Some Practical Pointers For Finding A Set Of Cordless Speakers

It is easy to be perplexed by the language which cordless speaker manufacturers utilize in order to express the performance of their models

. I am going to clarify the meaning of one usually used specification: "signal-to-noise ratio" to help you make an informed decision while getting a new a set of cordless loudspeakers.

As soon as you have selected a number of cordless speakers, it's time to explore a few of the specifications in more detail in order to help you narrow down your search to one model. Every wireless loudspeaker will create a certain level of hiss as well as hum. The signal-to-noise ratio will help calculate the level of noise produced by the speaker.

You can perform a simple comparison of the cordless loudspeaker noise by short circuiting the transmitter input, setting the speaker volume to maximum and listening to the loudspeaker. The static that you hear is produced by the wireless loudspeaker itself. After that compare several sets of cordless loudspeakers according to the next rule: the smaller the amount of noise, the better the noise performance of the cordless speaker. On the other hand, keep in mind that you must put all sets of cordless speakers to amplify by the same level to compare several models.

In order to help you compare the noise performance, cordless loudspeaker manufacturers publish the signal-to-noise ratio in their wireless speaker specification sheets. Simply put, the larger the signal-to-noise ratio, the smaller the amount of noise the wireless speaker creates. Noise is created due to several factors. One reason is that today's cordless loudspeakers all make use of components such as transistors along with resistors. Those elements are going to produce some amount of noise. The overall noise is dependent on how much hiss every component creates. Yet, the position of those elements is also important. Components which are part of the loudspeaker built-in amp input stage are going to usually contribute most of the noise.

The cordless transmission itself also will cause noise that is most noticable with types that make use of FM transmission at 900 MHz. Other cordless transmitters are going to interfer with FM type transmitters and create additional hiss. For that reason the signal-to-noise ratio of FM style wireless speakers changes depending on the distance of the speakers from the transmitter plus the level of interference. To steer clear of these problems, modern transmitters employ digital audio transmission and usually transmit at 2.4 GHz or 5.8 GHz. This style of music broadcast offers higher signal-to-noise ratio than analog type transmitters. The level of noise depends on the resolution of the analog-to-digital converters in addition to the quality of other parts.

A lot of latest cordless loudspeakers have built-in power amps that incorporate a wattage switching stage that switches at a frequency around 500 kHz. In consequence, the output signal of wireless loudspeaker switching amps contain a moderately large amount of switching noise. This noise component, however, is generally impossible to hear given that it is well above 20 kHz. Though, it can still contribute to speaker distortion. Signal-to-noise ratio is typically only shown within the range of 20 Hz to 20 kHz. Thus, a lowpass filter is used while measuring cordless speaker amps to eliminate the switching noise.

Producers measure the signal-to-noise ratio by setting the built-in amplifier such that the full output swing may be realized and by feeding a test signal to the transmitter which is normally 60 dB underneath the full scale of the speaker amplifier. Next, the noise floor between 20 Hz and 20 kHz is measured and the ratio to the full-scale signal computed. The noise signal at other frequencies is removed via a bandpass filter throughout this measurement.

Time and again the signal-to-noise ratio is shown in a more subjective way as "dbA" or "A weighted". In other words, this method tries to express how the noise is perceived by a person. Human hearing is most perceptive to signals around 1 kHz whereas signals below 50 Hz and above 14 kHz are barely heard. The A-weighted signal-to-noise ratio is typically larger than the unweighted ratio and is published in a lot of wireless loudspeaker parameter sheets.

by: articlewriter13781

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