A system for connecting a transducer array to a coaxial cable. A fanout flex circuit is electrically connected to the coaxial cable, to form one subassembly, and a transducer flex circuit is incorporated into a transducer stack in electrical connection with the transducer array, to form another subassembly. The fanout flex circuit has a row of terminals of first linear pitch at one end and a row of terminals of second linear pitch, less than the first linear pitch, at the other end. The terminals of first linear pitch are electrically connected to the wires of the coaxial cable. The terminals of second linear pitch are electrically connected to a row of free terminals of the same linear pitch on the transducer flex circuit. A layer of pressure-activated conductive adhesive is applied on one row of terminals and then the other row of terminals is pressed against the adhesive-coated row. Then the adhesive is cured, thereby mass-connecting the signal electrodes of the transducer array to the wires of the coaxial cable in one step by simply adhering complementary ends of separate flex circuits.