Hello guys,  When I use my headphones with remote and mic on my mobiles (htc one sv, sony xperia e1) I can hear a souspicious pop when I pull out my headphones, so I measured with a multimer and a  jack-jack cable the voltage at the output and I found more than one DC volt (for an istant) when...

hello! I've a simple question: if an integrated amplifier has  a damping  factor of 50 on a 8 ohm load, what is the headphone output impedance if it is obtained putting a 330 ohms resistance in line with speaker output? thank you