Thanks guys!
LR, I bought 5 boxes of 6x2" so I've tried a lot of positions. The front left was the most effective for a single box.
I'm slowly converting those boxes into panels.
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I built 8 so far, shooting to have another 8ish done next week. I estimate I'll need 14-18 2x4' panels to get the reverb to a good level. The lower frequencies I'm just going to have to live with for now.
Acoustic treatment is a tough sell until, you experience music in a treated room. It's all over after that, you become obsessed with it.
The cost per 25.25x49.5" panels are just under $30 each. that includes 703, fiberglass, staples, wood, wood glue, nails and acoustically transparent cloth.
tools used: chopsaw, drill, hammer, stapler, scissors, tape measure and pencil