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 given the multitude of models and designs. I will explain many of the most common amplifier designs including “tube amps”, “linear amps”, “class-AB” and “class-D” along with “class-T amps” to help you understand some of the terms widely used by amplifier manufacturers. This guide must also assist you to work out which topology is great for your particular application.
To put it simply, the purpose of Cayin Tube Amp would be to convert a minimal-power audio signal into a high-power audio signal. The high-power signal is big enough to operate a speaker sufficiently loud. To carry out that, an amp uses several elements which are controlled by the low-power signal to produce a large-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 current flow in accordance with a control voltage which can be linked to the tube. Unfortunately, tube amplifiers possess a fairly high level of distortion. Technically speaking, tube amplifiers will introduce higher harmonics to the signal. However, this characteristic of tube amps still makes these popular. Many individuals describe tube amps as using a warm sound versus the cold sound of solid state amps.
Another drawback of tube amps, though, is the low power efficiency. The vast majority of power which tube amps consume has been dissipated as heat and merely a fraction will be transformed into audio power. Also, tubes are very costly to make. Thus tube amps have mostly been replaced by solid-state amps which I will appear at next.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 current flow according to a tiny-level signal. Some amps make use of a feedback mechanism so that you can minimize the harmonic distortion. Class-A amps have the lowest distortion and often even the lowest level of noise of the amplifier architecture. Should you need ultra-low distortion then you definitely should take a closer look at class-A models. The main drawback is the fact that much like tube amps class A amps have suprisingly 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 HIFI RCA Cable. They use a number of transistors to break the large-level signals into two separate areas, every one of which is often amplified more effectively. As such, class-AB amps are usually smaller compared to class-A amps. However, this topology adds some non-linearity or distortion in the region where 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 even more using a switching transistor which is 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 is being controlled by a pulse-width modulator. The switched large-level signal needs to be lowpass filtered to be able to eliminate the switching signal and recover the audio signal. Due to non-linearities in the pulse-width modulator and the switching transistor itself, class-D amps naturally have among the highest audio distortion of any audio amplifier.
To resolve the problem of high audio distortion, newer Line Magnetic 218ia incorporate feedback. The amplified signal is compared with the first low-level signal and errors are corrected. A well-known architecture which uses this type of feedback is called “class-T”. Class-T amps or “t amps” achieve audio distortion which compares using the audio distortion of class-A amps while in the same.