Why do speakers make that hissing sound?
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Due to the way they function, every stage in an electronic amplifier leaks small transient electrical signals which excite the speaker’s coil and move its cone, producing an audible hiss. If the hiss increases when you turn up the volume, then most of the leakage is in the pre-amplifier (the stage that amplifies input signal to a level that the final stage can work with. If the hiss remains steady when you increase the volume, then most of the leakage is in the final stage.
While no amplifier is leakage-free, leakage generally decreases as amplifier quality (and price) increases. High quality amplifiers are designed to suppress hiss to sub-audible levels at normal listening volumes.
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