Home studio acoustic treatment

[Dolese]

Guys, I have roughly a 19' by 14' room. Mixing desk close to center and monitors creating an equilateral triangle from the mixing position. However, in the mixing position, bass presence is slim to say it best, but mix (bass to treble)sounds better about 4' behind me while mixing.( against the back wall)

When I get to a computer I will upload a drawing, to this post, of the room layout.

I just wanted to get some thoughts. I've been designing some real nice kicks lately, but this frequency issue is driving me nuckin futs.

[camsr]

Putting speakers in the middle of a room will cause a modal null.
http://en.wikipedia.org/wiki/Room_modes
The picture on that page shows modal null in the center of the room.