My Gaming Setup - What is missing?

[Neoraf]

My audio system:
A decent receiver. Onkyo TR-SX606B, 7.1 with TrueHD and DTS-HD support.
Speaker System. JBL Balboa 30 series, Subwoofer: JBL ES150P

And I won't remove the white thing!!
It is the anchor of all this setup.
Everything is built around it!

Love!