.....Yaji, welcome to Audioholics, should I call you Saheeb?, and you could try hanging tasteful oriental rugs on the side walls up in the front of the room to catch what would be the first bounce from the mains....same with rear surrounds, and let those front-firing subs from the front RIP straight into the sweet-spot where you're sitting....with down-firing subs, oh for joy, hang a tasteful bathmat down low on he wall catching the first bounces of the down-firing in a tall room, and that would be a down-firing sub that fires into it's own plate, you'll probably want to raise the volume of the sub a bit after doing this....if you kill the first bounces down low in the room from all the voices, reflections from the ceiling would probably be nice.....