lundi 9 décembre 2013

A Look At The Frequency Response Specification Of Today's Wireless Loudspeakers

By Michelle Finger


When buying a brand new set of wireless loudspeakers, you probably are going to take a look at the technical features. One often found spec is the frequency response. This spec whilst essential isn't going to tell the full story pertaining to how well the loudspeakers will sound. I am going to shed light on the meaning of this expression and even provide some suggestions on how to interpret it when searching for a set of cordless speakers.

A set of wireless loudspeakers are going to transmit and the reproduce a sound signal that is within the frequency response range. Generally a lower and upper frequency are shown, like 20 Hz - 20 kHz. This kind of specification suggests that the cordless speakers are able to transmit and then reproduce music inside this frequency range. It might seem the greater the frequency response the higher quality the cordless loudspeakers. That, on the other hand, might not necessarily be the case. You ought to evaluate the specs a lot more meticulously to be able to properly interpret all of them.

A large frequency response doesn't mean the wireless loudspeakers offer good audio quality. By way of example a set of cordless speakers which has a frequency response between 30 Hz and 15 kHz might sound better than another set having a response between 10 Hz and 30 kHz. Moreover, every producer, it appears, uses a different way of specifying the lowest and maximum frequency of their cordless loudspeakers. The most popular way is to describe the frequency response as the frequency range within which the cordless loudspeakers have fairly constant sound pressure level having a greatest drop of 3 decibel (dB). Normally the drop in sound pressure level is greatest at the lower and upper frequency. On the other hand, various suppliers push this standard to the limit and often will list an upper frequency where the wireless loudspeakers are going to barely create a beep anymore. Additionally, just reviewing these 2 figures does not say much concerning the linearity of the frequency response. A full frequency response chart, on the other hand, will demonstrate whether or not there are any kind of peaks or valleys and also show the way the frequency response is to be understood. Peaks along with valleys could cause colorization of the sound. Preferably the sound pressure level of the cordless speakers ought to be linear through the entire working range.

You also need to look at the conditions under which the frequency response was determined. You typically will not find any kind of specifics about the measurement conditions, however, in the producer's data sheet. The fact is that numerous amps which are incorporated into the cordless speakers are going to work in a different way with different speaker loads. This is due to the fact that various speaker loads will result in changes to the behavior of the output power stage of the amplifier.

The conditions under which the frequency response was measured may also be essential to comprehend. The fact is that numerous amplifiers which are incorporated into the wireless loudspeakers will work in a different way with different speaker loads. This is mainly because that different speaker loads can cause changes to the behavior of the output power stage of the amp. This change is most noticeable with most cordless speakers that use digital amps, also referred to as Class-D amplifiers. Class-D amplifiers employ a lowpass filter within their output to reduce the switching components that are produced from the internal power FETs. The lowpass filter characteristic, however, greatly depends on the connected speaker load.

Several amps incorporate feedback as a way to compensate for changes in gain caused by different attached loads. Other amplifiers use transformers and provide outputs for various loudspeaker loads. Aside from improving upon the frequency response of the amplifier, this technique typically additionally enhances the amplifier efficiency.




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