I built some sound panels recently and have been trying to figure out what fabric to use... Caveat, I am using Spoonflower to do some custom prints. I did test swatches in basic cotton and satin. Cotton passes air better, but detail/color isn't as good. Satin looks much better, but is shiny and doesn't pass air as well. I didn't get a test swatch of the cotton poplin, but is probably a good compromise between the two. Thread count: Basic cotton - 78x76 Satin - 165x79 Cotton poplin - 133x72 Pics: Basic: Satin: Poplin: Thoughts?