On Constitution class starships the dilithium crystal converter assembly was a separate unit from the intermix chamber. It consisted of the matter/antimatter integrator or reactor which channels the reactor energy to the dilithium crystal converter assembly to be energized into warp plasma for the warp engine nacelles. (TOS: "That Which Survives" , "Elaan of Troyius" ) The dilithium articulation frame was housed inside the M/ARA, behind the dilithium chamber hatch. (TNG: "Skin of Evil" , "The Drumhead" ) On monitors it was also displayed as matter/antimatter input system. (ENT: "The Catwalk")