Crossover Settings Suggestions

Your setup is fine. With decent speakers there willl be a range of crossovers thstnwork essentily identically. With normal source material - music and movies- my brief unscientific check confirmed that crossover from 40 to 80 hz were essentially indistinguishablle at my listening levels. When there are several right answers sny one of them is right.

Perhaps your subwoofer was disabled while testing the crossover points?

why in the world would you say that? Seems the silliest possible explanation. More likely the mains and sub are flat enough in the range between 40 and 80 Hz as to be indistinguishable with real source material. No idea how audible the diffs might be with test tones, but if it was HUGELY different, something is terribly wrong with something ( unless the mains just don't extend to below 100 Hz with any authority).

Plus, however tin my ears may be, I'd like to imagine I'd notice the missing octave below 80 Hz if the sub was off . . .
Edited by JHAz - 2/3/13 at 5:13pm

You did mention your test was brief and unscientific ...

Why 40 to 80hz

duh, because that's the range of sub crossover frequencies I tested. See, if the sub plus mains adds up the same at a 40 Hz corssover as at 50, 60 , 70 or 80 (and they are all perfectly flat) there's no possibility that they sound different. If the splice between main and subs difffers in ways that don't make themselves obvious with normal program material, then deviations from flat, while not ideal, are at least indistinguishable as a practical matter. That's what I suppose I heard when flipping among my different crossover frequencies (always recalling that this is me sitting in a room using limited range of material not carefully controlling the frequency content of what I listen to and certainly not operating blind' (ie without knowing which crossover was in place at any given time). SO not rigorous, just enough for me to have a decent sense that I could be happy with any of those crossover frequencies.

If you are using the Oppo's multichannel analog outs, then your AVR crossovers do not come into play. Bass management for analog output must be done in the player, not the receiver, as it happens prior to the digital-analog conversion. Also, you should not set the sub filter at 80Hz. With that setting, LFE above the crossover will simply be discarded. You want to send the sub everything in the .1 channel plus bass from the main channels below the crossover.

If you really want to check crossovers, I suggest using bass sweeps on a calibration disc. They'll show you where each speaker can no longer handle low frequencies as well as the sub.