To help you pick a pair of wireless loudspeakers, I will describe the term "signal-to-noise ratio" which is regularly utilized to explain the performance of wireless loudspeakers.
While trying to find a pair of wireless speakers, you first are going to check the cost, wattage amid additional basic criteria. However, after this initial choice, you are going to still have several models to choose from. Next you are going to concentrate more on several of the technical specifications, like signal-to-noise ratio and harmonic distortion. Each wireless loudspeaker is going to generate a certain level of hiss as well as hum. The signal-to-noise ratio is going to help quantify the level of hiss generated by the speaker.
You can do a straightforward comparison of the wireless speaker hiss by short circuiting the transmitter input, setting the speaker volume to maximum and listening to the loudspeaker. By and large you will hear 2 components. The first is hissing. In addition, you will regularly hear a hum at 50 or 60 Hz. Both of these are components which are created by the wireless loudspeaker itself. Be certain that the gain of each set of wireless loudspeakers is pair to the same amount. Otherwise you will not be able to objectively evaluate the level of hiss between different models. The general rule is: the lower the level of static that you hear the higher the noise performance.
If you prefer a couple of wireless speakers with a small amount of hissing, you may look at the signal-to-noise ratio figure of the spec sheet. Most suppliers will show this figure. cordless speakers with a large signal-to-noise ratio will output a low level of static. Noise is created due to several factors. One factor is that modern wireless loudspeakers all utilize components such as transistors along with resistors. These components will generate some amount of noise. Because the built-in power amplifier overall noise performance is mostly determined by the performance of components located at the amp input, producers are going to try to select low-noise components whilst designing the amplifier input stage of their cordless speakers.
The cordless broadcast itself also causes noise that is most noticable with models which make use of FM transmission at 900 MHz. The level of hiss is also dependent upon the amount of wireless interference from other transmitters. Modern products are going to usually make use of digital music transmission at 2.4 GHz or 5.8 GHz. This type of audio broadcast offers better signal-to-noise ratio than analog type transmitters. The amount of static depends on the resolution of the analog-to-digital converters and also the quality of other parts.
Many of latest cordless loudspeaker use amplifiers which are based on a digital switching topology. These amplifiers are known as "class-D" or "class-T" amplifiers. Switching amplifiers include a power stage which is always switched at a frequency of around 400 kHz. Consequently, the output signal of wireless speaker switching amps exhibit a fairly big amount of switching noise. This noise component, though, is usually impossible to hear because it is well above 20 kHz. Nonetheless, it may still contribute to loudspeaker distortion. Signal-to-noise ratio is usually only shown within the range of 20 Hz to 20 kHz. Thus, a lowpass filter is used when measuring cordless speaker amplifiers to remove the switching noise.
The most common method for measuring the signal-to-noise ratio is to pair the cordless loudspeaker to a gain that enables the maximum output swing. Subsequently a test tone is fed into the transmitter. The frequency of this tone is usually 1 kHz. The amplitude of this signal is 60 dB underneath the full scale signal. Subsequently, only the noise in the range of 20 Hz and 20 kHz is considered. The noise at other frequencies is removed by a filter. After that the amount of the noise energy in relation to the full-scale output power is computed and expressed in decibel.
Frequently the signal-to-noise ratio is expressed in a more subjective method as "dbA" or "A weighted". This technique tries to examine in how far the cordless speaker noise is perceived by human hearing which is most sensitive to signals at frequencies at 1 kHz. The A-weighted signal-to-noise ratio is frequently larger than the unweighted ratio and is published in the majority of cordless speaker specification sheets.
While trying to find a pair of wireless speakers, you first are going to check the cost, wattage amid additional basic criteria. However, after this initial choice, you are going to still have several models to choose from. Next you are going to concentrate more on several of the technical specifications, like signal-to-noise ratio and harmonic distortion. Each wireless loudspeaker is going to generate a certain level of hiss as well as hum. The signal-to-noise ratio is going to help quantify the level of hiss generated by the speaker.
You can do a straightforward comparison of the wireless speaker hiss by short circuiting the transmitter input, setting the speaker volume to maximum and listening to the loudspeaker. By and large you will hear 2 components. The first is hissing. In addition, you will regularly hear a hum at 50 or 60 Hz. Both of these are components which are created by the wireless loudspeaker itself. Be certain that the gain of each set of wireless loudspeakers is pair to the same amount. Otherwise you will not be able to objectively evaluate the level of hiss between different models. The general rule is: the lower the level of static that you hear the higher the noise performance.
If you prefer a couple of wireless speakers with a small amount of hissing, you may look at the signal-to-noise ratio figure of the spec sheet. Most suppliers will show this figure. cordless speakers with a large signal-to-noise ratio will output a low level of static. Noise is created due to several factors. One factor is that modern wireless loudspeakers all utilize components such as transistors along with resistors. These components will generate some amount of noise. Because the built-in power amplifier overall noise performance is mostly determined by the performance of components located at the amp input, producers are going to try to select low-noise components whilst designing the amplifier input stage of their cordless speakers.
The cordless broadcast itself also causes noise that is most noticable with models which make use of FM transmission at 900 MHz. The level of hiss is also dependent upon the amount of wireless interference from other transmitters. Modern products are going to usually make use of digital music transmission at 2.4 GHz or 5.8 GHz. This type of audio broadcast offers better signal-to-noise ratio than analog type transmitters. The amount of static depends on the resolution of the analog-to-digital converters and also the quality of other parts.
Many of latest cordless loudspeaker use amplifiers which are based on a digital switching topology. These amplifiers are known as "class-D" or "class-T" amplifiers. Switching amplifiers include a power stage which is always switched at a frequency of around 400 kHz. Consequently, the output signal of wireless speaker switching amps exhibit a fairly big amount of switching noise. This noise component, though, is usually impossible to hear because it is well above 20 kHz. Nonetheless, it may still contribute to loudspeaker distortion. Signal-to-noise ratio is usually only shown within the range of 20 Hz to 20 kHz. Thus, a lowpass filter is used when measuring cordless speaker amplifiers to remove the switching noise.
The most common method for measuring the signal-to-noise ratio is to pair the cordless loudspeaker to a gain that enables the maximum output swing. Subsequently a test tone is fed into the transmitter. The frequency of this tone is usually 1 kHz. The amplitude of this signal is 60 dB underneath the full scale signal. Subsequently, only the noise in the range of 20 Hz and 20 kHz is considered. The noise at other frequencies is removed by a filter. After that the amount of the noise energy in relation to the full-scale output power is computed and expressed in decibel.
Frequently the signal-to-noise ratio is expressed in a more subjective method as "dbA" or "A weighted". This technique tries to examine in how far the cordless speaker noise is perceived by human hearing which is most sensitive to signals at frequencies at 1 kHz. The A-weighted signal-to-noise ratio is frequently larger than the unweighted ratio and is published in the majority of cordless speaker specification sheets.
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