Bumped and Vented Motor Structure Specially Treated Purple Cloth Edge Suspension 50 oz. Stronium Magnet Structure 1.5' High Temperature Aluminum Voice Coil Bumped Yoke Plate For Extended Excursion 8 Ohms Impedance Mounting Depth: 3.375' 100 Watts RMS/200 Watts Peak Power Frequency Response: 45Hz-3.8kHz Sensitivity: 96dB