For genuinely deep bass, the 60Hz shelf is the whole story — it's the only band in this tool that reaches down into sub-bass territory.
A boost of 6–8dB gets noticeably deep, but check your playback system's limits — small speakers simply can't reproduce very low frequencies and may distort instead. Keeping the Limiter switched on helps protect against that distortion when pushing bass hard.
No amount of boosting at 60Hz will produce deep bass on a speaker physically incapable of reproducing it — laptop and phone speakers in particular often can't render true sub-bass regardless of how far you push the low band.