It is easy to be baffled by the terminology which cordless speaker suppliers employ in order to depict the performance of their products. I am going to clarify the meaning of a usually utilized parameter: "signal-to-noise ratio" in order to help you make an informed decision whilst getting a new a couple of wireless loudspeakers.
Once you have narrowed down your search by glancing at several basic criteria, including the amount of output wattage, the dimensions of the speakers in addition to the cost, you are going to still have quite a few models to choose from. Now it is time to look at a couple of the technical specs in more detail. Every cordless loudspeaker will create a certain level of hiss as well as hum. The signal-to-noise ratio is going to help calculate the amount of noise produced by the speaker.
You can perform a straightforward assessment of the wireless speaker hiss by short circuiting the transmitter input, setting the speaker gain to maximum and listening to the loudspeaker. By and large you will hear two components. The first is hissing. In addition, you will frequently hear a hum at 50 or 60 Hz. Both of these are components which are created by the wireless loudspeaker itself. Next compare several sets of cordless loudspeakers according to the following rule: the lower the amount of noise, the higher the noise performance of the cordless loudspeaker. Yet, keep in mind that you should put all sets of wireless speakers to amplify by the same level to compare several models.
To help you evaluate the noise performance, wireless loudspeaker makers publish the signal-to-noise ratio in their cordless loudspeaker specification sheets. Simply put, the higher the signal-to-noise ratio, the lower the level of noise the wireless speaker generates. There are several reasons why wireless speakers are going to add some form of noise or other unwanted signal. Transistors and resistors that are part of every modern cordless speaker by nature create noise. Typically the components which are located at the input stage of the built-in power amplifier will contribute most to the overall hiss. Thus producers normally are going to choose low-noise components whilst developing the wireless loudspeaker amplifier input stage.
Noise is also brought on by the wireless transmission. Different styles of transmitters are available which work at different frequencies. The cheapest kind of transmitters utilizes FM transmission and commonly broadcasts at 900 MHz. The amount of noise is also dependent upon the amount of wireless interference from other transmitters. Newer models are going to normally utilize digital music broadcast at 2.4 GHz or 5.8 GHz. This type of audio transmission offers larger signal-to-noise ratio than analog style transmitters. The level of static is dependent on the resolution of the analog-to-digital converters along with the quality of other parts.
Most of recent wireless speakers use power amps which are digital, also called "class-d amplifiers". Class-D amps utilize a switching stage that oscillates at a frequency between 300 kHz to 1 MHz. This switching noise may cause some level of loudspeaker distortion but is typically not included in the signal-to-noise ratio which merely considers noise in the range of 20 Hz and 20 kHz.
The most widespread technique for measuring the signal-to-noise ratio is to couple the wireless loudspeaker to a gain which allows the maximum output swing. Then a test tone is fed into the transmitter. The frequency of this signal is typically 1 kHz. The amplitude of this tone is 60 dB underneath the full scale signal. After that the noise-floor energy is calculated in the frequency range between 20 Hz and 20 kHz and compared with the full scale signal energy.
A different convention to express the signal-to-noise ratio utilizes more subjective terms. These terms are "dBA" or "A weighted". You are going to find these terms in the majority of wireless loudspeaker parameter sheets. This technique was developed with the knowledge that human hearing perceives noise at different frequencies differently. Human hearing is most perceptive to signals around 1 kHz. Then again, signals under 50 Hz and above 13 kHz are barely noticed. An A-weighted signal-to-noise ratio weighs the noise floor in accordance to the human hearing and is usually larger than the unweighted signal-to-noise ratio.
Once you have narrowed down your search by glancing at several basic criteria, including the amount of output wattage, the dimensions of the speakers in addition to the cost, you are going to still have quite a few models to choose from. Now it is time to look at a couple of the technical specs in more detail. Every cordless loudspeaker will create a certain level of hiss as well as hum. The signal-to-noise ratio is going to help calculate the amount of noise produced by the speaker.
You can perform a straightforward assessment of the wireless speaker hiss by short circuiting the transmitter input, setting the speaker gain to maximum and listening to the loudspeaker. By and large you will hear two components. The first is hissing. In addition, you will frequently hear a hum at 50 or 60 Hz. Both of these are components which are created by the wireless loudspeaker itself. Next compare several sets of cordless loudspeakers according to the following rule: the lower the amount of noise, the higher the noise performance of the cordless loudspeaker. Yet, keep in mind that you should put all sets of wireless speakers to amplify by the same level to compare several models.
To help you evaluate the noise performance, wireless loudspeaker makers publish the signal-to-noise ratio in their cordless loudspeaker specification sheets. Simply put, the higher the signal-to-noise ratio, the lower the level of noise the wireless speaker generates. There are several reasons why wireless speakers are going to add some form of noise or other unwanted signal. Transistors and resistors that are part of every modern cordless speaker by nature create noise. Typically the components which are located at the input stage of the built-in power amplifier will contribute most to the overall hiss. Thus producers normally are going to choose low-noise components whilst developing the wireless loudspeaker amplifier input stage.
Noise is also brought on by the wireless transmission. Different styles of transmitters are available which work at different frequencies. The cheapest kind of transmitters utilizes FM transmission and commonly broadcasts at 900 MHz. The amount of noise is also dependent upon the amount of wireless interference from other transmitters. Newer models are going to normally utilize digital music broadcast at 2.4 GHz or 5.8 GHz. This type of audio transmission offers larger signal-to-noise ratio than analog style transmitters. The level of static is dependent on the resolution of the analog-to-digital converters along with the quality of other parts.
Most of recent wireless speakers use power amps which are digital, also called "class-d amplifiers". Class-D amps utilize a switching stage that oscillates at a frequency between 300 kHz to 1 MHz. This switching noise may cause some level of loudspeaker distortion but is typically not included in the signal-to-noise ratio which merely considers noise in the range of 20 Hz and 20 kHz.
The most widespread technique for measuring the signal-to-noise ratio is to couple the wireless loudspeaker to a gain which allows the maximum output swing. Then a test tone is fed into the transmitter. The frequency of this signal is typically 1 kHz. The amplitude of this tone is 60 dB underneath the full scale signal. After that the noise-floor energy is calculated in the frequency range between 20 Hz and 20 kHz and compared with the full scale signal energy.
A different convention to express the signal-to-noise ratio utilizes more subjective terms. These terms are "dBA" or "A weighted". You are going to find these terms in the majority of wireless loudspeaker parameter sheets. This technique was developed with the knowledge that human hearing perceives noise at different frequencies differently. Human hearing is most perceptive to signals around 1 kHz. Then again, signals under 50 Hz and above 13 kHz are barely noticed. An A-weighted signal-to-noise ratio weighs the noise floor in accordance to the human hearing and is usually larger than the unweighted signal-to-noise ratio.
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