I've been looking for awhile for a 5 channel amp to see if it makes any imorovement to my system. I came across an Adcom GFA-6000 and can get it for 200 dollars. Wondering if this is a good deal or not. I currently have a sony str-da5es receiver powering a line of JBL northridge bookshelves, center and sub. Just want to try something different and wondering if it's worth the dough. Thanks for any input.