Shutting off amp noise


When I turn off my poweramp (bel canto evo2), there is a small noise through the speaker, even though the preamp is on. Is this indicative of a problem? My other amp (rotel) doesn't do that.
samuellaudio

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Is it through both channels? And is it a slight buzzing (similar to a fruit fly) that fades in about 5 seconds or less?