I am trying to use my Walkman headphones with my TV. I don't have a headphone output and am trying to use the audio output. I've got the adapter which allows the phone plug to use the phone input, but am getting no volume in my headphones. My TV is set to allow for the "speaker" to work along with the regular TV volume. Any ideas? Could it be that the signal for the headphones needs to be amplified, and if so, how is this done? Thank you.