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Preamplifier
Definition
A preamplifier (preamp) sits between sources and a power amplifier. It selects which source you hear and sets volume. The output is still line level. A preamp does not drive passive speakers on its own.
Some preamps add tone controls, a phono stage, or a headphone output. Many keep the path as short as possible and only switch and attenuate.
In a stereo system
Use a separate preamp when you want independent volume control feeding a dedicated power amp. An integrated amplifier already includes this stage.
Connect sources (and a DAC analog out) to the preamp's line inputs. Send preamp output to the power amp. A dedicated sub out, when present, is also line level.
Do not confuse a preamp with a power amp. Preamp outputs cannot drive speaker binding posts.
