Several Unknown Details About Today's Wireless Loudspeakers

By Michelle Finger


Wireless loudspeaker vendors typically publish the frequency response of their products that, however, won't automatically tell you a lot regarding the sound quality. You might not fully understand exactly how the frequency response is determined. Let me explain what specifically this particular term means. Ideally you'll be able to make a much more knowledgeable purchasing decision. A set of wireless speakers are only able to work within a specific frequency range. Any signals outside this range will be eliminated. As such the frequency response provides an important clue regarding if a certain set of wireless loudspeakers could be suitable for a particular application. If the frequency range is 20 Hz to 20 kHz for example, the cordless speakers can transmit any signals with a frequency greater than 20 Hz and lower than 20 kHz. You may think the greater the frequency response the higher quality the wireless speakers. That, however, may not always be the case. You should check out the specs much more closely in order to properly understand them all.

Wireless loudspeakers are meant to transmit and the reproduce an audio signal to medium or large sound level. Suppliers normally present the frequency range over which the wireless speakers function. Generally a lower and upper frequency are given, for instance 20 Hz - 20 kHz. This kind of spec suggests that the cordless speakers will be able to transmit and then reproduce music inside of that frequency range. However, there is certainly much more to understanding the cordless loudspeakers's overall performance than simply taking a look at these numbers.

Yet, the frequency response quite often is utilized to misinform customers by way of stretching out the frequency range a great deal beyond the range in which the cordless speakers still function properly and in addition covers up the fact that the wireless loudspeakers aren't linear. A full frequency response chart, however, will demonstrate whether or not there are any kind of peaks and valleys and in addition show how the frequency response is to be interpreted. Peaks and also valleys can cause colorization of the sound. Ideally the sound pressure level of the cordless loudspeakers needs to be linear through the entire operating range.

You furthermore need to look at the conditions under which the frequency response was calculated. You generally won't find any specifics about the measurement conditions, however, in the producer's data sheet. The fact is that lots of amplifiers which are incorporated into the wireless speakers will behave differently with different loudspeaker loads. This is mainly because that various speaker loads will cause changes to the behavior of the output power stage of the amp.

Generally contemporary cordless loudspeakers which use digital or "Class-D" amps can have changes in the frequency response with different driver loads. The main reason is the fact that Class-D amplifiers employ switching FETs as the power stage that produce quite a lot of switching components. These components are removed using a filter which is part of the internal speaker amp. A varying loudspeaker driver load is going to affect the filter response to a point. Commonly the lower the loudspeaker driver impedance the lower the highest frequency of the built-in amplifier. Moreover, the linearity of the amplifier gain is going to depend on the driver load.

A few amps incorporate feedback in order to compensate for changes in gain resulting from different attached loads. Other amplifiers utilize transformers and provide outputs for various speaker loads. Aside from improving upon the frequency response of the amp, this method usually also enhances the amplifier power efficiency.




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