Two-channel amplifiers: basic parameters, types and classification

In various stereo systems, a sound amplifier is built into the device. However, when connecting speakers with higher power and setting a louder sound, you must use two-channel power amplifiers. Amplifiers can be connected both to speakers and to common channels using a bridge connection. They support a low resistance load. The main advantage is the ability to save adjustment combinations.

When an amplifier is installed in a stereo system, the sound quality is not always good. You can fix this problem by installing a sound processor.

Dual Channel Amplifier Parameters

Power is an important indicator for an amplifier. It can be of two types: nominal (RMS) and maximum (PMPO). When buying in the documents you can read about the rated power. On the product itself, they write about multi-channel, which shows the maximum power of the common channels. When buying an amplifier, you should check the availability of a certificate that indicates the factory measurement of the power of the device.

Two-channel amplifiers contain an integrated crossover, which makes it possible to cut the lower ones, leaving the upper frequencies. Using this parameter, you can adjust the cutoff frequency gradually and reproduce sound amplification on one channel. The bass tuning key is a useful feature, especially when connecting a subwoofer: it is possible to smoothly increase the bass level.

Bridged connection makes it possible to increase the total power. Using this method, the connection of powerful subwoofers is applied.

Two-channel amplifiers are equipped with a connector for connecting a linear wire. Line wires receive signals from a standard stereo system. From overheating of the system, a fan is installed in the amplifiers.

When choosing sound amplifiers, pay attention to the trading manufacturer, giving preference to those who have proven themselves on the positive side.

Main types

Two-channel amplifiers are: tube, transistor, hybrid, digital and tripates. The first type uses an electronic vacuum lamp, and the sound is cascaded. Transistor amplifiers are more powerful and generate sound louder. Digital sound amplifiers work on integrated circuits, have high efficiency and better sound quality.

Hybrid amplifiers are made up of electronic tubes, semiconductors, and integrated circuits, combining the benefits of previous types.

Classification of two-channel amplifiers

Depending on the principle of operation, there are several classes of two-channel amplifiers, which are discussed below.

Type of amplifier	Class	Short review	Benefits
Lamp	A	They have low power and overpriced. They distort the sound, resulting in an efficiency of 20%.	Low power.
Transistor	IN	High coefficient of performance, dissipate thermal energy, but are not popular.	Two-channel power amplifiers have a reduced noise level. Compactness, overall performance.
Transistor	WITH	High performance ratio: 75%.	The best option for the equipment of the sound system of the car.
Hybrid	AB	Two-channel sound amplifiers have a high coefficient of performance. Mode - intermediate between modes A and B.	All the benefits of Class A and B.
Digital	D	The ability of digital signal processing. Use PWM modulation and fixed frequency. The presence of a smooth phase regulator and bass boost circuit.	Small size, good sound in its purity, high efficiency.
Digital	G, N	The amplifier consists of a switching power supply and provides digital signal processing. High cost.	Good sound quality.
Tripates	T	The output transistors are switched at a pseudo-random frequency, depending on the level of the input signal.	Modulation schemes receive ultra-small nonlinear distortion. High efficiency.