What is an external amplifier?
Phrases External amplifier has two connected uses. The first is to describe the audio system using passive speakers that do not have built -in amplification. This means that the audio signal must be amplified by a separate device before transferring to the speaker. The second use is to refer to a device that carries and processes an audio signal from multiple audiovisual products, such as DVD players or TVs, and gives it to speakers. Although such devices usually include an external amplifier, the device itself is usually referred to as a receiver. The active speaker, sometimes known as powered or self-cast, has a built-in amplifier. This means that it can be connected directly to the sound source such as the record player. The main advantages are that the speaker has a stronger output and can cope with a wider range of volume. The biggest disadvantages are that such speakers need their own reserved power cord and that they tend to be much harder. Are also too tracksé for home and unprofessional settings.
Most domestic audio systems and small public addresses use passive speakers instead. They require a separate amplifier that amplifies the sound before handing over the speaker. For Hi-Fi systems, this is usually built into a unit that contains different components such as CD player, tape deck and radio. With home cinema, an external amplifier is usually part of a separate device, a receiver that allows the user to switch between sound signals for home entertainment, such as TVs, cable boxes or game consoles.
strictly, there is some confusion between the concept of passive and active speakers and the concept of driven or single speakers. This confusion can mean the use of various participating phrases is not always accurate. The confusion is that there are two separate operations that can be performedeither in the speaker or in a separate device.
The first of these operations is the amplification of the sound, which is covered with terms driven and uncident. The second operation is to divide the audio signal into separate frequencies, which are produced by separate parts of the speaker, often known as tweeter and woofer. The active speaker system distributes the signal before reaching the speakers, while the passive speaker system leaves the distribution into the speaker itself. It is possible to have a speaker that is powered but passive: the most common example is small speaker systems used to listen to portable music players without headphone.