I had just bought the Onkyo 609 AV receiver online. I heard the 509 and liked it though to be true it did sound a bit too agressive for my liking... I went to buy some banana plugs and the store had the 671 in stock. I auditioned my fave CD with it and a pair of Jamo 608 floorstands and REALLY liked the warm, relaxed nature of it. I just had to have it... To cut a long story short I ended up buying the Yammy instead !