brand new set of cordless speakers, you probably are going to take a look at the technical features. An often found specification is the frequency response. This parameter although vital isn't going to tell the entire story pertaining to how great the loudspeakers are going to sound. I will describe the meaning of this phrase and also give some suggestions on how to interpret it when searching for a set of wireless speakers.

Wireless speakers are made to transmit and the reproduce an audio signal to moderate or higher sound level. Manufacturers typically show the frequency range over which the cordless loudspeakers work. Generally a lower and upper frequency are listed, such as 20 Hz - 20 kHz. This particular spec indicates that the cordless speakers can transmit and then reproduce audio within this frequency range. You might think the greater the frequency response the higher quality the cordless speakers. That, however, may not necessarily be the case. You need to check out the specifications more carefully in order to properly understand them all.

However, various producers push this standard to the limit and tend to list an upper frequency where the cordless speakers are going to barely produce a beep anymore. In addition, just taking a look at these 2 numbers isn't going to say a lot concerning the linearity of the frequency response. Ideally you should make an effort to obtain a frequency response chart from the maker. In this diagram, you'll find how the wireless speakers function within the frequency response range. You can even spot any kind of peaks along with valleys the cordless loudspeakers could have. Peaks as well as valleys could cause colorization of the music. If possible the cordless loudspeakers should have a constant sound pressure level inside the entire frequency response with the exception of the drop off at the upper and lower limit. Apart from the frequency response, a phase response diagram will also say a whole lot regarding the performance as well as sound quality of the wireless speakers.

On the other hand, various manufacturers push this standard to the limit and may show an upper frequency where the cordless speakers are going to barely produce a beep any longer. Also, merely examining these 2 figures will not say a lot concerning the linearity of the frequency response. Preferably you should seek to get a frequency response diagram from the maker. In this chart, you will discover how the cordless loudspeakers behave within the frequency response range. Additionally you can spot any kind of peaks and also valleys the wireless speakers could possibly have. Peaks as well as valleys could potentially cause colorization of the music. If possible the wireless loudspeakers needs to have a constant sound pressure level within the complete frequency response apart from the drop off at the upper and lower limit. Apart from the frequency response, a phase response chart will also tell a good deal about the performance as well as quality of sound of the wireless loudspeakers.

This change is most obvious with many wireless loudspeakers that use digital amps, otherwise known as Class-D amps. Class-D amps use a lowpass filter in their output to suppress the switching components which are generated by the internal power FETs. The lowpass filter characteristic, however, heavily varies according to the connected speaker load.

Several amplifiers incorporate feedback to be able to compensate for changes in gain resulting from different connected loads. Different amplifiers make use of transformers and offer outputs for various speaker loads. Apart from improving upon the frequency response of the amp, this approach generally furthermore improves the amplifier power efficiency.




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