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 hard to pick an amplifier given the multitude of models and fashions. I will explain probably the most common amplifier designs such as “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 enable you to figure out 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. Our prime-power signal is large enough to get a speaker sufficiently loud. To do that, an amp uses one or more elements that are controlled by the low-power signal to generate a large-power signal. These factors vary from tubes, bipolar transistors to FET transistors.
Tube amplifiers was previously common several decades ago. A tube will be able to control the existing flow based on a control voltage that is attached to the tube. Unfortunately, tube amplifiers use a fairly high amount 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. Lots of people describe tube amps as having a warm sound versus the cold sound of solid state amps.
Another drawback of tube amps, though, is definitely the low power efficiency. The majority of power which tube amps consume will be dissipated as heat and only a fraction will be transformed into audio power. Also, tubes are very expensive to make. Thus tube amps have mostly been replaced by solid-state amps which I can look at next.
Solid state amps replace the tube with semiconductor elements, typically bipolar transistors or FETs. The earliest form of solid-state amps is known as class-A amps. In class-A amps a transistor controls the current flow in accordance with a small-level signal. Some amps make use of a feedback mechanism so that you can minimize the harmonic distortion. Class-A amps hold the lowest distortion and often even the lowest amount of noise for any amplifier architecture. If you need ultra-low distortion then you should take a closer look at class-A models. The key drawback is that much like tube amps class A amps have very 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 CopperColour Cable. They utilize several transistors to interrupt up the large-level signals into two separate areas, every one of which may be amplified better. Therefore, 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 normally 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 that 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 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. Due to non-linearities in the pulse-width modulator and also the switching transistor itself, class-D amps by nature have among the highest audio distortion of any audio amplifier.
To resolve the issue of high audio distortion, newer Line Magnetic 219ia incorporate feedback. The amplified signal is in contrast to the initial low-level signal and errors are corrected. A properly-known architecture which uses this sort of feedback is called “class-T”. Class-T amps or “t amps” achieve audio distortion which compares with all the audio distortion of class-A amps while in the same.