Sound treatment isn't sound proofing to contain the music.
Sound treatment helps to control the frequencies, room correction to create a flat response.
The lower the frequency, the hard to control as it ripples like a drop of water. It needs distance.
a drop of water in a small bowl, will ripple and hit the edge of the container.
a drop of water in a pond will have the ripple loose it's energy long before is it reaches the edge.
Treatment, proper treatment, can help with the small container you are in...
Is it important ???
Absolutely important.
You find your mix is boomy, because your lows / midlows, are canceling since the space is small.
They smack into each other and cancel, or change the actual sound so much, you push those frequencies so "you hear them correctly in that room"
But, when taken out of that room, it translates poorly...
So, your in a mixing game, only guessing at what really needs to be done to a track.
Doing this on many tracks, will increase the issue,
Also, you push your speakers hard with incorrect low / midlow levels. So don't turn up too loud.
take a mix you have that sounds good, now keep your head in the center and move forward til almost having your head with each speaker on either side.
I'll bet you get an idea of the lows your actually pushing. There is a huge build between the speakers and the wall even the upper / midhigh frequencies have no time to ripple out...
That said, you can learn to mix on speakers, in that room. It will just never translate properly, until you treat the room.
You will train your ears to hear allowing you to advance in mixing to a point.
When the point comes, you'll want treatment, lol... You'll want good translation.
You can be creative nothing can hold that back. It might discourage creativity if / when the issues show and you let them get to you. But it can't stop you.
Here's a good place I used for treating my room.
Acoustic Panels | Bass Traps | Diffusors | GIK Acoustics
Here's a google search showing video how correct treatment can help.
https://www.google.com/search?q=gik...rceid=chrome&ie=UTF-8#q=gik+acoustics&tbm=vid
Just a little info
There is soo much more to all this, but, it's a start and hopefully I haven't wasted my time or bored you to tears, lol,,,
I'm just a guitar player that got into mixing when I broke my back.
Can't stand since I lost my left leg nerve, so live changed.
Music found another way into my life. it helps me keep sane, lol,,,
Most of all man, Have fun ,,, thats why we do what it takes to have fun...