RCF MB12N251, Mid-Bass 12", 300 Watt RMS / 8 Ohm

The MB12N251 is a 12” neodymium mid-bass driver with an excellent linearity, good efficiency and high power handling capabilities. The 2,5” aluminium voice coil combined with a high strength fibreglass former allows high efficiency and good frequency response extension. Aluminium basket and magnetic assembly design provide an excellent heat dissipation and very low power compression. The Triple-roll shape combined to spider design offer very low distortion and extended low frequency reproduction.

Features 2.5-inch , fibreglass former, aluminum voice coil 600 Watt continuous program power handling 98 dB Sensitivity 45 Hz - 3.0 kHz Frequency range Forced air ventilation M-roll surround and exponential cone geometry

General Specifications Nominal Diameter: 300 / 12 mm/inch Rated Impedance: 8 Ohm Program Power: 600 W AES Power handling capacity: 300 W AES Sensitivity: 98 dB Frequency Range: 45 Hz ÷ 3000 Hz Effective Piston Diameter: 260 / 10.2 mm/inch Max Excursion Before Damage (peak to peak): 38 / 1.49 mm/inch Minimum Impedance: 6.4 Ohm Voice Coil Diameter: 64 / 2.51 mm/inch Voice Coil Material: Aluminum Voice Coil Winding Depth: 14 / 0.55 mm/inch Number of layers: 1 Kind of layer: outside Top Plate Thickness: 9 / 0.35 mm/inch Cone Material: No pressed pulp Cone Design: Curved Surround Material: Polycotton Surround Design: Triple-roll

Thiele/Small Parameters Resonance frequency: 50 Hz DC resistance: 5.1 Ohm Mechanical factor: 5.4 Electrical factor: 0.36 Total factor: 0.34 BL Factor: 15 T · m Effective Moving Mass: 49 g Equivalent Cas air load: 83 liters Effettive piston area: 0.053 m² Max. linear excursion (mathematical): 4.8 mm Voice - coil inductance @ 1kHz: 1.3 mH Half-space efficiency: 2.70%

Mounting information Overall Diameter: 320 / 12.60 mm/inch Bolt Circle Diameter: 294.5-304 / 11.6-11.9 mm/inch Bolt Hole Diameter: 5.5 / 0.21 mm/inch Front Mount Baffle Cut-out: 288 / 11.3 mm/inch Rear Mount Baffle Cut-out: 288 / 11.3 mm/inch Depth: 130 / 5.1 mm/inch Volume occupied by the driver: 2.2 / 0.07 liters/ft³ Net Weight: 2.7 / 5.9 kg/lbs