RCF LF21X451 21-inch Sub Woofer 2000 Wrms 4000 Watts Max 4.5″ Fiberglass Inside | Outside Copper Voice Coil Dual Forced Air Vent 8 Ohm

About this item FEATURES || 4.5 – inch fiberglass Inside/Outside copper voice coil || 4000 Watt continuous program power handling || 97 dB Sensitivity || 28 Hz – 1 kHz Frequency range || Dual-forced air ventilation for minimum power compression || Dual spider designed with silicon based damping control || BL of 30.5 Txm to provide a faster and accurate low frequency || GENERAL SPECIFICATIONS || Nominal Diameter : 530 / 21 mm/inch Rated Impedance : 8 Ohm || Program Power : 4000 W AES || Power handling capacity: 2000 W AES || Sensitivity : 97 dB || Frequency Range : 28 Hz ÷ 1000 Hz || Effective Piston Diameter : 470 / 18.5 mm/inch || Max Excursion Before Damage (peak to peak) : 54 / 2.12 mm/inch || Minimum Impedance : 6.7 Ohm || GENERAL SPECIFICATIONS || Voice Coil Diameter : 115 / 4.5 mm/inch || Voice Coil Material : Copper || Voice Coil Winding Depth : 34 / 1.33 mm/inch || Number of layers : 2 || Kind of layer : inside / outside || Top Plate Thickness : 15 / 0.6 mm/inch || Cone Material : No pressed pulp || Cone Design : Curved || Surround Material : Polycotton || Surround Design : Triple roll || PARAMETERS || Resonance frequency: 28 Hz || DC resistance: 5.4 Ohm || Mechanical factor: 6.9 || Electrical factor: 0.39 || Total factor: 0.37 || BL Factor: 30.5 T · m || Effective Moving Mass: 355 g || Equivalent Cas air load: 385 liters || Effective piston area: 0.173 m² || Max. linear excursion (mathematical): 13.5 mm || Voice – coil inductance @ 1kHz: 2.9 mH || Half-space efficiency: 2.2% || MOUNTING INFORMATION || Overall Diameter: 547 / 21.5 mm/inch || Bolt Circle Diameter: 527 / 20.7 mm/inch || Bolt Hole Diameter: 6.5 / 0.25 mm/inch || Front Mount Baffle Cut-out: 512 / 20.1 mm/inch || Rear Mount Baffle Cut-out: 512 / 20.1 mm/inch || Depth: 230 / 9.05 mm/inch || Volume occupied by the driver: 6.5 / 0.229 liters/ft³ || Net Weight: 15.5 / 34.0 kg/lbs || SHIPPING INFORMATION || Shipping weight: 17.59 / 26.6 kg/lbs › See more product details Product information Collapse All Expand All Connectivity Item details Sound Quality Warranty & Support Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here. Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service. Feedback Would you like to tell us about a lower price? Additional details Power Measurements