Every hi-fi or home cinema system has a low background noise due to the circuitry. This noise increases if an input is selected to which no music source is connected or if the volume is turned up. If a music source (e.g. CD player, MP3 player or PC outputs) is properly connected to the system and such an input is selected for operation, the noise level of all devil systems is at or below the usual global level for high-quality transistor amplifiers. A slight noise in the loudspeakers therefore does not mean faulty operation.
If you do suspect a fault, take a look at the instructions: How do I check whether cables, speakers or amplifiers are faulty? and our blog article When speakers are noisy: In search of pure sound and the following video:
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