Audio amplifiers are at the very heart of every home theater system. As the quality and output power requirements of today’s loudspeakers increase, so do the demands of audio amps. It is tough to pick an amplifier due to the multitude of models and designs. I will explain some of the most common amplifier designs like “tube amps”, “linear amps”, “class-AB” and “class-D” in addition to “class-T amps” to help you understand some of the terms commonly used by amplifier manufacturers. This guide must also assist you to discover which topology is perfect for your particular application.
In other words, the purpose of Cayin A88t Mk2 is to convert a low-power audio signal into a high-power audio signal. Our prime-power signal is large enough to drive a speaker sufficiently loud. In order to do that, an amp uses one or more elements that are controlled through the low-power signal to produce a large-power signal. These factors range from tubes, bipolar transistors to FET transistors.
Tube amplifiers was once common several decades ago. A tube will be able to control the current flow in accordance with a control voltage which is connected to the tube. Unfortunately, tube amplifiers have a fairly high quantity of distortion. Technically speaking, tube amplifiers will introduce higher harmonics into the signal. However, this characteristic of tube amps still makes these popular. Many individuals describe tube amps as possessing a warm sound versus the cold sound of solid state amps.
Another problem with tube amps, though, will be the low power efficiency. Nearly all power which tube amps consume will be dissipated as heat and only a fraction is being transformed into audio power. Also, tubes are quite expensive to make. Thus tube amps have mostly been replaced by solid-state amps that i will look at next.
Solid state amps replace the tube with semiconductor elements, typically bipolar transistors or FETs. The earliest kind of solid-state amps is called class-A amps. In class-A amps a transistor controls the current flow in accordance with a little-level signal. Some amps use a feedback mechanism in order to minimize the harmonic distortion. Class-A amps possess the lowest distortion and usually also the lowest amount of noise of any amplifier architecture. If you want ultra-low distortion then you definitely should take a good look at class-A models. The main drawback is the fact similar to tube amps class A amps have suprisingly low efficiency. Consequently these amps require large heat sinks to dissipate the wasted energy and are usually fairly bulky.
Class-AB amps improve on the efficiency of Speaker Cable. They utilize a number of transistors to interrupt the large-level signals into two separate areas, every one of which may be amplified better. As a result, class-AB amps are generally smaller than class-A amps. However, this topology adds some non-linearity or distortion in the region where the signal switches between those areas. As such class-AB amps typically have higher distortion than class-A amps.
Class-D amps improve on the efficiency of class-AB amps further simply by using a switching transistor which is constantly being switched on or off. Thereby this switching stage hardly dissipates any power and phczif the power efficiency of class-D amps usually exceeds 90%. The switching transistor has been controlled with a pulse-width modulator. The switched large-level signal needs to be lowpass filtered so that you can remove the switching signal and recover the audio signal. As a result of non-linearities from the pulse-width modulator and the switching transistor itself, class-D amps naturally have between the highest audio distortion of any audio amplifier.
To solve the situation of high audio distortion, newer Line Magnetic 218ia incorporate feedback. The amplified signal is in contrast to the initial low-level signal and errors are corrected. A highly-known architecture which uses this sort of feedback is known as “class-T”. Class-T amps or “t amps” achieve audio distortion which compares with the audio distortion of class-A amps while in the same.