Product Name: Impedance Fixture Model NO.: IMP2 Trademark: ABTEC Transport Package: Box Origin: China HS Code: 903089909 Product Description 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 Ohm and 0.1 Ohm 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.Background KnowledgeThe main performance indexes of the loudspeaker include: sensitivity, frequency response, rated power, rated impedance, directivity, distortion and other parameters. At present, when testing the relevant performance indexes of loudspeakers, people usually only pay attention to the frequency response curve and ignore the discussion of the impedance curve. The impedance characteristic of loudspeaker is very important, and many defects in listening sense can be reflected from the impedance curve. For example, the rated impedance, resonant frequency and quality factor of the loudspeaker can be obtained from the impedance curve. The frequency response of the loudspeaker is also closely related to the impedance curve. The resonant frequency on the impedance curve is the lower limit of the loudspeaker frequency response curve, and the small peak in the high frequency region of the impedance curve corresponds to the high frequency peak of the loudspeaker frequency response curve.