Blastking PROFILE21 21" 4000 Watts High Output Woofer — 97.2 dB, 32 Hz - 1500 Hz

Overview The Blastking PROFILE21 is a 21-inch high-output woofer built for very low frequency reproduction in reflex or horn-loaded enclosures. It delivers 4000 Watts Program Power with a rated power handling of 2000 Watts and a sensitivity of 97.2 dB across a frequency range of 32 Hz - 1500 Hz. Designed with a heavy-duty ferrite magnet and a die-cast aluminum frame, this transducer offers robust performance with low distortion and forced air ventilation for thermal management. Key Features - 5 Voice Coil - 4000 Watts Program Power - 97.2 dB sensitivity - 32 Hz - 1500 Hz frequency response - Forced air ventilation Electrical / Mechanical Specifications - Nominal Basket Diameter: 533 mm / 21 inch - Rated Impedance: 8 ohm - Rated Power Handling: 2000 Watts - Program Power: 4000 Watts - Sensitivity: 97.2 dB - Frequency Range: 32 hz - 1500 hz - Magnet: 200 Oz / 280x140x25 mm / 11x5.5x1 inch - Minimum Impedance: 5.3 ohm - Voice Coil Diameter: 127 mm / 5 inch - Voice Coil Material: Fiberglass - Voice Coil Length: 25 mm / 1 inch - Number of Layers: 2 - Kind of Layers: inside/outside - Top Plate Thickness: 15 mm / 0.59 inch Thiele-Small Parameters - Resonance Frequency fs: 32 hz - DC Resistence Re: 35.3 ohm - Mechanical Factor Qms: 35.04 - Electrical Factor Qes: 30.4 - Total Factor Qts: 30.37 - BL Factor BL: 332.4 T m - Effective Moving Mass Mms: 3278.8 gr - Equivalent Cas Air Load Vas: 3289.6 liters - Effective Piston Area Sd: 30.123 M - Maximum Linear Excursion Xmax: 39 mm - Half-Space Efficency Eff: 32.2 % Mounting Information - Overall Diameter: 552 mm / 21.73 inch - Bolt Circle Diameter: 527 mm / 20.7 inch - Bolt Hole Diameter: 6.5 mm / 0.25 inch - Front Mount Baffle Cut-Out: 512 mm / 20.16 inch - Rear Mount Baffle Cut-Out: 512 mm / 20.16 inch - Depth: 230 mm / 9.05 inch Physical Information - Net Weight: 22.8 Kg / 50.3 Lbs - Shipping Weight: 25.4 Kg / 56 Lbs - Dimension WxDxH: 610x610x330 mm / 24x24x13 inch Product Notes The PROFILE series from Blastking includes 12", 15", 18" and 21" models, all engineered for deep bass output with high power capacity and minimal distortion. These drivers are optimized for applications requiring substantial low-frequency SPL and are recommended for use in either reflex or horn-loaded cabinet designs.