Phil,
I already have six 2'x4' acoustic panels so I know their value. The issue is how do I elegantly and conveniently mount one in front of the tv so I can easily remove and replace as needed. My equipment rack is in the way so I cannot use a stand.
I also have TacT so I can measure changes but that won't tell me what my ears will. Subtle nuances are lost in the gross frequency measurements. I find that TacT works best with a little help from room treatment.