What could be instead of side walls?

Although it's hard for me to understand your situation from your description without some clarification, I'm not sure I read it the same way as Rives. It reads to me as if both your speakers are actually quite far away, in your estimation, from both of the side walls. I'm getting that if you moved each speaker closer to the sides, they would become too far apart from each other in the middle, and if you moved the whole system closer toward one corner, you would have an asymmetrical left/right proximity imbalance regarding the side walls. You seem to ask if this is a good thing, or whether you should introduce closer side boundaries somehow. There also seems to be some possibility as to whether maybe your side walls are of unequal lengths or heights, or maybe aren't parallel.

In general, with the vast majority of typical direct-radiating box-type speakers, having a large distance from the speakers to the side walls would be a desirable set-up situation (as would equal distancing from the sides). If the distances are large (over 5-6 feet), then I doubt any asymmetricality would cause any problems (and non-parallel could actually help). If that describes your layout, then I would focus first on speaker separation and aiming, listening chair positioning, and any possibly interfering room furnishings between the speakers and the chair. Also, the floor should not be a bare acoustically reflective surface in front of the speakers, but covered with a rug or carpet, if it is not already. Your description does seem to indicate that your speakers are not too close to the front wall.

You should let us know what model the speakers are in this case, the size and shape of the room, what the treatments and furnishings near the speakers are, exactly how the speakers are positioned and aimed, relative to the room, the listener, and each other, and also the listener position relative to both the room and any large furnishings. Specific measurements and dimensions would be nice. Also, a more detailed description of the symptoms you are hearing would be helpful to us.

Thanks everyone.
I believe that it's everything almost to the point.
My speakers havn't changed and my system is available to look up through the link.
The listening distance is very short which is 5' maximum.
The speakers are placed 9...10' apart from each other.
The side walls are 11' away from left speaker and 10' away from the right speaker. There is a computer work-station attached to the right side wall and made of wood-composit. The distance between the work-station table and the right speaker is approximately 4' The floor is hardwood and it's flexible like a mud.

All else equal, I'd move the speakers closer together so they are only about 5-6' apart if your listening position is only 5' from the speaker plane. It's good to start from an equalateral triangle and then tweak from there. Also start with the speakers tilted towards you. Again, experiment from that initial position.

As a next step, you may want to check the overall reverb characteristics. How far is the listening position from the rear wall? How far are the speakers from the front wall? Depending on that, you might be able to do some relatively inexpensive experimentation with side panels (reflecting vs. diffusing or absorbing) to see if that tightens things up a bit. A lumber yard (plywood sheets) and a couple of friends could do a lot here for purposes of seeing if that helps without spending much money. Lots of ways to go, but I'd move the speakers closer together first. Good luck. Let us know your progress.

Can't agree with Oz's suggestion about introducing side panels, but he's absolutely right about your speaker separation. A chaotic, out-of-focus stage as you described would definitely result from listening at only 5' away while having a separation of twice that much. Try to move your listening position at least a couple of feet farther away if you can without positioning your head closer than two feet from the rear wall, but in either case, do what Oz says and try moving the speakers so they form an approximate equalateral triangle with the listener, then tweak the separation from there. You also don't tell us about the speaker aiming, but straight-ahead firing will create a more diffuse soundstage, while toeing them in to point more at your ears will increase focus. In addition, in a floor covering of some kind is very desirable to use on top of your wooden floor to provide some acoustic absorption, and should be placed underneath the speakers as well to break up the energy transfer from the cabinets to the springy floor (do not use speaker spikes in this situation, but mass-loading the cabinet bottoms with sandbags, if applicable, could help). If you can't get a rug to go beneath the speakers as well as in front of them, then maybe try out Vibrapods underneath, but as it is now, your floor is probably storing and releasing delayed energy, both acoustically, and vibrationally back into the speaker cabinets. The heavier weight of rug you get, the more it will help this. Good luck, and let us know what you do and what happens.

thanks for a great conversation,
as you might know that totem forest speakers have ball bearings. despite that i still use the vibrapods under these ball bearings.
my speakers are directed towards the focus about 6 degrees from normal.
to place them closer to each other i face different problem where i have a 2ch home theater with modest 27" Sony Wega TV. manufacturers say that these speakers are shielded but moving them too close to the TV screen does create screen distortions.