Hi Vivek,24x16x11 moved the red cross in the bolt area. Honestly I cant deduce anything from it.
View attachment 57195
To be honest I don't know much .
Some reading might help.As read from the internet" Rooms whose ratios fall within the shaded area will exhibit a favourably uniform distribution of modal frequencies ie: the bottom end will be less lumpy…" .So adjust the room size until you get the cross inside the bolt area.
I recently came across the you tube video I posted in my earlier post.Eventhough his videos are aimed at audio professionals,I found them very useful.They are technical and not voodoo as he says.Watch all his videos if you can.will help you for sure.