The cheapest thing anyone and everyone can do to make their audio sound better is to treat their room with acoustic panels, bass traps, etc. They can be made easily with goods from home depot.
If you can walk into your room and clap your hands and let out a big Whooop! 99% of everyone here will hear a very fast echo and ringing. Until you fix that the money you spend on audio gear unless it's headphones only will never reach it's potential.
Contrary to what you might think even in a small den or bedroom, placing acoustic panels around the room will actually make the space sound bigger and sort of endless whereas before it sounded small and boxy.
For a couple hundred bucks you will transform the sound. Listen to any youtube video these days from people working from their homes. Someone not in the media. You will hear the boxy room sound. Well guess what, your sound system sounds bad in that room too unless it is incredibly advanced and has analyzed the room and corrected for it.
Here is the style I am speaking of
https://www.youtube.com/watch?v=fo8zhjiBvT0 notice the sound of his room. That is a classic sound of an untreated room. He simply has one panel on the wall to show what he made. There are varieties to be made but that box with Roxul and some material from Walmart is cheap and easy and works great. Many more vids on youtube.
Some of the basic science can be found here.
https://ethanwiner.com/basstrap_myths.htm
A down to earth review of teh whole room situation can be found here for a small studio but a lot carries over. Plus he's an interesting speaker ( no pun ) that has made his living with sound.
https://www.youtube.com/watch?v=1d9WmjTJniI
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