A Look At The Frequency Response Expression Of Modern Cordless Loudspeakers
The frequency response is quite possibly the most commonly found parameter in order to characterize wireless speakers. However, it may often be deceptive and might not always give a good indication of the sound quality. I will make clear the meaning of this phrase and also give some recommendations on how to interpret it when looking for a set of cordless loudspeakers.
Cordless loudspeakers are built to transmit and the reproduce a sound signal to medium or higher volume. Manufacturers usually show the frequency range over which the wireless speakers work. This range is specified by listing two frequencies: a lower as well as upper frequency. For example, the lower frequency could be 20 Hz and the upper frequency 20 kHz. Using this spec it appears the wireless loudspeakers could operate as a set of HIFI loudspeakers. You may be thinking the greater the frequency response the better the cordless loudspeakers. That, on the other hand, may not always be the case. You ought to consider the specs more closely so that you can adequately interpret them.
Actually, a set of cordless loudspeakers that has a frequency response from 10 Hz to 30 kHz can actually have much worse sound quality than a set that provides a frequency response from 20 Hz to 15 kHz. Different suppliers appear to employ different methods to define frequency response. The most commonly used method is to describe the frequency response as the frequency range within which the cordless speakers have fairly constant sound pressure level having a highest drop of 3 decibel (dB). Typically the drop in sound pressure level is highest at the lower and upper frequency.
However, many producers dismiss this convention. They push the lower frequency and higher frequency to where the cordless speakers hardly provide any sound response. What’s more, these numbers say absolutely nothing about how linear the wireless speakers are working within this range. Hence it is better to have a complete frequency response graph. Such a chart will reveal whether there are any substantial peaks and / or valleys within the operating frequency range. Peaks along with valleys could potentially cause colorization of the sound. Preferably the sound pressure level of the wireless loudspeakers ought to be linear through the entire operating range.
You additionally will want to look at the circumstances under which the frequency response was measured. You generally are not going to find any kind of information about the measurement conditions, unfortunately, in the manufacturer’s data sheet. The fact is amplifiers could have different frequency responses depending on the loudspeaker driver element that is built in.
The frequency response of Class-D amplifiers shows the largest change with different speaker loads because of the built-in lowpass filter that eliminates switching noise from the speaker amplifier’s signal. However, the frequency response of the amp now depends on the speaker driver load because the behavior of this lowpass filter is influenced by the load impedance. Usually the lower the speaker driver load impedance the lower the upper cut-off frequency of the amplifier
A few of the latest digital amplifiers feed back the music signal following the lowpass filter to be able to compensate for this drawback and also to make the frequency response of the amp independent of the connected driver load. On the other hand, if the amplifier is not designed properly, this type of feedback can cause instability and result in loud noise being generated by the amplifier if particular loudspeakers are attached. An additional technique utilizes audio transformers between the power stage of the amp and several outputs. Every single output was created to attach a different speaker load. This method makes sure that the amplifier will be loaded equally and in addition increases amplifier power efficiency.
You can find further details regarding outdoor speakers as well as wireless surround sound speakers from Amphony’s web site.
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