Hello, I need some help. I am building a steel framed home and need some advice for the speaker cables i wish to put into the wall cavity. What type of cable is best? Will the frame interfere with the quality of sound? what will be the longest distance i can run ? For the home theatre im talking about running the cable around a room that is 5 metres wide and 6 metres long. But i also wish to run speaker to other parts of the home and would guess the longest run would be around 30 metres. Please help me as i have to put the cables in soon in the next couple of weeks.