Primacoustic CUMULUS Tri-Corner Trap, 24" w/ Mounting Kit - Grey, 2 PackThe Cumulus is a high performance tri corner bass trap that is designed to seamlessly integrate into most rooms without interfering with the natural room dcor. (Sold in pair) Given the choice, acousticians will always employ corners for acoustic sound control. This is primarily due to the way sound propagates inside a room, whereby the walls and ceiling act as waveguides that drive sound to the corners where it gathers. The Cumulus nestles high, up