I was browsing around Crutchfield.com last night, and noticed that most speakers have a range of up to 20 kHz (some Polk speakers have 26 kHz, but that's not a big gap). But when I looked at some of the Sony speakers, I noticed one speaker package goes up to 70 kHz (the LA300PKG) and one of their floor standing speakers goes to 50 kHz ( the SMF500H speakers). My question is this: If the average human ear can only hear sounds up to 20 kHz at the most, what is the reasoning behind Sony making these speakers? Plus, I could be wrong, but I would guess that most audio in music and movies will only go up to 20 kHz. Aside from pissing off my dog for hearing things I can't, I don't really see any benefit in these speakers.