Dec 23, 2013

Guidelines For Making An Informed Decision Whilst Searching For Cordless Loudspeakers

By Michelle Finger


The frequency response is by far the most frequently found parameter in order to define cordless loudspeakers. Even so, it may regularly be misleading and might possibly not provide a good indication of the audio quality. I will shed light on the meaning of this phrase and also provide some suggestions on how to interpret it when looking for a set of cordless loudspeakers. A set of cordless speakers are only able to work inside of a particular frequency range. Any kind of signals outside of this range will be removed. As a result the frequency response offers an essential hint with regards to whether a specific set of cordless speakers may be appropriate for a certain use. If the frequency range is 20 Hz to 20 kHz as an example, the cordless loudspeakers could transmit all signals with a frequency greater than 20 Hz and less than 20 kHz. You could possibly be tempted to decide on a set ofwireless speakers which provides the greatest frequency response. On the other hand, there's much more to knowing a cordless loudspeakers's functionality than simply realizing this simple range.

A set of wireless speakers are going to transmit and the reproduce an audio signal that is within the frequency response range. If the frequency range is 20 Hz to 20 kHz as an example, the wireless loudspeakers can transmit any signals with a frequency greater than 20 Hz and less than 20 kHz. You may be tempted to select a set ofwireless speakers that offers the biggest frequency response. However, there's much more to knowing a wireless speakers's performance than simply realizing this simple range.

In reality, a set of wireless loudspeakers that has a frequency response from 10 Hz to 30 kHz might actually have much worse sound quality than a set that offers a frequency response from 20 Hz to 15 kHz. Different suppliers seem to utilize various methods to establish frequency response. The conventional convention is to display the frequency range inside which the sound pressure level of the loudspeakers will drop no more than 3 dB from the nominal level.

In order to better understand the frequency response behavior of a particular model, you should attempt to figure out under which conditions the response was calculated. You may find these details in the data sheet of the wireless loudspeakers. Then again, many makers will not show these in which case you may need to contact the maker directly. The fact is amplifiers could have different frequency responses depending on the loudspeaker driver element which 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 removes switching noise from the speaker amplifier's signal. Yet, the frequency response of the amp now is determined by the loudspeaker driver load because the behavior of this lowpass filter is influenced by the load impedance. Generally the lower the speaker driver load impedance the lower the upper cut-off frequency of the amp

Some of the newest digital amplifiers feed back the audio signal following the lowpass filter in order to compensate for this drawback and also to make the frequency response of the amp independent of the connected driver load. Then again, if the amp is not designed well, this kind of feedback can cause instability and result in loud noise being created by the amp if particular loudspeakers are connected. Yet another method uses audio transformers between the power stage of the amplifier and various outputs. Every output is designed to connect a different loudspeaker load. This method makes sure that the amplifier will be loaded equally and in addition increases amplifier efficiency.




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