Integrated amplifier
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An integrated amplifier (pre/main amp) is an electronic device containing an audio preamplifier and power amplifier in one unit, as opposed to separating the two. Most modern audio amplifiers are integrated and have several inputs for devices such as CD players, DVD players, and auxiliary sources. Integrated amplifiers commonly had dedicated inputs for turntables, AM/FM tuner, and tape recorders (cassette or reel-to-reel) back when those devices were more common. Except for the turntable, all of the inputs are line level, thus they are interchangeable. The turntable also uses RIAA equalization.
In signal processing, an integrated amplifier is similar to an inverting amplifier, except that the feedback impedance includes a capacitor. However, due to non-ideal properties of the operational amplifier, a resistor still needs to be added into the feedback path along with this capacitor. The start of "true integration" occurs at ten times the corner frequency.
Using a small proof, the output voltage for an integrator is solved the the following equation: Vo=-(1/(R1*C) ∫ (Vi)*dt
A practical integrator: 
[edit] See also
- Audiophile
- High-end audio
- High fidelity
- Low fidelity
- Valve audio amplifiers
- Operational amplifier applications
[edit] Sources
- User Rutujadeshpande
- Queen's University ENPH333 Notes- Prof. J.L. Mason
