just like the title says when the volume is turned way down there is this constant buzzing noise that can be heard coming form the speakers, all the speakers are fairly new and it is running through an amp does anyone have any idea of what that is thanks in advance

have you checked your grounds and that you didn't get you + - mixed up.

you didn't send the signal wire and power wires down the same side of the car as the audio lines did you?

If you have to cross your power wire with your speaker wires make them cross like a cross + if you run them parallel = they will interfere with each other.

Engine noise can sometimes cause this if you bought a cheap $50 wal-mart amplifier. Inconsistent alternator charging can also cause this, it should be charging constantly if the amplifier is on, make sure it is. If your using a CDplayer/headunit from the head-unit, if it does not have a noise-suppressor on the 12v ignition (red wire) then it can pickup and relay engine noise that will not get filtered by the amplifier.

Make sure your head unit has a good ground, if its loose, or rusted/painted, it will buzz sometimes. Same thing with the amplifier.

What brand/model, and wattage is the amplifier, and what size 12v/ground wire are you running?