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RCF LF21X451 - 21" 2000W 8 Ohm
SPL: 95.7dB Fs: 27Hz Xmax: 13.5mm
Product Code: RCFLF21X451 | Brand:

£325.41 ex VAT

2-3 £372.88 ea.4-7 £367.14 ea.8+ £359.49 ea.
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£3.12 DELIVERY to mainland UK

RCF LF21X451 - 21" 2000W 8 Ohm

The LF21X451 low frequency transducer is the result of many years of R&D developments with the goal of creating new levels of professional audio performance standards. This products features advancements and improvements in all the key areas of transducer technology.

Incredibly linear frequency response characteristics, the highest power handling of any comparable transducer, the lowest power compression. The LF21X451 features a fibre loaded cone assembly along with a high excursion triple roll, constant geometry surround: this combination provides remarkable strength and a peak to peak maximum excursion of 54 mm. The new dual forced hyper-venting system guarantees a very efficient voice coil ventilation for minimum power compression and incredible power handling.

The LF21X451 is ideal in applications where combinations of incredible power handling, reasonable weight and ultra fast time response are required.

Perfect for powerful lows in horn loaded sub bass systems or reflex designs. Ideal for touring, also finding perfect application in high power, heavy duty, club subwoofer systems.


  • Nominal Diameter:530 / 21 mm/inch
  • Rated Impedance:8 Ohms
  • Program Power:4000 W AES
  • Power handling capacity:2000 W AES
  • Sensitivity:97 dB
  • Frequency Range:28 Hz - 1000 Hz
  • Effective Piston Diameter:470 mm / 18.5 inch
  • Max Excursion Before Damage (peak to peak):54 mm / 2.12 inch
  • Minimum Impedance:6.7 Ohms
  • Voice Coil Diameter: 115 mm / 4.5 inch
  • Voice Coil Material:Copper
  • Voice Coil Winding Depth:34 mm / 1.33 inch
  • Number of layers:2
  • Kind of layer:inside / outside
  • Top Plate Thickness:15 mm / 0.6 inch
  • Cone Material:No pressed pulp
  • Cone Design:Curved
  • Surround Material:Polycotton
  • Surround Design:Triple roll


  • DC resistance:5.4 Ohms
  • Mechanical factor:6.9
  • Electrical factor:0.39
  • Total factor:0.37
  • BL Factor:30.5 Tm
  • Effective Moving Mass:355 g
  • Equivalent Cas air load:385 litres
  • Effective piston area:0.173 sq m
  • Max. linear excursion (mathematical):13.5 mm
  • Voice - coil inductance @ 1kHz:2.9 mH
  • Half-space efficiency:2.2%


  • Overall Diameter:547 mm / 21.5 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 / 20.1 inch
  • Rear Mount Baffle Cut-out:512 mm / 20.1 inch
  • Depth:230 mm / 9.05 inch
  • Volume occupied by the driver:6.5 litres / 0.229 cu ft
  • Net Weight:15.5 kg / 34.0 lbs
  • Shipping weight:17.59 kg / 26.6 lbs
Other RCF products similar to RCF LF21X451 - 21" 2000W 8 Ohm:
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