B&C 6NDL38 Studio Subwoofer

"B AND C 6.5-in Woofer w/8 Ohms Impedance & 300 Watts Continuous Power Handling Capacity & Neodymium Ring Magnet - 6NDL38 6.5-in Woofer w/4 Ohms Impedance & 300 Watts Continuous Power Handling Capacity & Neodymium Ring Magnet * Nominal Outer Diameter - mm (in): 170 (6.5) * Continuous Power Handing Capacity: 300 * Nominal power handling: 150 Watts * Frequency Response: 70 - 5000 Hz * Sensitivity (1W/1m): 91.0 dB * Nominal impedance: 4 Ohms * Minimum impedance: 3.5 Ohms * Winding material: Copper * Winding depth - mm (in): 12.0 (0.5) * Voice Coil Diameter - mm (in): 38 (1.5) * Cone Shape: Exponential * Surround Shape: Roll * Former Material: Kapton * Magnetic gap depth - mm (in): 6.0 (0.25) * Flux Density - T: 1.15 * Spider type: Single * Pole Design: T-Pole Recommended Enclosure: 9.0 (0.32) Recommended Tuning in Hz: 62"