The HushMat Speaker Wave Breaker Kit is used to treat standing waves or back waves in every speaker in your car, truck, boat, RV, office and home. Place it on the solid surface directly behind the speaker magnet to eliminate standing waves or back waves from that speaker. A standing wave is created when the speaker cone moves in and out, creating waves in 2 directions. The wave that moves out the front is called music. The wave that comes out the back of the speaker is called noise. This back wave reflects off the solid surface behind the speaker and bounces back to the front, essentially throwing the speaker out of phase. When a HushMat Wave Breaker pad is placed behind the speaker, these back waves are absorbed and broken up. This prevents the bounce back and therefore prevents the distortion. Wave Breaker is simple to use and easy to install it cuts with scissors. Then, just peel and stick. The special adhesive technology will keep the pads in place. Get all the music you paid for out of that speaker with these two 8 in. x 8 in. Wave Breaker pads from HushMat. Material: Rubber.