To help you choose a set of cordless speakers, I will describe the expression "signal-to-noise ratio" which is usually used in order to depict the performance of wireless speakers.
Once you have chosen a number of wireless speakers, it is time to explore several of the specs in more detail to help you narrow down your search to one model. Every wireless loudspeaker will make a certain level of hiss as well as hum. The signal-to-noise ratio will help compute the amount of hiss generated by the loudspeaker.
Comparing the noise level of several sets of cordless speakers may be done rather easily. Just gather a few models that you want to evaluate and short circuit the transmitter audio inputs. Afterward set the wireless speaker gain to maximum and verify the level of noise by listening to the loudspeaker. You are going to hear some amount of hissing and/or hum coming from the speaker. This hiss is generated by the cordless loudspeaker itself. Make sure that the gain of each couple of wireless loudspeakers is set to the same level. Otherwise you will not be able to objectively evaluate the level of noise between different models. The general rule is: the smaller the amount of static that you hear the better the noise performance.
When glancing at the wireless speaker spec sheet, you want to look for a set of cordless speaker with a large signal-to-noise ratio number which indicates that the cordless speakers output a low level of noise. One of the reasons why cordless speakers make noise is the fact that they use components including transistors as well as resistors which by nature create noise. The overall noise depends on how much hiss every component produces. Nonetheless, the location of those elements is also essential. Elements which are part of the loudspeaker built-in amp input stage are going to usually contribute most of the noise.
Hiss is also created by the wireless broadcast. Different types of transmitters are available that work at different frequencies. The cheapest sort of transmitters makes use of FM transmission and usually transmits at 900 MHz. Other cordless transmitters will interfer with FM type transmitters and create further hiss. For that reason the signal-to-noise ratio of FM type wireless speakers changes depending on the distance of the loudspeakers from the transmitter and the level of interference. To avoid these problems, newer transmitters make use of digital audio transmission and usually transmit at 2.4 GHz or 5.8 GHz. This style of music 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 components.
Many recent wireless speakers have built-in power amplifiers that include a power switching stage that switches at a frequency around 500 kHz. This switching frequency is also hiss which is part of the amplified signal. Yet, recent wireless speakerspecifications usually only consider the hiss between 20 Hz and 20 kHz.
The signal-to-noise ratio is measured by feeding a 1 kHz test signal 60 dB below the full scale and measuring the noise floor of the signal generated by the built-in amplifier. The gain of the cordless loudspeaker is pair such that the full output power of the built-in amp can be realized. Next, the noise floor between 20 Hz and 20 kHz is calculated and the ratio to the full-scale signal computed. The noise signal at different frequencies is eliminated by a bandpass filter during this measurement.
Time and again you are going to find the term "dBA" or "a-weighted" in your wireless loudspeaker specification sheet. A weighting is a technique of expressing the noise floor in a more subjective fashion. This method tries to evaluate in how far the wireless speaker noise is perceived by human hearing which is most responsive to signals at frequencies at 1 kHz. An A-weighted signal-to-noise ratio weighs the noise floor according to the human hearing and is generally higher than the unweighted signal-to-noise ratio.
Once you have chosen a number of wireless speakers, it is time to explore several of the specs in more detail to help you narrow down your search to one model. Every wireless loudspeaker will make a certain level of hiss as well as hum. The signal-to-noise ratio will help compute the amount of hiss generated by the loudspeaker.
Comparing the noise level of several sets of cordless speakers may be done rather easily. Just gather a few models that you want to evaluate and short circuit the transmitter audio inputs. Afterward set the wireless speaker gain to maximum and verify the level of noise by listening to the loudspeaker. You are going to hear some amount of hissing and/or hum coming from the speaker. This hiss is generated by the cordless loudspeaker itself. Make sure that the gain of each couple of wireless loudspeakers is set to the same level. Otherwise you will not be able to objectively evaluate the level of noise between different models. The general rule is: the smaller the amount of static that you hear the better the noise performance.
When glancing at the wireless speaker spec sheet, you want to look for a set of cordless speaker with a large signal-to-noise ratio number which indicates that the cordless speakers output a low level of noise. One of the reasons why cordless speakers make noise is the fact that they use components including transistors as well as resistors which by nature create noise. The overall noise depends on how much hiss every component produces. Nonetheless, the location of those elements is also essential. Elements which are part of the loudspeaker built-in amp input stage are going to usually contribute most of the noise.
Hiss is also created by the wireless broadcast. Different types of transmitters are available that work at different frequencies. The cheapest sort of transmitters makes use of FM transmission and usually transmits at 900 MHz. Other cordless transmitters will interfer with FM type transmitters and create further hiss. For that reason the signal-to-noise ratio of FM type wireless speakers changes depending on the distance of the loudspeakers from the transmitter and the level of interference. To avoid these problems, newer transmitters make use of digital audio transmission and usually transmit at 2.4 GHz or 5.8 GHz. This style of music 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 components.
Many recent wireless speakers have built-in power amplifiers that include a power switching stage that switches at a frequency around 500 kHz. This switching frequency is also hiss which is part of the amplified signal. Yet, recent wireless speakerspecifications usually only consider the hiss between 20 Hz and 20 kHz.
The signal-to-noise ratio is measured by feeding a 1 kHz test signal 60 dB below the full scale and measuring the noise floor of the signal generated by the built-in amplifier. The gain of the cordless loudspeaker is pair such that the full output power of the built-in amp can be realized. Next, the noise floor between 20 Hz and 20 kHz is calculated and the ratio to the full-scale signal computed. The noise signal at different frequencies is eliminated by a bandpass filter during this measurement.
Time and again you are going to find the term "dBA" or "a-weighted" in your wireless loudspeaker specification sheet. A weighting is a technique of expressing the noise floor in a more subjective fashion. This method tries to evaluate in how far the wireless speaker noise is perceived by human hearing which is most responsive to signals at frequencies at 1 kHz. An A-weighted signal-to-noise ratio weighs the noise floor according to the human hearing and is generally higher than the unweighted signal-to-noise ratio.
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