Voices coming out of the subwoofer
True subwoofers of actual operating design are not meant to carry signal frequency that will reach into the range required to play back human voice, in the 400-500Hz range it becomes audibly recognizable as human mediated. Down to even around 80Hz there are some fundamentals of the human voice frequency range that your system would play back, but you shouldn't be able to hear it separately when all is working properly.
Since you are hearing this noise and are able to recognize what it is, I'm going to assume two things;
1. It's frequency is high enough to be intelligible as human voice
2. It is NOT from any source that you are trying to play through it, so it
is likely coming from RFI; or radio frequency interference. Likely source of that is from police scanners and CB radios in your area.
My second assumption is based solely on the fact of how in systems such as yours, bass management circuitry works. Noise from an outside source will bypass that circuitry. Intended sources such as what you have plugged into the system will run through that circuitry and you'd hear it through the satellite speakers instead of how you're hearing it right now.
There are several ways solving this problem, starting with the free and simple ones first is always best.
Power source. Plug it into an outlet on a different circuit. Finding an alternate circuit is easy; go to your electrical switch panel and turn off one switch at a time starting with the switch that controls the outlet power to your current connection. If it turns off but then you still have another device in the same room that has power, plug it into the same outlet for THAT device. The general idea is to get your electronics isolated from circuits that have such devices powered on it like fluorescent lighting, refrigerators, freezers, microwaves, fans, cathode ray-tube (old) TV's or anything with an electric motor in it especially.
If moving it does not provide satisfaction, I recommend an AC line power conditioner with noise suppression like from Tripplite, plus a series of what is called ferrite clamps. Both of these items can be found at Radioshack. Place the ferrite clamps on the power cord of your system. Keep in mind the diameter of the cord size when choosing your clamp design; if the clamp is not tight it will not work. You can also place these clamps on any device in your home circuit that would PRODUCE the noise and introduce it back into the circuit for your system to pick up. So if for example, your ferrite clamp would fit better on the power cord of the only device in the circuit that may pick up the RFI and pass it to your JVC system, then try it out. It usually takes more than one clamp in series on a single power cord for higher powered items though.
on Dec 20, 2011