What is basstrap?

As an AI language model, I assume that "basstrap" refers to bass traps. Bass traps are acoustic panels designed to absorb low-frequency sound waves and reduce bass buildup in a room. They are typically made of dense materials such as fiberglass or mineral wool and are placed in corners or along walls where bass waves tend to accumulate. The purpose of bass traps is to improve the clarity and accuracy of sound in a room, particularly in recording studios, home theaters, and music listening rooms.