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 given the multitude of models and designs. I will explain many of the most common amplifier designs such as “tube amps”, “linear amps”, “class-AB” and “class-D” along with “class-T amps” to help you understand some of the terms commonly used by amplifier manufacturers. This informative guide also needs to assist you to work out which topology is great for your particular application.
In other words, the goal of Cayin 300B would be to convert a small-power audio signal into a high-power audio signal. The high-power signal is big enough to get a speaker sufficiently loud. To carry out that, an amp uses one or more elements which can be controlled from the low-power signal to produce a sizable-power signal. These components vary from tubes, bipolar transistors to FET transistors.
Tube amplifiers used to be common a few decades ago. A tube has the capacity to control the present flow in accordance with a control voltage that is attached to the tube. Unfortunately, tube amplifiers use a fairly high quantity of distortion. From a technical perspective, tube amplifiers will introduce higher harmonics in to the signal. However, this characteristic of tube amps still makes these popular. Many people describe tube amps as having a warm sound versus the cold sound of solid state amps.
Another drawback of tube amps, though, is the low power efficiency. Nearly all power which tube amps consume has been dissipated as heat and just a fraction will be changed into audio power. Also, tubes are quite costly 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 Thus tube amps have mostly been replaced by solid-state amps that i will appear at next.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 type 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 utilize a feedback mechanism to be able to minimize the harmonic distortion. Class-A amps hold the lowest distortion and usually also the lowest level of noise of the 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 really low efficiency. Because of this these amps require large heat sinks to dissipate the wasted energy and are usually fairly bulky.
Class-AB amps improve on the efficiency of Audiophile Cables. They normally use several transistors to interrupt the large-level signals into two separate areas, all of which is often amplified more efficiently. As such, class-AB amps are generally small compared to class-A amps. However, this topology adds some non-linearity or distortion in the area where signal switches between those areas. Therefore class-AB amps routinely have higher distortion than class-A amps.
Class-D amps improve on the efficiency of class-AB amps further using a switching transistor which is constantly being switched on or off. Thereby this switching stage hardly dissipates any power and phczif the energy efficiency of class-D amps usually exceeds 90%. The switching transistor will be 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. 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 the audio amplifier.
To fix the situation of high audio distortion, newer Line Magnetic 218ia incorporate feedback. The amplified signal is compared with the initial low-level signal and errors are corrected. A properly-known architecture which uses this kind of feedback is referred to 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.