My brother (not on a'gon) opined:
"Who knew the level of dorkdom in the world? U do need to turn the power up with lower frequency settings. Reason being, wider, slower waves need more watts to reach the same amplitude of percieved loudness. 80 hz is a little muddy to my ears for a sub. I'd try around 65 hz. Keep in mind that the frequencies are actually notes, so you may want to tweak it based on what key the music you are listening to is in. To figure out notes, keep in mind 110 is an "a" and use pythagorean fractions to tune down to the key you are in. 55 is also "a" ...."