The K&M 11905 is a high-quality sound insulation panel designed specifically for orchestra chairs with a backrest, helping musicians reduce direct sound exposure and improve personal monitoring comfort. Finished in black, it features an effective acoustic foam element mounted on a stable frame that attaches securely behind the player, absorbing excessive volume from surrounding instruments without affecting mobility or posture. Ideal for orchestras, rehearsal rooms and ensemble settings, it provides a practical, unobtrusive solution for protecting hearing and creating a more controlled acoustic environment.