Abstract: An apparatus is provided for maximizing the punch of any double membrane drum and simultaneously minimizing the ringing of the drum. An insert is provided having a body adapted to be slid into an opening formed in either the batter membrane or resonant membrane of the drum. The insert is held in contact with the membrane by one of several mounting techniques. The weight of the insert and the length and width of the body of the insert are sized in a manner to increase the “punch” of the drum and to minimize “ringing” of the drum. The insert may be retrofitted into an existing drum or attached to a batter head membrane or resonant membrane during original manufacture of the drum. The insert may be used with drum openings of any shape by making the cross-sectional shape of the insert conform to the shape of the drum opening.

Abstract: An apparatus is provided for lowering the fundamental frequency of a cajon drum. A first side wall of the cajon drum is the drumhead. An opening is formed in a second side wall, wherein the opening may be circular, oval, rectangular or other shape. An insert having a cross-section conforming to the shape of the opening is slid into the opening and mounted to the side wall in which the opening is formed. Various techniques for connecting the insert to the side wall of the drum are disclosed. The insert may be fitted into the drum opening during the initial manufacture of the drum.