Yeah, as phil mentioned it was a ground loop or simply AC interference from a bad connection / lack of balanced audio.
Being probably 60 or 50 hz (depending on country), it's a very low frequency and some headphone or speakers won't reproduce it so well. My very bassy Bose headphones in the other hand reproduced this unwanted interference with perfect clarity. :) http://en.wikipedia.org/wiki/Balanced_audio "The term "balanced" comes from the method of connecting each wire to identical impedances at source and load. This means that much of the electromagnetic interference will induce an equal noise voltage in each wire. Since the amplifier at the far end measures the difference in voltage between the two signal lines, noise that is identical on both wires is rejected. The noise received in the second, inverted line is applied against the first, upright signal, and cancels it out when the two signals are subtracted. On Jan 18, 9:16 am, "Robert Casto" <[email protected]> wrote: > Thanks everyone for proving that I'm not hearing things. > > On Sat, Jan 17, 2009 at 5:30 PM, Christian Catchpole < > > > > [email protected]> wrote: > > > I was listening on my Bose headphones. Sounded feeekin awesome... :) > > > On Jan 17, 8:54 am, Phil <[email protected]> wrote: > > > Yes, I heard it - was listening in the car through an FM tuner. > > > Sounded like an earth loop to me (I used to run a student radio > > > station) - dare I refer you to wikipedia to read more - > >http://en.wikipedia.org/wiki/Ground_loop_(electricity)<http://en.wikipedia.org/wiki/Ground_loop_%28electricity%29>- > > but there are > > > plenty more sites that discuss the problem. > > > > We had one cartridge player that always caused a hum when it was > > > plugged in, the only way to stop it was to disconnect the earth wire > > > from the mains. Not popular when the mains feeds straight in to the > > > equipment which is effectively a large metal box. > > > > On Jan 13, 4:56 pm, "Robert Casto" <[email protected]> wrote: > > > > > It was only there when one of the guys was talking. > > > > > -- > > > > Robert Castowww.robertcasto.com > > > > [email protected] > > -- > Robert Castowww.robertcasto.com > [email protected] --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "The Java Posse" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/javaposse?hl=en -~----------~----~----~----~------~----~------~--~---
