Audiophile - Acoustic Panels - 24" x 40" - 4 Pack - Sandstone

This review has three parts.1) the look of them is nice, yes...wife approved :) However for the price, I believe the build quality is very subpar. It has a stapled carboard backing that had come loose on a few of mine. zigzag picture hooks are OK2) Acousically, they made a big difference. I have a very small, reflective room which made it difficult for surround calibration. These deaden the reflections for the wall behind, making the rear surrounds very distinctive now3) why are these sold as a 4-pack? They're really two 2-packs taped together. I want to buy 2 more, but will not shell out the money to buy 4