A Couple Of Insights In Order To Help Understand The Noise Performance Of Latest Digital Amplifiers
by Sherry Lambert
It is easy to be puzzled by the terminology that amplifier producers use to describe the performance of their products. I will clarify the meaning of a commonly utilized amplifier spec: "signal-to-noise ratio" to help you make an informed decision when getting a brand new amplifier.
Comparing the noise level of several amps may be done fairly easily. Simply gather a couple of versions which you want to evaluate and short circuit the inputs. Next set the amp gain to maximum and verify the amount of static by listening to the speaker. Generally 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 generated by the amp itself. Ensure that the volume of the amps is set to the same amount. Otherwise you will not be able to objectively compare the level of noise between different amps. The general rule is: the smaller the amount of hiss that you hear the higher the noise performance.
One technique to accomplish a straightforward test of the noise performance of an amplifier is to short circuit the amplifier input and then to crank up the amplifier to its maximum. Subsequently listen to the loudspeaker which you have connected. The hiss which you hear is generated by the amp itself. Then compare several amplifiers according to the following rule: the smaller the amount of noise, the higher the noise performance of the amplifier. Yet, keep in mind that you must put all amps to amplify by the same level to compare different amps.
While looking at the amp specification sheet, you want to look for an amp with a high signal-to-noise ratio figure which indicates that the amplifier outputs a low level of static. Noise is produced due to a number of factors. One factor is that today's amplifiers all employ components including transistors in addition to resistors. These components are going to produce some amount of hiss. The overall noise depends on how much hiss each component generates. Nonetheless, the position of these elements is also essential. Elements which are part of the amplifier input stage are going to normally contribute the majority of the noise.
Most of modern power amplifiers are digital amplifiers, also known as "class-d amplifiers". Class-D amplifiers utilize a switching stage which oscillates at a frequency between 300 kHz to 1 MHz. This switching frequency is also hiss that is part of the amplified signal. However, modern amp specs typically only consider the noise between 20 Hz and 20 kHz. Makers measure the signal-to-noise ratio by setting the amp such that the full output swing may be realized and by inputting a test tone to the amplifier that is usually 60 dB below the full scale of the amp. Next, the noise floor between 20 Hz and 20 kHz is measured and the ratio to the full-scale signal calculated. The noise signal at other frequencies is eliminated by a bandpass filter throughout this measurement.
Time and again you are going to discover the expression "dBA" or "a-weighted" in your amplifier parameter sheet. A weighting is a method of showing the noise floor in a more subjective fashion. This method attempts to examine in how far the amp noise is perceived by human hearing which is most perceptive to signals at frequencies at 1 kHz. For that reason an A-weighting filter is going to amplify the noise floor for frequencies which are easily heard and suppress the noise floor at frequencies that are hardly noticed. Many amps are going to have a higher A-weighted signal-to-noise ratio than the un-weighted ratio.
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New Unique Article!
Title: A Couple Of Insights In Order To Help Understand The Noise Performance Of Latest Digital Amplifiers
Author: Sherry Lambert
Email: sales@amphony.com
Keywords: speakers,internet,computers,hardware,music,tv set,radio,technology,shopping,product reviews
Word Count: 599
Category: Music
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