RCF 12" Speaker, 350W, 101dB, 60-2000Hz, X-max 3.5mm, weight 11.5kg Experience exceptional efficiency and extended linearity with this mid-bass transducer. The design includes a radiator for efficient heat dissipation and an aluminum voice coil for high sensitivity and a properly aligned Q factor. The Shallow Triple-roll surround minimizes midrange distortion, while the fiberglass former voice coil, polycotton suspensions, and treated cone ensure high power handling capabilities. Features: - 4-inch fiberglass former, edgewound aluminum voice coil - 700W continuous program power handling - 101 dB Sensitivity - 60 Hz – 2 kHz Frequency range - Shaped Shallow Triple-roll damped surround - Inverted dust cap General Specifications: - Nominal Diameter: 300 / 12 mm/inch - Rated Impedance: 8 ohm - Program Power: 700 W AES - Power handling capacity: 350 W - AES Sensitivity: 101 dB - Frequency Range: 60 Hz ÷ 2000 Hz - Effective Piston Diameter: 260 / 10.2 mm/inch - Max Excursion Before Damage (peak to peak): 40 / 1.6 mm/inch - Minimum Impedance: 7.2 ohm - Voice Coil Diameter: 100 / 4 mm/inch - Voice Coil Material: Aluminum - Voice Coil Winding Depth: 12 / 0.5 mm/inch - Number of layers: 1 - Kind of layer: outside - Top Plate Thickness: 10 / 0.4 mm/inch - Cone Material: No pressed pulp - Cone Design: Curved - Surround Material: Polycotton - Surround Design: Triple roll Thiele/Small Parameters: - Resonance frequency: 62 Hz - DC resistance: 5.2ohm - Mechanical factor: 4.1 - Electrical factor: 0.29 - Total factor: 0.27 - BL Factor: 18.8 T · m - Effective Moving Mass: 50 g - Equivalent Cas air load: 52 liters - Effective piston area: 0.053 m2 - Max. linear excursion (mathematical): 3.5 mm - Voice-coil inductance @ 1kHz: 1.25 mH - Half-space efficiency: 4.12% Mounting information: - Overall Diameter: 320 / 12.6 mm/inch - Bolt Circle Diameter: 296-304 / 11.7-12 mm/inch - Bolt Hole Diameter: 7 / 0.3 mm/inch - Front Mount Baffle Cut-out: 286 / 11.3 mm/inch - Rear Mount Baffle Cut-out: 284 / 11.2 mm/inch - Depth: 146 / 5.7 mm/inch - Volume occupied by the driver: 2.9 / 0.10 liters/ft3 - Net Weight: 11.5 / 25.3 kg/lbs Shipping information: - Shipping weight: 12 / 26.4 kg/lbs