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 great number 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 frequently used by amplifier manufacturers. This guide also needs to enable you to figure out which topology is great for your particular application.
To put it simply, the goal of Cayin A100t is to convert a small-power audio signal in to a high-power audio signal. The high-power signal is large enough to drive a speaker sufficiently loud. To carry out that, an amp uses a number of elements which can be controlled from the low-power signal to create a sizable-power signal. These elements range 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 based on a control voltage which is attached 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 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 majority of power which tube amps consume has been dissipated as heat and merely 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 Thus tube amps have mostly been replaced by solid-state amps which I will appear at next.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 called class-A amps. In class-A amps a transistor controls the current flow based on a small-level signal. Some amps use a feedback mechanism to be able to minimize the harmonic distortion. Class-A amps have the lowest distortion and in most cases also the lowest quantity of noise of any amplifier architecture. Should you need ultra-low distortion then you definitely should take a good look at class-A models. The main drawback is the fact that much like 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 normally use several transistors to break in the large-level signals into two separate areas, each of which is often amplified more effectively. As such, class-AB amps are usually smaller than class-A amps. However, this topology adds some non-linearity or distortion in the region where signal switches between those areas. As a result class-AB amps routinely 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 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 take away the switching signal and recover the audio signal. Due to non-linearities from the pulse-width modulator as well as the switching transistor itself, class-D amps naturally have amongst the highest audio distortion of the audio amplifier.
To resolve 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 highly-known architecture which utilizes 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.