About: BlastKing Profile21 21″ 2000W RMS High Output Woofer - 8 Ohms (Each)

The BlastKing Profile series brings high output, low frequency woofers in 12”, 15”, 18” and 21” options. These transducers are capable of very low frequencies and are intended for use in a reflex or horn loaded cabinets. They are all made in a high-quality die cast aluminum frame and boast a heavy-duty ferrite magnet that allows for increased power ratings. The Profile transducers are perfect for those needing high level, low frequency output transducers with very low distortion.

Specifications:

• Nominal Basket Diameter: 21" (533 mm)
• Rated Impedance: 8 ohm
• Rated Power Handling: 2000 Watts
• Program Power: 4000 Watts
• Sensitivity: 97.2 dB
• Frequency Range: 32Hz - 1500Hz
• Magnet Weight: 200 Oz
• Magnet Dimensions: 11" x 5.5" x 1" (280 x 140 x 25 mm) 
• Minimum Impedance 5.3 ohm
• Voice Coil Diameter: 5" (127 mm) 
• Voice Coil Material: Fiberglass
• Voice Coil Length: 1" (25 mm)
• Number of Layers: 2
• Kind of Layers: Inside/Outside
• Top Plate Thickness: 0.59" (15 mm)

Thiele & Small Parameters:

• Resonance Frequency (Fs): 32Hz
• DC Resistence (Re): 5.3 ohm
• Mechanical Factor (Qms): 5.04
• Electrical Factor (Qes): 0.4
• Total Factor (Qts): 0.37
• BL Factor (BL): 32.4 T – m
• Effective Moving Mass (Mms): 278.8 gr
• Equivalent Cas Air Load (Vas): 289.6 liters
• Effective Piston Area (Sd): 0.123 M²
• Maximum Linear Excursion (Xmax): 9 mm
• Half-Space Efficency (Eff): 2.2%

Mounting Information:

• Overall Diameter: 21.73" (552 mm)
• Bolt Circle Diameter: 20.7" (527 mm) 
• Bolt Hole Diameter: 0.25" (6.5 mm) 
• Front Mount Baffle Cut-Out: 20.16" (516 mm)
• Rear Mount Baffle: Cut-Out: 20.16" (516 mm)
• Depth: 9.05" (230 mm)