Well first off, what kind of speakers...and secondly...if your wondering about speaker placement...here is the "idea"...
For "small near field
studio monitors", you can be about 3 feet from. Medium sized monitors about 6 feet and large, well, build a "
professional"
studio...
NOW...you can't just have them "anywhere"...
You need to sit in the middle of left and right, middle of the room. AND, your
studio monitors need to be POINTING AT YOU. Meaning you are looking directly at them. Pointing them away from you is a no go, that's what you do in your living room for friends while you watch a movie.
Basic role of
thumb, your two speakers and your head need to be in a perfect triangle, and...you need to treat your room first, before you even think about mastering. I wrote a basic
concept at my site,
liftedCREATION - Building a Home Studio.
Even if you don't have pro-grade equipment, you should at least follow the basic science of sound and how it reacts and if you do, you will achieve better results.
Now, if you bought great studio monitors and failed to acoustically treat your room, then you need to re-setup your
studio and treat your room acoustically.
You can't just, "move your chair back", sure sure, you will be farther from the sound but the point is, mathematically, sound is a science, and it's best to learn it now than later. You want to be in the "
sweet spot" and you want to know how to achieve this.