I have a problem with the Line-Out from the new 15" MBP. If I connect my ear/headphones to the audio output I can hear a hizz/hum. The volume of the tone does not change if I change the audio volume and does not go away if I play music. I have tried it with B&O A8 earphones and B&W P5 headphones. I also unplugged any cable. The hizz/hum get a bit more silent if I remove the USB and minidisplay plugs, but it still there. Only if I remove the MagSafe plug the hizz is gone. I already tried the 3 and 2 pin power cable. I wonder if it is due to the low impedance due to the earphones? I will try to connect the MBP do my stereo. Does anyone else expirence this problem?