By Sherry Lambert


Contemplating several of the technical specifications of recent power amplifiers, one cannot help but be at a loss in attempting to compare different products as well as terms, for example "t-amp", "THD" and so on. In this commentary, I am going to have a glimpse at one of the most basic of these terms: "amplifier output wattage". This term is also called "wattage". If you are looking to purchase an audio amplifier in order to install your home speakers, you will often be confronted with a number of weird technical jargon describing its performance. But how do these numbers relate to how the audio amplifier sounds and how are these to be interpreted? Next I will give a number of details concerning "amplifier power". This term is frequently misunderstood. It is important to look fairly closely at how the producer publishes this parameter.

A number of of the technical jargon which amp companies publish often are deceptive and do not inevitably provide a good indication of the real performance of the amp. Next I am going to give various details about "amplifier wattage". This term is often misunderstood. It is important to look rather closely at how the maker publishes this parameter. "Wattage" is from time to time also known as "Power" or "amplifier output power". To put it in a nutshell, "wattage" relates to how high the amp can drive your speakers. The higher this figure the louder your loudspeakers. If you own a small space then you don't require much more than several watts. If you wish to install loudspeakers outdoors or in a live show then you will need several hundred watts of power. Please note that numerous amplifiers will start distorting the audio once the audio reaches bigger wattage. If you want to enjoy low-distortion audio then you might want to choose an amplifier that is going to offer you more wattage than you will actually need.

There are 2 widespread methods to publish amplifier power. These are "peak power" and "rms power". "Peak power" describes how much wattage the amp may offer to your loudspeakers for a short burst. Alternatively, "rms power" describes how much power the amp can deliver for a prolonged amount of time without being damaged. The peak output power rating in the past often led to makers listing huge wattage specs for small amplifiers. On the other hand, in practice these amps would not be able to maintain bigger levels of output power for larger periods of time.

There are two widespread ways to show amplifier wattage. These are "peak power" and "rms power". "Peak power" describes how much power the amp may offer to your speakers for a short burst. On the other hand, "rms power" describes how much power the amp can deliver for a longer amount of time without being damaged. The peak wattage rating in the past habitually led to producers listing large wattage ratings for small amplifiers. However, in reality these amplifiers would not be able to sustain larger levels of output power for larger periods of time. Still, whereas the rms specification will tell you more about the amplifier's true performance, be certain though that the amp offers a peak power specification that is quite a bit bigger than the rms rating. This is because most likely you will be using the amp to amplify music or voice. Music and voice signals inherently always vary in terms of their power, i.e. the power envelope of the audio is going to change over time. Having adequate headroom is essential since audio signals differ a great deal from sine wave signals that are used to determine rms output power. Brief peaks of high power are often found in audio signals. These bursts are going to drive the amplifier into large distortion unless the peak power is large enough.

Typically the impedance of the loudspeakers which you connect to the amp is going to determine how much power the amp can output. Speaker impedance is measured in Ohms. Usually loudspeakers have an impedance between 4 and 8 Ohms. Because of the limited amplifier supply voltage, the maximum output wattage will be half if you connect an 8-Ohm speaker of the peak power that the amplifier may deliver to a 4-Ohm speaker. Consequently frequently maximum output power is shown for a specific speaker impedance.




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