Getting really tight lows is really easy when you are recording direct. Getting really tight lows live, IMHO, is difficult to impossible.
Start with a bass that produces the desired tone and response. This includes consideration for the string choice, age of the strings, and setup. It also includes how you adjust the bass...solo or fade toward the bridge pickup for more punch.
Next play with a technique that generates the desired response. I originally played with relatively straight plucking fingers. I found that using arched plucking fingers produces a punchier tone and also allows a more variety in the range of attacks I can produce. Playing closer to the bridge generates a drier, punchier sound with leaner lows.
Apply appropriate effects such as EQ, drive, and compression.
For live work, you have control over which amp and cab you choose. Again, choose gear that can produce the desired tone and response.
You also have control over how you set up and adjust the rig. By set up, I mean how you position and aim the speakers. In my experience placing a cab flat on the floor tends to give you a looser by lower sound. Tilting a cab to aim at your head increases the amount of high mids and treble you hear. Elevating the cab reduces and contours the lows. The set up option that works best for you depends on your tone goals and what part of the frequency spectrum you focus on. For the record, I prefer both elevating the cab and tilting it back to aim at my head.
What you hear on stage is a combination or ratio of direct sound and reflected sound. As the decay time increases, you hear more reflected sound. Elevating the cab and aiming it at your head increases the amount of direct sound. So you may take a situational approach and change your setup depending on room acoustics.