Which Versions Of Outdoor Powered Speakers Produce The Smallest Amount Of Noise?
by Linda Cullmann
It is easy to be confused by the language which wireless speaker suppliers use in order to express the performance of their models. I will clarify the meaning of a usually utilized parameter: "signal-to-noise ratio" in order to help you make an informed choice when buying a new a pair of cordless loudspeakers.
When searching for a pair of wireless loudspeakers, you firstly are going to check the cost, wattage among other essential criteria. Yet, after this initial selection, you will still have a number of models to choose from. Next you will focus more on some of the technical specifications, such as signal-to-noise ratio and harmonic distortion. The signal-to-noise ratio is a fairly important specification and explains how much noise or hiss the cordless speaker makes.
Evaluating the noise level of different sets of wireless loudspeakers can be accomplished quite easily. Just gather a couple of products that you want to compare and short circuit the transmitter audio inputs. Afterward set the cordless loudspeaker volume to maximum and check the amount of hiss by listening to the speaker. Typically 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 generated by the wireless speaker itself. After that compare several sets of wireless speakers according to the next rule: the lower the amount of noise, the higher the noise performance of the cordless speaker. On the other hand, keep in mind that you should set all sets of cordless loudspeakers to amplify by the same amount in order to compare different models.
To help you evaluate the noise performance, cordless loudspeaker suppliers publish the signal-to-noise ratio in their wireless speaker spec sheets. Simply put, the higher the signal-to-noise ratio, the smaller the level of noise the wireless speaker generates. Noise is created due to several factors. One reason is that today's cordless loudspeakers all make use of elements such as transistors along with resistors. Those components will generate some amount of hiss. Typically the components that are located at the input stage of the built-in power amplifier are going to contribute most to the overall noise. Consequently suppliers normally are going to choose low-noise elements whilst developing the cordless loudspeaker amplifier input stage.
An additional cause of static is the cordless music broadcast itself. Generally models that make use of FM type broadcast at 900 MHz will have a fairly high amount of static. The level of hiss is also dependent upon the level of wireless interference from other transmitters. Newer models will usually make use of digital music transmission at 2.4 GHz or 5.8 GHz. This type of audio transmission provides larger signal-to-noise ratio than analog type transmitters. The level of hiss is dependent on the resolution of the analog-to-digital converters in addition to the quality of other components.
A lot of of today's wireless loudspeaker use amplifiers which are based on a digital switching architecture. These amplifiers are named "class-D" or "class-T" amps. Switching amplifiers incorporate a power stage that is always switched at a frequency of around 400 kHz. This switching noise can cause a certain amount of speaker distortion yet is typically not included in the signal-to-noise ratio which merely considers noise in the range of 20 Hz and 20 kHz.
The signal-to-noise ratio is measured by feeding a 1 kHz test tone 60 dB underneath the full scale and measuring the noise floor of the signal generated by the built-in amplifier. The amplification of the cordless loudspeaker is pair such that the full output power of the built-in amplifier can be achieved. 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.
Frequently the signal-to-noise ratio is shown in a more subjective method as "dbA" or "A weighted". This method was developed with the knowledge that human hearing perceives noise at different frequencies differently. Human hearing is most sensitive to signals around 1 kHz. Though, signals under 50 Hz and higher than 13 kHz are barely noticed. The A-weighted signal-to-noise ratio is generally higher than the unweighted ratio and is shown in most cordless speaker specification sheets.
Go to this <a href="http://www.amphony.com/products/wireless-speaker.htm">informative post</a> to help you read through further infos about outdoor audio speakers.
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New Unique Article!
Title: Which Versions Of Outdoor Powered Speakers Produce The Smallest Amount Of Noise?
Author: Linda Cullmann
Email: sales@amphony.com
Keywords: speakers,internet,computers,hardware,music,tv set,radio,technology,shopping,product reviews
Word Count: 700
Category: Music
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