RCF 15" Speaker, 850W, 100dB, 40-2000Hz, X-max 5.5mm, weight 7.5kg The MB15N401 is a neodymium midbass speaker with a linear frequency response and very high efficiency. To achieve this performance, the magnetic structure utilizes a demodulation ring and a fiber-loaded exponential cone assembly, along with a high excursion triple roll, constant geometry surround. The fiberglass former and inside/outside copper voice coil provide excellent power handling while maintaining a lightweight mass and proper Q factor for bass alignment. The demodulation ring ensures fast time response and low distortion. Features: - 4-inch fiberglass inside/outside copper voice coil - 1700W continuous program power handling - 100 dB sensitivity - 40 Hz – 2 kHz frequency range - Dual-forced air ventilation for minimum power compression - Triple roll surround and exponential cone geometry - Aluminum demodulation ring General Specifications: - Nominal Diameter: 380 / 15 mm/inch - Rated Impedance: 8 ohm - Program Power: 1700 W AES - Power handling capacity: 850 W AES - Sensitivity: 100 dB - Frequency Range: 40 Hz ÷ 2000 Hz - Effective Piston Diameter: 340 / 13.4 mm/inch - Max Excursion Before Damage (peak to peak): 40 / 1.57 mm/inch - Minimum Impedance: 6.4 ohm - Voice Coil Diameter: 100 / 4 mm/inch - Voice Coil Material: Copper - Voice Coil Winding Depth: 18 / 0.70 mm/inch - Number of layers: 2 - Kind of layer: inside / outside - Top Plate Thickness: 12 / 0.47 mm/inch - Cone Material: No pressed pulp - Cone Design: Curved - Surround Material: Polycotton - Surround Design: Triple roll Thiele/Small Parameters: - DC resistance: 5.0 ohm - Mechanical factor: 7.7 - Electrical factor: 0.20 - Total factor: 0.19 - BL Factor: 26.1 T · m - Effective Moving Mass: 100 g - Equivalent Cas air load: 136 liters - Effective piston area: 0.091 m2 - Max. linear excursion (mathematical): 5.5 mm - Voice-coil inductance @ 1kHz: 1.6 mH - Half-space efficiency: 4.86% Mounting information: - Overall Diameter: 393 / 15.5 mm/inch - Bolt Circle Diameter: 371-376 / 14.6-14.8 mm/inch - Bolt Hole Diameter: 6.5 / 0.25 mm/inch - Front Mount Baffle Cut-out: 354 1 / 13.9 mm/inch - Rear Mount Baffle Cut-out: 354 1 / 13.9 mm/inch - Depth: 158 / 6.2 mm/inch - Volume occupied by the driver: 3.8 / 0.13 liters/ft3 - Net Weight: 7.5 / 16.6 kg/lbs Shipping information: - Shipping weight: 8.1 / 18 kg/lbs