Here is my problem
HD 500 Impedance: 32ohm Noise: none.
Impedance headphones ipod touch: 32ohm Noise: low, but present.
Panansonic Impedance: 16 ohms noise unbearable.
I tried this with headphones Philips entry level has the form factor of a pro user and no sound is heard with it. In fact, it remains only to find the characteristics of the output of the MBP, and ask an audiophile performance on paper. What do you recommend? I think the audio jack may be broken. Though i am not sure of this. Any help is appreciated. Thank you for your help.