a simulated rock speaker cabinet in the form of a natural rock has build - up portions of modeling clay which include a pattern of small diameter holes to form speaker grills at longitudinally spaced positions . a chicken wire ring provides structural reinforcement to the speaker cabinet . the artificial rock cabinet may be molded of various hydrolitic cements , magnesite cement , a suitable catalytic plastic resin to which pigment or other colorants may be added along with glass or rock chips , to provide the simulated rock cabinet with an external appearance which corresponds to various natural rocks . the speaker cabinet has speakers and the various electronic components of the speaker system housed within the speaker cabinet and may be coated with water - proofing and weather - proofing material with the speakers molded into the wells and facing the grills . an end plug may be adhesively sealed to the opening within the base of the speaker cabinet and suitably sealed by hydrostone or other cementous material .