If your goal is to improve your speakers based system (as opposed to headphones based system) than the first step is acknowledging that your listening room is the weakest element of your audio system.
Unless it is at least 10-12 meters long, 7-8 meters wide and 3,5 meters high, the room is always a problem.
The second step is learning some the basics about acoustics.
But in wrap, there are three steps to improve your listening experience.
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1 : listening position is key (sitting against the walls or in middle of the room will always be a problem).
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2 : careful speakers positioning
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3 : acoustic treatment
Avoid any kind of DSP “tweakery”, at least not if you haven’t gone through the above steps. Even so, playing with a DSP isn’t easy. In fact it isn’t easy at all…
In order to go through the above steps I’d suggest to browse the following thread. I posted some useful links. You’ll find there all the needed info.
If your goal is to improve your listening experience, room treatment is, in my opinion, the best way to reach it.
I would never buy a system like the one I have now if my listening room wasn’t treated. It’s like buying a nice Porsche GT Pro and using it in a logging road or forest trail.