IMO, 120 or 130 is still a bit too low. You have to keep in mind, the xover point is where the signal starts to roll off. A lot has to do with the slope of the roll off, which is something you wouldn't know unless you call the manufacture and hope they tell you (the probably won't). If the speaker produces down to 120hz -3db, I would set the receiver xover at least at 150hz or even 180 to 200hz if the sub can handle it. The idea is to keep the response output as flat as possible. So, eliminate the dips or roll off in this case. Set the xover far enough in front of the roll off to deal with it.
IMO, set the xover before the speaker bottoms out or breaks up (peaks and dips)...as a rule of thumb. Then I would integrate the sub and sats from there. Believe it or not, that extra 30 to 80hz buffer room will not only help, but make a difference.
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