I have the wilress BT version sir. Thank you also for the advice sir :) I'm glad that there are no side effects to it and if  buying an amp isn't worth at all for mk2. I have to think again btw thanks.

Thank you for the advice sir :) I'm just planning to use amp when i'm in the office and when i'm outside i will use the wireless connection ..

Hi Guys I'm new in Head-fi and i just bought sony-mdr-1r-series-mk2.. Can i buy a portable amplifier and use it using the connecting cord??   is there any side effect to the headphone if i use another amplifier??   and if i use the connecting cord to the headphone does it need to be lowbat...