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Exactly How Much Power Do You Require From Your Small Amps?

Thursday, January 2, 2014

By Sherry Lambert


Choosing the ideal type is tricky whilst confronted with a big array of different technical jargon in addition to specs, such as "T-amp", "channel separation", "efficiency" and so forth. You might not even fully know the most basic of these terms, such as "amplifier wattage". I am going to offer a short summary of the output wattage specification so as to help you better know the significance of this term and how it relates to the performance of an amplifier.

A quantity of of the terms which amplifier producers make public frequently are confusing and do not necessarily offer a decent indication of the real performance of the amplifier. Now I am going to provide several fine points about "amplifier output power". This term is often misunderstood. It is vital to look quite closely at how the manufacturer shows this parameter.

"Power" describes how loud your amp can drive your loudspeakers. Based on your application, you may go with a tiny amplifier offering only a few watts or a larger one offering several hundred watts. Many home radios only have amps which have a few watts power which typically is sufficient for a small space. If you intend to shake your walls then you clearly want to choose an amplifier that offers up to several hundred watts. For best music quality, you might wish to choose an amp that offers more output power than you require because many amps will exhibit increasing distortion as the music power goes up.

Today many amplifiers will specify rms power that gives a better indication of the amplifier's real performance. However, please make sure that your amp offers adequate headroom to steer clear of clipping of the audio. The most important reason is that music signals will have short peaks of high power which the amp has to deal with. Rms power is measured with a uniform sine wave that hardly compares with a music signal regarding the power envelope.

Usually the impedance of the loudspeakers which you connect to the amp is going to determine how much power the amplifier may deliver. Speaker impedance is measured in Ohms. Normally speakers have an impedance between 4 and 8 Ohms. Amps have a restricted output voltage swing because of the fixed internal supply voltage. Hence the largest output power will differ depending on the loudspeaker impedance. The smaller the speaker impedance the higher the highest power the amp is able to deliver. Regularly highest output power is specified for a 4-Ohm loudspeaker impedance. Though, ideally the producer will show which speaker impedance the output power spec is being referenced to. Please note that a number of amps cannot drive loudspeakers with very low speaker impedance.




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