What is the optical cord used for coming from the head unit to what? Is it for power amps .... and one other question, is there a pre amp for my unit kw-avx820, or is the units self contained equalizer all I have to work with? Thank you.... Dee
What is the optical cord used for coming from the head unit to what? Is it for power amps .... and one other question, is there a pre amp for my unit kw-avx820, or is the units self contained equalizer all I have to work with? Thank you.... Dee