It's either a higher being calling you to fulfil your destiny or - more likely - the cable between the receiver and the sub acting as an aerial.
Do the voices go away when you disconnect the cable from the receiver? If so, the problem might be in the receiver.
If not, do they stop when you disconnect the cable from the sub and the receiver? If so, it's probably poor shielding in the cable.
If they continue with the cable disconnected from the sub, then either the sub is faulty, or its picking up the voices via the mains cable, though this last one is very unlikely.
You could try changing the cable, or putting a couple of ferrite clamps on your existing one.
If you still hear the voices when everything is switched of, then one of the following is true:
a) You are the chosen one
b) You have very thin walls
or c) You need help of a kind I am not qualified to offer.