sub cut off frequency

[pere]

The question is not more or less bass.
The question is get a balanced sound. That depends of multiple factors like acoustics, speakers, position etc.
If your speakers are set at 80Hz you can't go less than that because you'll miss frequencies.
I'd start at maximum (200Hz) and let that your receiver handle everything.
If you obtain a boomy sound you could try diminish step by step the cut off of your sub till you get a pleasant sound.
Sometimes is hard to obtain the ideal sound.