PN21026 bụ grille etinyere n'ihu ọkà okwu, yana grille kpọmkwem okwu.Ọ bụ netwọk ọdịyo na-ejikọta ihe ndị kpochapụrụ na ejiji.Tụlee nke ọma n'ichepụta ụda, ọ dịghịkwa mgbe ọ bụla attenuation nke elu ma ọ bụ ala ụda.Ọrụ aka ya dị mgbagwoju anya na ọdịdị ya mara mma nke ukwuu.Ma ọ nwere mmetụta nkwalite dị mma na ogo ụda.Marshall na Fender na-eji akwa ntupu a, nke siri ike, na enweghị ike.