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 difficult to pick an amplifier due to the multitude of models and styles. I will explain many 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. The following information also needs to assist you to discover which topology is great for your particular application.
Simply put, the goal of Cayin A88t Mk2 would be to convert a small-power audio signal right into a high-power audio signal. The top-power signal is big enough to drive a speaker sufficiently loud. To do that, an amp uses one or more elements which can be controlled through the low-power signal to produce a sizable-power signal. These components vary from tubes, bipolar transistors to FET transistors.
Tube amplifiers was previously common a few decades ago. A tube will be able to control the existing flow in accordance with a control voltage which is attached to the tube. Unfortunately, tube amplifiers have a fairly high level of distortion. From a technical perspective, tube amplifiers will introduce higher harmonics into the signal. However, this manifestation of tube amps still makes these popular. Many people describe tube amps as using a warm sound versus the cold sound of solid state amps.
Another drawback of tube amps, though, is definitely the low power efficiency. The vast majority of power which tube amps consume will be dissipated as heat and merely a fraction is being converted into audio power. Also, tubes are very expensive to make. Thus tube amps have mostly been replaced by solid-state amps that i will appear at next.
Solid state amps replace the tube with semiconductor elements, typically bipolar transistors or FETs. The earliest form of solid-state amps is referred to as class-A amps. In class-A amps a transistor controls the present flow based on a small-level signal. Some amps utilize a feedback mechanism to be able to minimize the harmonic distortion. Class-A amps have the lowest distortion and often also the lowest amount of noise for any amplifier architecture. If you need ultra-low distortion then you should take a close look at class-A models. The key drawback is that similar to tube amps class A amps have very low efficiency. Because of this these amps require large heat sinks to dissipate the wasted energy and therefore are usually fairly bulky.
Class-AB amps improve on the efficiency of CopperColour Cable. They utilize a number of transistors to get rid of the large-level signals into two separate areas, every one of which is often amplified more effectively. Therefore, class-AB amps are generally smaller compared to class-A amps. However, this topology adds some non-linearity or distortion in the region where the signal switches between those areas. As a result class-AB amps typically have higher distortion than class-A amps.
Class-D amps improve on the efficiency of class-AB amps even further simply by using a switching transistor which can be constantly being switched on or off. Thereby this switching stage hardly dissipates any power and phczif the ability efficiency of class-D amps usually exceeds 90%. The switching transistor will be controlled by a pulse-width modulator. The switched large-level signal must 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 by nature have among the highest audio distortion of the audio amplifier.
To solve the problem of high audio distortion, newer Line Magnetic 508ia incorporate feedback. The amplified signal is compared with the initial low-level signal and errors are corrected. A properly-known architecture which utilizes this type of feedback is known as “class-T”. Class-T amps or “t amps” achieve audio distortion which compares using the audio distortion of class-A amps while on the same.