Power Amplifiers

Power amplifiers are audio components designed solely to increase the power of an audio signal so it can drive loudspeakers. Unlike integrated amplifiers, power amplifiers do not include source selection or volume control and instead rely on an external preamplifier or source component to manage the signal. In hi-fi systems, power amplifiers are used where greater output capability, system flexibility or separate component design is required.

Power Amplifiers in Hi-Fi Systems

A power amplifier receives a line-level signal from a preamplifier, integrated preamp section or source component with volume control, then delivers sufficient current and voltage to drive speakers accurately. Because the power stage is isolated from signal control, power amplifiers are commonly used in higher-end systems or setups that favour separate components. In contrast to integrated amplifiers, power amplifiers focus exclusively on speaker drive and require external signal control.

Power amplifiers are available in different circuit designs and operating classes, each with specific efficiency and output characteristics. Selection depends on speaker sensitivity, room size and how the amplifier integrates with the rest of the system rather than on tonal descriptors or subjective performance claims.
In many systems, power amplifiers are fed by a preamplifier or source component such as a DAC with variable output.

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