Hi, i have this sony headphone which has 3.5 mm pin. But i want to use it to listen to my tv which is connected to denon amplifier. This amplifier has 6.35 mm socket. So please guide me how to connect my headphone to this amplifier and also i am in need of an extension cable because my head phone has a wire only around 1 metre in length. So can you also suggest how can i extend my headphone wire. Thanks a lot.