The IMP2 Impedance fixture fulfills the role of sense resistor and is a convenient accessory when measuring impedance with an ABTEC Series analyzer. The IMP2 provides a choice of two sense resistors, with values of 1.0 Ω and 0.1 Ω respectively. Double-banana connectors on the rear provide connections for the driver and a power amplifier，and XLR connectors on the front of the fixture is connected with the analog input of the audio analyzer to detect the voltage of the inductive resistance and the voltage at both ends of the loudspeaker.