AVS Special Member
Join Date: Nov 2008
Location: State of Confusion - 98823
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An octave is the interval between two points where the frequency at the second point is twice the frequency of the first. 40hz is one octave below 80hz - 160hz is one octave above 80hz and two octaves above 40hz.
Most crossovers are sloped at 12db or 24db per octave and affect frequencies above and below the 80hz setting with the sub playing an octave or so above 80hz and the speakers playing an octave or so below 80hz with both tapering off the further they get from the target 80hz. At the 80hz setting and a slope of 24db the main speakers would be playing sounds at 40hz but down by 24db. The sub would play frequencies of 160hz down 24db. Not very audible on either end.
As for the AVR crossover setting affecting sound quality - I don't buy that. With many low and mid level AVR's having a good sub taking much of the load in the lower frequencies helps sound quality by freeing up the AVR to power the mid and upper range and letting the sub do the heavy lifting. Lower frequencies (20-100hz or so) require much more power to produce the same sound level as the higher frequencies to reference levels.
When all else fails - RTFM!
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