A controlled impedance compressible electrical connector having a housing with at least one terminal receiving cavity which extends from a first surface of the housing to a second surface of the housing. A terminal assembly is positioned in each of the at least one terminal receiving cavities of the housing. The terminal assembly has a first fixed center terminal, a second movable center terminal, a fixed outer shell, a movable outer shell, and a resilient member. The terminal assembly is configured to allow impedance of the electrical connector to be maintained as the second movable center terminal and the movable outer shell are moved relative to the first fixed center terminal, the fixed outer shell and the housing.