Integrated Amp is a single box that integrates the function of a control preamp and a power amplifier. Integrated has volume, source selection and in some cases mono/stereo, phase, and balance controls. A line preamp has all these same features but you have to run interconnects from its output to a power amp. A preamp can't drive speakers. Integrated amps are nice for saving space and dollars but you probably get more flexibility and bang for your buck buying the preamp and amp as separates. There is some compromise in current handling, S/N ratio, and distortion putting everything in one box. By the way a receiver in an integrated amp + a tuner.
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