The compression driver with good quality and cheap price, manufacturing by China factory.Model: TD-BY2501 compression driverThroat diameter: 25mmMominal Impedance: 8OhmRMS power: 60WContinuous power handling: 120WFrequency range: 1-18KhzVoice coil Diameter: 44mmWinding material: AluminiumDiaphragm material: PolyimideNet weight: 2.1kg