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Dual-channel amplifiers: basic parameters, types and classification
In various stereo systems, a sound amplifier is built into the device. However, when connecting speakers with more power and setting a louder sound, two-channel power amplifiers must be used . You can connect amplifiers to both speakers and common channels using a bridge connection. They support a low-resistance load. The main advantage is the ability to save the adjustment combinations.
When the amplifier is placed in the stereo system, the sound quality is not always good. You can fix this by installing a sound processor.
Parameters of two-channel amplifiers
Power is an important indicator for the amplifier. It can be of two types: nominal (RMS) and maximum (PMPO). When buying in documents, you can read about the nominal power. On the product itself they write about multi-channel, which shows the maximum power of common channels. When buying an amplifier, you should check the availability of a certificate, which indicates the factory capacity measurement of the device.
Two-channel amplifiers contain a built-in crossover, which makes it possible to cut the bottom, leaving the upper frequencies. Using this parameter, you can adjust the cutoff frequency gradually and reproduce the sound gain by one channel. The bass setting key is a useful function, especially when connecting a subwoofer: it is possible to smoothly increase the bass level.
Bridge connection gives the opportunity to increase the total capacity. Using this method, the connection of powerful subwoofers is used.
Two-channel amplifiers are equipped with a connector for connecting a line wire. Line wires receive signals from a regular stereo system. A fan is installed from the system overheating in the amplifiers.
Choosing amplifiers of sound, pay attention to the trading manufacturer, giving preference to those who have proved from the positive side.
Basic views
Two-channel amplifiers are: lamp, transistor, hybrid, digital and tripat. The first type uses an electronic vacuum lamp, and the sound is cascaded. Transistor amplifiers are more powerful and generate a louder sound. Digital audio amplifiers work on integrated circuits, have high efficiency and better sound quality.
Hybrid amplifiers consist of electronic tubes, semiconductors and integrated circuits, combining the advantages of previous types.
Classification of two-channel amplifiers
Depending on the principle of operation, several classes of two-channel amplifiers are distinguished, which are discussed below.
Amplifier type | Class | Short review | Benefits |
Lamp | A | They have low power and high cost. They distort sound, resulting in an efficiency factor of 20%. | Low power. |
Transistor | AT | High performance factor, dissipate heat energy, but not popular. | Dual-channel power amplifiers have a reduced noise level. Compactness, work efficiency. |
Transistor | FROM | High performance factor: 75%. | The most optimal variant for the equipment of a sound system of the car. |
Hybrid | AB | Two-channel sound amplifiers have a high performance factor. Mode - intermediate between modes A and B. | All the advantages of classes A and B. |
Digital | D | The ability of digital signal processing. Use PWM modulation and fixed frequency. Presence of a smooth regulator of a phase and the scheme of lifting of a bass. | Small size, good sound in its purity, high efficiency. |
Digital | G, H | The amplifier consists of a pulsed power supply and provides digital signal processing. High cost. | Good sound quality. |
Tryps | T | Output transistors commute at a pseudo-random frequency, depending on the level of the input signal. | Modulation schemes produce extremely small nonlinear distortions. High efficiency. |
Car Audio Amplifier
A two-channel amplifier for a subwoofer is designed to amplify sound and improve the volume to an optimum level. To correctly buy a suitable device in the car, match it to the characteristics of the subwoofer.
Two-channel amplifiers will create a harmonious sound for any stereo system.
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