Personally, I'd recommend you turn off Double Bass. If you feel you are lacking bass, then the only real answer is a better sub unfortunately.
f)7. What is ‘LFE + Main’ or ‘Double Bass’ and should I use it?
Thank you. I now understand much better.... About the Dyn EQ settings.... 15 DB means the lowest correction in the lower volume levels and 0DB means the most "pushing" the sound?