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Thứ Năm, 28 tháng 11, 2013

How To Get Good-Quality Audio Amplifiers

By Mike Heller


If you have paid a good amount of cash on a pair of good-quality loudspeakers, you want to be certain that you get an amplifier which will offer brilliant audio quality while meeting your budget. I will offer various tips on the subject of audio amplifier devices to aid you make the right buying decision. Audio amplifiers appear in all different shapes and sizes. They utilize different technologies and have many technical specs. By following some straightforward guidelines, you will be able to select the type that best meets your application and budget.

It is hard to select the best audio amp as a result of the large quantity of types. All of these types have different specs. They are built on different technologies and come in all kinds of shapes and sizes. This makes it tricky to make a decision which model to pick. You don't have to be an expert. Just follow some straightforward rules and you ought to be pleased with your amp.

A vital criterion is the size of the amp. You can get models that can fill half a room. In contrast, a number of of the most recent miniature amplifier types are no bigger than a deck of cards. A big number of amplifiers are the size of a standard rack. This enables your amp to be stacked on top of your other audio equipment.

Tube amps will have audio distortion of up to 10%. Solid state amplifiers will have less audio distortion depending on the amplifier technology that is utilized. The most conventional amplifiers employ a "Class-A" and "Class-AB" technology. These amps are also referred to as "analog amplifiers". This technology offers relatively small audio distortion. However, the power efficiency is merely 10 to 30%. This means that the majority of the electrical power provided to the amp is wasted as heat while a tiny fraction is utilized to amplify the audio signal.

In comparison, "Class-D" amps which are also named "digital amplifiers" have a power efficiency of normally 80 to 90%. This permits the amplifier and power supply to be made a great deal smaller than analog amplifiers. The disadvantage is that many digital amplifiers have larger audio distortion than analog amplifiers though some of the latest types make use of a feedback mechanism to reduce distortion to levels of 0.05% and below.

The amp should be capable to provide enough output power to sufficiently drive your speakers which will depend not only on how much power your speakers can handle but also on the size of your listening area. Speaker power handling is given as peak power which denotes the utmost amount of power during short bursts while average power refers to how much power the loudspeakers can handle continuously.

If your listening environment is relatively small then you might not require to drive your speaker to its rated power handling value. You would most likely be good having an amplifier that can offer 20 to 50 Watts despite the fact that your loudspeakers might be able to handle 100 Watts of power. Notice however that loudspeakers differ in their sensitivity. Usually a low-impedance loudspeaker will be simpler to drive to high volume than a high-impedance speaker. Not all amps can drive any speaker impedance. Find out the impedance of your loudspeaker which is given in Ohms. Then take a look at your amplifier manual to make certain that your amp can drive this impedance.

Additional key parameters are the signal-to-noise ratio and frequency response which should be in the order of no less than 100 dB signal-to-noise ratio and 20 Hz to 20 kHz frequency response for high-quality amplifiers.




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