Integrated Amplifier
Definition
An integrated amplifier combines a preamplifier and a power amplifier in one box. You select sources, set volume, and connect passive speakers to the same unit.
Many models also include a DAC, a phono stage, streaming, or a headphone amp. Those extras do not change the core job: line-level control plus speaker-level power.
In a stereo system
An integrated amp is the default power stage for most two-channel systems. Separates (preamp plus power amp) add flexibility and upgrade paths. They also add cables, rack space, and cost.
If you use powered speakers, you usually do not need the power-amp half. You may still want a preamp or a source with volume control.
Check impedance ratings and wattage the same way you would for a separate power amp. See Stereo System Design for when integrated vs separates makes sense.
