A standing wave is a resonance frequency that is strongest below 300 Hz, creating a boom sound.
Standing waves cause musical notes to boom out into a room. An amplified bass guitar is a typical culprit, since the instrument produces many of the low tones that comprise a standing wave pattern.
Room size is an important distinguishing factor for achieving standing wave control. Rooms where length, width and height are not multiples of each other are the best types of rooms for avoiding this problem.
Recording in a large room can help prevent standing waves from occurring. Bass traps are also effective tools for absorbing standing waves.
Non-parallel walls do not prevent standing waves from occurring. Standing wave reduction is best achieved in a large room that has dimensions, for instance, of 10-foot height, 16.2-foot width and 26.2-foot length.