I am a new user of Z-5500, and have observed a hum from the subwoofer. I experienced a low buzz / hum in the sub at what time the system is taking place it is plainly audible at what time not playing music. It is still there at what time not connected on the way to the console, still in the MUTE mode. I have looked a bit and I'm pretty sure that this sound is prepared through the speaker itself (it is most excellent heard from the face side of the subwoofer). He does not obtain louder or softer alteration within the volume settings and no whistles from satellites. I have tried to shut down, disconnect the console cable and reconnect firmly, however do not seem to help.
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