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 large number of models and fashions. I will explain probably 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 should also assist you to figure out which topology is perfect for your particular application.
Simply put, the goal of Cayin 300B is always to convert a low-power audio signal right into a high-power audio signal. Our prime-power signal is big enough to get a speaker sufficiently loud. To do that, an amp uses one or more elements which are controlled from the low-power signal to generate a big-power signal. These components range between tubes, bipolar transistors to FET transistors.
Tube amplifiers was previously common a few decades ago. A tube has the capacity to control the existing flow based on a control voltage which is attached to the tube. Unfortunately, tube amplifiers use a fairly high level of distortion. Technically speaking, tube amplifiers will introduce higher harmonics into the signal. However, this characteristic of tube amps still makes these popular. Many individuals describe tube amps as having a warm sound versus the cold sound of solid state amps.
Another problem with tube amps, though, is the low power efficiency. Nearly all power which tube amps consume is being dissipated as heat and just a fraction has been converted 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 Thus tube amps have mostly been replaced by solid-state amps that i will appear at next.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 form of solid-state amps is known as class-A amps. In class-A amps a transistor controls the present flow according to a little-level signal. Some amps use a feedback mechanism in order to minimize the harmonic distortion. Class-A amps possess the lowest distortion and in most cases also the lowest level of noise of any amplifier architecture. If you want ultra-low distortion then you certainly should take a good look at class-A models. The key drawback is the fact comparable to 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 utilize a number of transistors to interrupt up the large-level signals into two separate areas, each of which is often amplified more effectively. Therefore, class-AB amps are usually smaller compared to class-A amps. However, this topology adds some non-linearity or distortion in the area in which the 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 further 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 by a pulse-width modulator. The switched large-level signal must 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 also 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 508ia incorporate feedback. The amplified signal is compared with the original 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 with the audio distortion of class-A amps while on the same.