A preamplifier, also known as a preamp, is an electronic amplifier that converts a weak electrical signal into an output signal strong enough to be noise-tolerant and strong enough for further processing, or for sending to a power amplifier and a loudspeaker. Without this, the final signal would be noisy or distorted.

What is a pre amp used for?

In a home theatre system, the pre-amplifier performs two main functions: it handles switching between different line level sources and boosts the signal before sending it to the amplifier. A weak electrical signal becomes strong enough for additional processing, preventing noise and offering cleaner output.

What is the difference between a preamp and an amplifier?

A preamp simply boosts the signal, whereas an amp has a much wider range of functions, aside from boosting the line signal. ... For example, an amp can also mute signals, change the balance between channels, add filters and modifiers to the audio signals, and so much more.