| Re: sub in the closet?
As I think you've figured out, I was suggesting the lowest usable crossover point to avoid/minimize localization. You could experiement with the 50hz xover, but 80hz is probably ok...that's one octave above your speakers rated f3 point. Crossovers aren't brickwalls so if you cross too close to their lower useful limit, they'll receive a signal they can't really produce, creating a hole in your overall response.
Side firing the driver into the closet probably "corner loaded" the signals above your xover point, that would normally fall into the background. The cabin gain of the small dimensions of the closet boosted the >80hz info enough to be audible. Remember...with a 4th order filter at 80hz, a 120hz tone will only be down roughly 12dB in your sub.
Front firing the driver with the ports top firing would probably work, too. The passband of the ports (20hz? tuning) shouldn't go high enough to excite localizable frequencies.
-Brent
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