a little explanation first. i am sending a/v to my tv. the tv has a line level audio connection. i am using a line level powered preamp to drive headphones. just works in terms of volume. question--- can i use a second preamp in series to drive the same phones? or am i better off to replace the preamp with a small 3 stage amp to drive the phones instead of speakers? this will allow both tv speakers and headphones by selection. the phones give better stereo than the tv speakers.