There were never any one π, two π or two π tower kits or completed loudspeakers shipped with resistors installed internally on the woofer line.Some people put 20 ohm resistors across speakers with piezos, so maybe someone decided to install yours internally. If so, remove them.
Current models use a 0.5mH series coil in the woofer circuit, but older models don't have one. You can identify the driver by the label; Silver labels are the new ones. Models with silver label drivers have the coil, older ones don't.