Small Room Optimization or Treatment

[svp]

Last night i watched some Anthony Grimani podcast about subwoofer, he said that 4 small subwoofer, and another 1 giant subwoofer for the really low end frequency and play with the crossover settings maybe?

What room? Is it some kind of cinema hall?
Your room is tiny by all the standards, especially if you watch podcast from US guy where he talks about typical huge rooms in that side of the pond.
You have two directions: make smart decisions or make expensive decisions. They may be not the same. 5 subwoofers is expensive decision.

 

[Ryanf7id]

This is the New RT60 Graph.. Something kinda off with my soundcard before..

How do you guys think about this graph looks?