What is the purpose of preamp jumpers?

I have a Marantz receiver vintage 1974 and I was wondering if anyone can tell me the purpose of a set of preamp jumpers supplied with the unit?

walnut06-20-2006 7:05am

nuguy Details Discussions Posts This discussion Message User 195 posts 06-20-2006 at 01:48pm Copy Comment URL Report Comment Edit Delete You could also throw an EQ there.