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Getting To Know The Output Wattage Parameter Of Recent Stereo Amplifiers

Considering a few of the technical specs of recent power amps, one cannot help but be at a loss in attempting to compare different models and technical jargon, such as “t amp models”, “THD” and so on. I am going to clarify the term “amplifier wattage” a bit more in this editorial. “Output power” is one of the most fundamental terms describing amplifier functioning. Nonetheless, it is frequently misunderstood. A number of suppliers also in the past have used this term in a perplexing way to conceal the real performance.

A number of of the technical jargon which amplifier suppliers show often are confusing and do not inevitably give a decent indication of the real performance of the amplifier. Let me now proceed and explain the power spec of power amps.

“Wattage” describes how loud your amp may drive your loudspeakers. If you own a small room then you don’t need much more than a few watts. If you wish to install loudspeakers outside or in a concert then you will need several hundred watts of power. For superior music quality, you may wish to choose an amplifier that has higher power than you require as many amplifiers are going to show rising distortion as the music output power increases.

Output power is either given as “Watts peak” which means the amplifier may create brief bursts of this level of power or “Watts rms” which describes how much power the amp can offer for a longer amount of time. In the past, vendors have regularly preferred displaying the “peak power”. This figure is higher than the average or “rms” power. On the other hand, “peak power” can frequently be ambiguous since there is no standard stating the period of time that the amplifier must be able to output this amount of output power.

Nonetheless, whilst the rms rating is going to tell you more about the amplifier’s actual performance, be sure though that the amp offers a peak power rating which is substantially bigger than the rms spec. This is because most likely you are going to be using the amp to amplify music or voice. Music and voice signals inherently always fluctuate in terms of their power, i.e. the power envelope of the audio will change over time. Having sufficient headroom is crucial because audio signals differ a great deal from sine wave signals which are used to determine rms output power. Short bursts of large power are frequently found in music signals. These peaks are going to drive the amplifier into large distortion unless the peak power is big enough.

Usually the impedance of the loudspeakers which you connect to the amp is going to determine how much power the amplifier can offer. Speaker impedance is measured in Ohms. Typically speakers have an impedance between 4 and 8 Ohms. Resulting from the limited amplifier supply voltage, the maximum output power will be half when you attach an 8-Ohm speaker of the peak power which the amplifier may output to a 4-Ohm speaker. If the highest power is not referenced to a speaker impedance, you should call the maker. Typically a 4-Ohm loudspeaker is used as a reference.