You need to lower the gain below '0' whenever you raise any of the bass frequencies/sliders. Also, you need to set the proper bass/sub bass frequencies in order to reveal the proper type/amount of bass. My LCD-X's that are hooked up to my amp/DAC stack from my PC sound incredible and have the best bass of the cans I've acquired so far.

Edit: here's a snippet of my Equalizer APO settings. https://imgur.com/a/TO1vHEo They're based on oratory1990's recommended settings with the bass frequencies adjusted to taste. My LCD-X absolutely slams. You'll notice that my Pre Amplifying setting is set to -9.5 (top-left corner). This is to compensate for the gain increase introduced by raising any of the frequencies below above 0. If I didn't do that, then it would clip and possibly sound like a blown out subwoofer.

Edit 2: Here's a link to all of oratory1990's presets that pretty much run the gamut of most of the headphones we know, love and/or hate: https://www.reddit.com/r/oratory1990/wiki/index/list_of_presets I used the LCD-X 2021 revision settings to tune my EQ. It takes some figuring out as there's a bit of a learning curve, but it's worth it.