To help you pick a set of wireless speakers, I am going to describe the expression "signal-to-noise ratio" which is commonly utilized in order to depict the performance of cordless loudspeakers.
Once you have selected a number of wireless loudspeakers, it is time to investigate several of the specifications in more detail to help you narrow down your search to one product. Every cordless loudspeaker will make a certain amount of hiss and hum. The signal-to-noise ratio will help compute the amount of hiss generated by the speaker.
A way in order to accomplish a simple test of the noise performance of a pair of wireless loudspeakers is to short circuit the transmitter audio input and then to crank up the cordless speaker to its utmost. Then listen to the loudspeaker. The static which you hear is created by the cordless speaker itself. Then compare several sets of wireless speakers according to the next rule: the smaller the amount of noise, the higher the noise performance of the wireless loudspeaker. On the other hand, keep in mind that you have to set all sets of wireless loudspeakers to amplify by the same level to evaluate different models.
While taking a look at the wireless speaker spec sheet, you want to look for a set of cordless loudspeaker with a large signal-to-noise ratio figure which suggests that the wireless loudspeakers output a low level of static. One of the reasons why cordless loudspeakers produce noise is the fact that they utilize components including transistors and resistors that by nature create noise. As the built-in power amplifier overall noise performance is mostly determined by the performance of components situated at the amp input, makers are going to attempt to choose low-noise parts when designing the amplifier input stage of their cordless loudspeakers.
One more cause of hiss is the wireless audio transmission itself. Usually types that employ FM type transmission at 900 MHz are going to have a fairly large level of noise. FM transmitters are very prone to wireless interference which is why newer models usually utilize digital audio broadcast. The signal-to-noise ratio of digital transmitters depends mostly on the kind of analog-to-digital converters and other components that are used and also the resolution of the wireless protocol.
Many of today's wireless loudspeaker use amps which are based on a digital switching architecture. These amplifiers are referred to as "class-D" or "class-T" amplifiers. Switching amplifiers include a power stage which is continuously switched at a frequency of around 400 kHz. Because of this, the output signal of wireless loudspeaker switching amplifiers exhibit a moderately large amount of switching noise. This noise component, though, is typically inaudible since it is well above 20 kHz. On the other hand, it may 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 wireless loudspeaker amplifiers in order to remove the switching noise.
The most common technique for measuring the signal-to-noise ratio is to set the wireless speaker to a gain that allows the maximum output swing. Subsequently a test signal is input into the transmitter. The frequency of this tone is usually 1 kHz. The amplitude of this signal is 60 dB below the full scale signal. After that, the noise floor between 20 Hz and 20 kHz is calculated 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". This method attempts to evaluate in how far the wireless loudspeaker noise is perceived by human hearing which is most responsive to signals at frequencies at 1 kHz. The A-weighted signal-to-noise ratio is typically larger than the unweighted ratio and is shown in the majority of wireless loudspeaker spec sheets.
Once you have selected a number of wireless loudspeakers, it is time to investigate several of the specifications in more detail to help you narrow down your search to one product. Every cordless loudspeaker will make a certain amount of hiss and hum. The signal-to-noise ratio will help compute the amount of hiss generated by the speaker.
A way in order to accomplish a simple test of the noise performance of a pair of wireless loudspeakers is to short circuit the transmitter audio input and then to crank up the cordless speaker to its utmost. Then listen to the loudspeaker. The static which you hear is created by the cordless speaker itself. Then compare several sets of wireless speakers according to the next rule: the smaller the amount of noise, the higher the noise performance of the wireless loudspeaker. On the other hand, keep in mind that you have to set all sets of wireless loudspeakers to amplify by the same level to evaluate different models.
While taking a look at the wireless speaker spec sheet, you want to look for a set of cordless loudspeaker with a large signal-to-noise ratio figure which suggests that the wireless loudspeakers output a low level of static. One of the reasons why cordless loudspeakers produce noise is the fact that they utilize components including transistors and resistors that by nature create noise. As the built-in power amplifier overall noise performance is mostly determined by the performance of components situated at the amp input, makers are going to attempt to choose low-noise parts when designing the amplifier input stage of their cordless loudspeakers.
One more cause of hiss is the wireless audio transmission itself. Usually types that employ FM type transmission at 900 MHz are going to have a fairly large level of noise. FM transmitters are very prone to wireless interference which is why newer models usually utilize digital audio broadcast. The signal-to-noise ratio of digital transmitters depends mostly on the kind of analog-to-digital converters and other components that are used and also the resolution of the wireless protocol.
Many of today's wireless loudspeaker use amps which are based on a digital switching architecture. These amplifiers are referred to as "class-D" or "class-T" amplifiers. Switching amplifiers include a power stage which is continuously switched at a frequency of around 400 kHz. Because of this, the output signal of wireless loudspeaker switching amplifiers exhibit a moderately large amount of switching noise. This noise component, though, is typically inaudible since it is well above 20 kHz. On the other hand, it may 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 wireless loudspeaker amplifiers in order to remove the switching noise.
The most common technique for measuring the signal-to-noise ratio is to set the wireless speaker to a gain that allows the maximum output swing. Subsequently a test signal is input into the transmitter. The frequency of this tone is usually 1 kHz. The amplitude of this signal is 60 dB below the full scale signal. After that, the noise floor between 20 Hz and 20 kHz is calculated 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". This method attempts to evaluate in how far the wireless loudspeaker noise is perceived by human hearing which is most responsive to signals at frequencies at 1 kHz. The A-weighted signal-to-noise ratio is typically larger than the unweighted ratio and is shown in the majority of wireless loudspeaker spec sheets.