I am always amazed on the quality of responses on this section of the HTF. My question is this--how does one go about to learn the type of information that is given on this forum. For example, if you wanted to learn about electrical wiring, you could buy and study books, take classes, help electricians, etc. and you would learn the process. How do you guys know know what speakers would usually be a good match to certain receivers? And what speakers to add to existing systems to upgrade them? Here's my next upgrade project, and why I ask the question: I have a Denon 1803, which I think is great, 4-Advent A1122 from when I went to DPL several years ago. I always thought they sounded great, and with the Denon (which replaced a Technics DPL receiver), I really hear what I've been missing all these years. I also have an Advent Audio Focus II center, which sounds great with movies, but not always so hot with music (but it depends on the quality of the source material). Anyway, I would like to add sometime this year two more speakers for the back surrounds, and a subwoofer. Since Advent is no longer with us, you can see my dilemma. Plus I don't have a huge budget to work with (there are other things on the list, boring things like a new clothes dryer). Do I just keep an eye out for Advent subwoofers and speakers on ebay? Would one Advent center speaker work OK as the back center? (Denon 1803 is a 6.1 receiver, but recommends two speakers on the back center channel) Two other model Advent as the back center? One? Anyone have an Advent subwoofer? Would a Dayton sub be the best buy? Or chuck the whole lot and start building a new speaker system? Then what brand/model? Bose?(I at least know this isn't correct.) I'm in no hurry and really would like to learn how to answer these questions, not just suggestions. Since I'll probably have a few more chances in the next 50 years buying speakers. Thanks for everyone's help.