Speaker 12", 300W, 98dB, 45-300Hz, X-max 4.8mm, weight 2.7kg The MB12N251 is a 12” neodymium mid-bass driver known for its exceptional linearity, high efficiency, and robust power handling capabilities. Featuring a 2.5” aluminum voice coil paired with a durable fibreglass former, it delivers high efficiency and extends frequency response. The aluminum basket and magnetic assembly design ensure excellent heat dissipation and minimal power compression. Its Triple-roll shape and spider design contribute to 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: 5.1ohm • 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 • Effective 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 Shipping information: • Shipping weight: 3.5 / 7.7 kg/lbs