americanaudiophile :
The suggested corner placement gives you the most sound it also gives you the worst quality of sound. If you are getting boomy sound from the subwoofer then you need to move it away from room boundaries (walls and floor).
Move the subwoofer away from any wall or the floor to reduce the output. Adjust the level of the subwoofer at each location before evaluating if you like it or not, Try firing the sub in a different direction. You can also try plugging the port of the sub. Rolled up socks or a piece of foam will work.
Placing the front channels 10' up is usually not the best way to go. If you can bring them down it would help. Level with the display or your ears is good. I usually suggest keeping the sub closer to the front speakers than the listener for a better blend.
Acoustic treatments for bass problems are likely way out of the price range of your system.
Thanks for your reply ...
I have No Luck ... I tried all the places, but no improvement
I am using Old Creative T6100 speakers, may be the quality of amplifiers/filters are bad
I tried will the below sound cards (do get surprise, why I brought this many, I am audiophile, included the reasons why I brought)
X-fi extreme gamer (First X-Fi card I brought)
X-fi extreme music (Particularly brought this for Built-in Dolby Decoder)
M-Audio rev 5.1 (Particularly brought this because it support 192 sampling)
SoundBlaster Z (Brought for Optical out)
coming back ...
With any of the sound sources, it is giving boomy re-sound, M-Audio little bit tolerable than X-fi
Due to all this, I hate woofer sound system, I am planning to replace this with non-woofer model (creative gigaworks model)