The compression driver with good quality and cheap price, manufacturing by China factory. Model: TD-BY2501 compression driver Throat diameter: 25mm Mominal Impedance: 8Ohm RMS power: 60W Continuous power handling: 120W Frequency range: 1-18Khz Voice coil Diameter: 44mm Winding material: Aluminium Diaphragm material: Polyimide Net weight: 2.1kg