Just to add to my post count and geek factor. For those wondering how printed fabric can possibly be acoustically transparent enough to work for acoustical panels, here are some graphs. Credit goes to mtbdudex from AVSForums for the research, graphs, and conclusion.
Midrange with Spoonflower Kona cotton cloth, baseline and @ 0, 45, 60 degrees
Tweeter with Spoonflower Kona cotton cloth, baseline and @ 0, 45, 60 degrees
Conclusion from the midrange/tweeter charts: Spoonflower Kona cotton cloth is AT and good to go for acoustic absorber panels usage.
