Ok well maybe 2. I have just bought a 2105 and a couple of things puzzle me. 1. It refers to an OSD. I don't have any video outputs so not sure how this works (presumably it will work if I have "any" output to a monitor?) 2. My (old) 5.1 speakers (new ones on order) have a subwoofer which connects just like any "normal" speakers. It doesn't have a seperate amplifier/power source. The Subwoofer connection is a "jack plug" into a "pre-out" (whatever that is). Do all "new" subwoofers have one of these connections? Is this the only connection I need? Until then where do I "stick my subwoofer" (there's an invitation if I ever saw one!). Sorry for these basic questions but the back of the amp looks like the starship enterprise compared to my old one.