Reply to Room/Sound treatment

So a local council music production thing lost its funding last week, so they were punting everything between the two rooms for pennies, managed to pick up a fair bit of room treatment foam and a Rhode mic, now, where to put the insulation?

I picked up 4 corner bass traps,
http://www.thomann.de/gb/auralex_aco...charcoal_4.htm

Some wedges,
http://www.thomann.de/gb/auralex_aco...s_charcoal.htm

And i dont have a clue what these are,
http://www.thomann.de/gb/auralex_aco...r_diffusor.htm

There isnt enough bass traps to fill wall to wall on all 4 corners, im assuming the ones behind the speakers are more important?
The wall behind my speakers is a window with wooden blinds, if ive got them slanted thats pretty good deadening isnt it?, the wall thats left will get covered in the wedges.

And the third, i dont even know what they are lol,