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huge parallel capacitor to the power cord: why bad?

Why is nobody connecting a huge parallel capacitor to the power cord of an amp?

An amplifier with linear power supply draws current from the wall in the form of two short (mush shorter than half period of 60 or 50 Hz) pulses in one cycle of 60Hz (or 50Hz) AC power.

A mecanical analoge: a capacitor in parallel to an amplifier's AC power input is like a fly wheel connected to a piston engine.

To me this parallel AC capacitor connection looks like a cost effective sound quality improvement, but I saw nobody doing this. Why?


Edits: 08/09/14 08/09/14 08/09/14 08/09/14 08/09/14
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Topic - huge parallel capacitor to the power cord: why bad? - dave789 16:58:21 08/09/14 (22)
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