An electrical connector (9) has an insulative housing (1) and a plurality of subassemblies (3). Each subassembly has a base member (4), a first and second printed circuit boards (PCBs, 72, 73), a pair of insert portions (6) mounted on corresponding PCBs, and a plurality of terminals (5) insert molded in the insert portions. One of the insert portions has a plurality of first positioning posts (62) and first mounting holes (63), the other insert portion has a plurality of second positioning posts (67) and mounting holes (68) second stably engaging with the first mounting holes and the first positioning posts of the former. The base member has a plurality of magnetic coils connecting with the terminals.