Originally Posted by svtcobra202
Why change them to 80Hz?...
What is the advantage of changing them from full?
Each owner will need to evaluate which setting is best for their system. Here is the basic point at issue:
Onkyo has set the standard that "full" equates to any system whose bass output remains within standards (typically -3db) at 80hz. Thus a signal of, say, 60hz will be lost if the "full" range speaker actually does not go down that low. If the speaker setting is "small" however, or if "bass doubling" is set, any frequencies below 80hz will be redirected to the sub and thus will be reproduced.
How well this works depends on the smoothness of the sub in regards to it's own smoothness of output, its volume setting (many folks whose taste for bass has been set by over-exaggerated automobile boom boxes technically have their subs set too loud), and the effect of standing waves which augment some frequencies and diminish others from the listening position.
Ideally the bass roll over to the sub will be smooth and unexaggerated. If however there is too much
upper bass then male voices sound "chesty" and unnatural. Most listeners prefer a small "hole" in the bass coverage to that and in such cases leaving the speakers set at "full" proves to be the better compromise.
Note: The .1 track is another thing altogether. It is an addition to the sound track - usually an effect - not coverage of the low end of the frequency response as is the redirected bass when the mains or set to "small.".