Connected the Magnus larsson speakers they are 10 x better than the yamahas!!!! The sound is crisp and not distorted, however the videos I have on my iPhone are not playing at the same levels as cable tv, CDs and DVDs etc?? Is this because that the receiver does not have enough power?? Should I get something with more power like the pioneer I've mentioned above?? I realize that iPhone / iPod sound quality isn't great but my dad runs his through his kenwood 5.1 system that is a in the box package and manages to get maximum DB?? Any ideas??