Features:

• 2,000 Hz – 40,000 Hz frequency response
• DuPont KAPTON material used as sound film substrate
• Japanese Aluminum foil used as Conductive Lining Material 
• MRS (Maximum Radiating Surface) planar sound technology
• Ultra-thin laminated aluminum diaphragm weighing just 25Milligrams
• Excellent Transient Response 
• Linear impedance
• Solid Aluminum Face Plate with Metal Grill 
• Powerful, Neodymium magnet structure for high flux and low weight
• Ultra Low distortion and high efficiency

Specification:

• Impedance  : 4ohms
• Power Handling :  15watts(RMS),30watts( max)
• Sensitivity : 91dB@1W/1m
• Frequency Response : 2,000 - 40,000Hz
• Diaphragm:  Kapton & Alumium foil
• Magnet System :  Neodymium
• Dimensions Overall diameter: 4 Inches
• Recommend Crossover Frequency :  2.5KHz 

Price Dsplayed Is For a Single Unit