Blastking PROFILE21N 21 Inch High-Performance Neodymium Woofer 8 Ohm 4000W Program

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The Blastking PROFILE21N is a 21 inch high-performance neodymium woofer designed for low-frequency professional audio applications. It features 8 ohm impedance, 2000 watts RMS power handling, 4000 watts program power, and 96 dB sensitivity, delivering strong output in a lightweight woofer design.

Built with a 4.9 inch fiberglass voice coil and a lightweight neodymium magnet, the PROFILE21N is specified for a frequency range of 30 Hz to 1000 Hz. Its 21 inch / 530 mm nominal basket diameter, 494 mm cut-out, and 245 mm depth make it a practical option for professional speaker builds and replacement applications where strong low-frequency performance and reduced weight are important.

Features

• 21 inch high-performance neodymium woofer

• Lightweight neodymium magnet

• 8 ohm impedance

• 2000W RMS power handling

• 4000W program power

• 96 dB high sensitivity

• 4.9 inch fiberglass voice coil

• Frequency range: 30 Hz to 1000 Hz

• Low-frequency woofer design

• PROFILE N-SERIES

Specs

• Model: PROFILE21N

• Description: High-Performance Neodymium Woofer

• Nominal Basket Diameter: 530 mm / 21 inch

• Rated Impedance: 8 ohm

• Rated Power Handling: 2000 Watts

• Program Power: 4000 Watts

• Sensitivity: 96 dB

• Frequency Range: 30 Hz - 1000 Hz

• Magnet: 778 g / 27.44 oz

• Magnet Dimensions: 123 x 45 x 10 mm / 4.8 x 1.8 x 0.4 inch

• Minimum Impedance: 5.4 ohm

• Voice Coil Diameter: 125 mm / 4.9 inch

• Voice Coil Material: Fiberglass

• Voice Coil Length: 35 mm / 1.38 inch

• Number of Layers: 2

• Kind of Layers: inside/outside

• Top Plate Thickness: 16 mm / 0.63 inch

• Resonance Frequency (Fs): 23.86 Hz

• DC Resistance (Re): 5.4 ohm

• Mechanical Factor (Qms): 12.89

• Electrical Factor (Qes): 0.413

• Total Factor (Qts): 0.4

• BL Factor (BL): 27.66 T-m

• Effective Moving Mass (Mms): 390.54 gr

• Equivalent Cas Air Load (Vas): 448.98 liters

• Effective Piston Area (Sd): 1.680E-1 m²

• Maximum Linear Excursion (Xmax): 13.5 mm

• Overall Diameter: 552 mm / 21.73 inch

• Bolt Circle Diameter: 519 mm / 20.43 inch

• Bolt Hole Diameter: 8 mm / 0.315 inch

• Front Mount Baffle Cut-Out: 494 mm / 19.45 inch

• Rear Mount Baffle Cut-Out: 494 mm / 19.45 inch

• Depth: 245 mm / 9.65 inch

• Net Weight: 11 kg / 24.2 lbs

• Shipping Weight: 13 kg / 28.66 lbs

• Dimensions (W x D x H): 580 x 575 x 285 mm / 22.8 x 22.6 x 11.2 inch

View PROFILE21N Datasheet