11/17   I have an older but high-end TEAC receiver and four Bose speakers. Any
        time the system is on I hear buzzing through the speakers. What does
        it take to get rid of the buzzing. (Already checked grounding).
        \_ probably picking up interference.  are they near some other power
           source like your computer or monitor?
           \_ Near a TV but the sound occurs whether or not the TV is plugged
              in.
              \_ your speaker is not magnetically shielded?
        \_ was it always like this?  Maybe it just broke.  Loose connections?