I picked up a 2402 to upgrade my extremely early (D123 S/n 511) C38 and it works, but the output is extremely low. It measures about 6.5 ohms. I took it apart and all looked good, I swapped in a different diaphragm from another tweeter from another speaker that works fine and the output remains low. The gap is clean. I'm stumped. Could the magnet have lost its mojo?