OK - I'm new at this - the last time I purchased equipment it was all analog. Here is my story\/question:\n\nI purchased a Yamaha RX-1050, along with a Definitive Sub. This is two channel audio (music) only. \n\nI set up my system with old Polk bookshelf speakers hanging around, and ran YPAO. The results looked weird. The speakers (all 3) were actually about 10 feet away, but YPAO reported the two front speakers as abt 10 feet, the Sub 20 feet away. Levels were also set - the 2 front at +10db, the back at about -10 - a 20db difference. Seemed pretty odd to me. Of course front speakers reported as large, which is apparently some type of defect in the algorithm - these speakers were tiny. \n\nReplaced Polks with a pair of Klipsch (trying out to decide if I want to keep). Results got even weirder. YPAO reported the 2 front at about 10feet (correct), the sub now at 1 foot away (ridiculous) Levels as above.\n\nIt gets weirder. I better understand the 1050, so I go into manual mode and look at the parametric settings that YPAO generated. \n\nBoth front speakers have a bump at about 80 hz, where I would expect the sub to be working. The also have an interesting curve at the mid-high end which for all I know is correct. The sub has a huge bump at 250hz, which I doubt it could even reproduce. \n\nOverall the sound to me is a little "hot" through the mid range, but not terrible. Maybe I just need to get used to it, or maybe I don't get what's being done. \n\nIs there something I'm missing? Is YPAO (in my 2.1 speaker setup) useful, or should it be ignored?\n\n\nthnx,\n\n\n.