Information For Spotting The Ideal Audio Amplifier
I will have a look at a few audio amplifiers as well as mini amplifier models and explain some fundamental expressions to aid you choose the best amp for your loudspeakers
Audio amps are available in all different shapes and sizes. They use different technologies and have countless technical specs. This makes it hard to decide which type to pick. You don’t have to be an expert. Just follow some plain suggestions and you should be satisfied with your amplifier.
The most obvious criterion is the size of the amp. There are models that are as large as half your living room while several of the latest mini amplifier types are as tiny as a bar of soap. A large number of amps are the size of a typical rack. This permits your amp to be stacked on top of your other audio equipment.
The vast majority of modern audio amplifiers are solid state amplifiers vs more conventional tube amps. Tube amps have been prevalent a decade or so ago. Tube amplifiers, on the other hand, have a relatively high amount of harmonic distortion. Harmonic distortion refers to how much the audio signal is degraded while being amplified. This term is frequently used while evaluating the audio quality of amplifiers.
Tube amplifiers will have audio distortion of up to 10%. Solid state amps will have lower audio distortion depending on the amplifier technology that is utilized. Some of the most accepted technologies in the past have been "Class-A" and "Class-AB" technologies. These technologies use different arrangements to amplify the audio. Amps based on any of these technologies are also known as "analog amplifiers". This technology offers fairly small audio distortion. However, the power efficiency is only 10 to 30%. This means that the majority of the electrical power supplied to the amp is wasted as heat while a tiny fraction is utilized to amplify the audio signal.
"Class-D" amplifiers, however, which are also called "digital amplifiers" have a power efficiency of at least 80% and are smaller and have a smaller power supply than similar analog amplifiers. Because of the switching output stage, digital amps usually have larger harmonic distortion than analog amplifiers. On the other hand, a number of of the most recent models are able to reduce distortion to 0.05% and lower by using a feedback mechanism.
When picking an amplifier, make certain that the output power is sufficient to drive your loudspeakers. The needed power will be determined by how much power your speakers can handle as well as the size of your room where you will be listening. Loudspeaker power handling is given as peak power which describes the maximum amount of power during short bursts while average power refers to how much power the speakers can handle constantly.
In a small listening environment, you might not need to drive your speakers to their rated value. 20 to 40 Watts of power would probably be sufficient. Loudspeakers on the other hand differ in their impedance and sensitivity. As a rule of thumb speakers with low impedance offer higher sensitivity. High-sensitivity speakers are simpler to drive to high volume than low-sensitivity loudspeakers. Not all amps can drive every speaker impedance. Find out the impedance of your loudspeaker which is given in Ohms. Then look at your amplifier manual to ensure that your amp can drive this impedance.
Finally, be sure that your amp introduces little noise and has a broad enough frequency response. High-quality amps will have a signal-to-noise ratio of at least 100 dB and a frequency response of no less than 20 Hz to 20 kHz.
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