(PIC inside) My Theater and What will Bass Traps do for me?

[bizmord]

Hi guys,

So before I go ahead and buy 3 of these Auralex SonoLite 24 x 24 x 3 Inches Bass Traps .... (http://www.amazon.com/gp/product/B00...=ATVPDKIKX0DER)

I am curious ... if I place those in the corners, what will it really do? Maybe better question will be ... what should I look for once I place these? I was thinking to place one right behind the sub, two in the opposite corners and one in the far side wall, near the corner. Actually right behind the upright piano.


Here is my set up https://www.blu-ray.com/community/gallery.php?u=263096

Any feedback will be much appreciated.
Is it worth spending $200?

thank you.