Reddit reviews Lycra Matte Milliskin Nylon Spandex Fabric 4 Way Stretch 58" Wide Sold by The Yard Many Colors (White)
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Use a layer of this white over this black, according to the wizards over at http://www.avsforum.com/forum/110-diy-screen-section/
I was able to find a very similar- 80% nylon, 20% spandex, matte, 4 way stretch, milliskin fabric over on amazon because i had a gift card here and here.
This will give you an acoustically transparent screen with great contrast and not see through.