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RCF LF21N451 21" Neodymium Woofer Speaker

Brand:|Model: LF21N451|Part # 294-895


RCF's LF21N451 is specially designed to provide powerful and accurate sub-bass frequencies with low distortion and minimal power compression.
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Part # 294-895
Highlights
  • Designed for concert systems
  • 4.5" diameter inside/outside copper voice coil
  • 3,000 watt continuous program power handling
  • Dual forced-air ventilation for minimum power compression
  • Double spider incorporates silicon damping
  • 13.2 mm Xmax, 58 mm peak-to-peak Xmech
  • BL of 34.5 T/m provides faster and more accurate low frequency response




Product Details

RCF LF21N451 21" Neodymium Woofer Speaker

RCF's LF21N451 is specially designed to provide powerful and accurate sub-bass frequencies with low distortion and minimal power compression. Its voice coil length was engineered to improve excursion and linearity at very low frequencies. The LF21N451 uses a unique RCF-developed carbon fiber/nylon/cellulose composite pulp that reinforces and improves the cone structure's rigidity. This new cone structure and the large triple roll surround/double silicon spider system ensure excellent control and make the cone resistant to deformation caused by very large displacements and pressure created by the transducer’s high excursion behavior. A fully optimized T-pole design generates the minimum amount of flux modulation in the magnetic gap. The LF21N451 excels in applications where light weight and high power handling are required.



Product Specifications
  • Nominal Diameter21"
  • Power Handling (RMS)1,500 Watts
  • Power Handling (max)3000 Watts
  • Impedance8 ohms
  • Frequency Response30 to 1,000 Hz
  • Sensitivity98.5 dB 2.83V/1m
  • Voice Coil Diameter4.5"
Thiele-Small Parameters
  • Resonant Frequency (Fs)30 Hz
  • DC Resistance (Re)5.6 ohms
  • Voice Coil Inductance (Le)3 mH
  • Mechanical Q (Qms)6.1
  • Electromagnetic Q (Qes)0.27
  • Total Q (Qts)0.26
  • Compliance Equivalent Volume (Vas)13.24 ft.³
  • BL Product (BL)34.5 Tm
  • Diaphragm Mass Inc. Airload (Mms)315g
  • Maximum Linear Excursion (Xmax)13.2 mm
  • Surface Area of Cone (Sd)1730 cm²
Materials of Construction
  • Cone MaterialPaper / Carbon Fiber
  • Surround MaterialCloth
  • Voice Coil Wire MaterialCopper
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter21.5"
  • Baffle Cutout Diameter20.1"
  • Depth9.5"
  • Bolt Circle Diameter20.7"
  • # Mounting Holes8
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume1.25 ft.³
  • Sealed F3102 Hz
  • Vented Volume2.82 ft.³
  • Vented F366 Hz
RCF LF21N451 21" Neodymium Woofer Speaker
  • BrandRCF USA
  • ModelLF21N451
  • Part Number294-895
  • UPC844632090295
  • Product CategorySubwoofer Drivers
  • Unit of MeasureEA
  • Product Rating
    (1 Reviews)
  • Weight31.05 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

View similar products to the RCF LF21N451 21" Neodymium Woofer Speaker
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RCF LF21N451 21" Neodymium Woofer Speaker

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RCF LF21N451 21" Neodymium Woofer Speaker

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