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CLEARANCE RCF LF21N451 21" Neodymium Woofer Speaker

RCF USA
Part #294-895

CLEARANCE RCF LF21N451 21" Neodymium Woofer Speaker

RCF USA
Part #294-895  
Model: LF21N451
RCF's LF21N451 is specially designed to provide powerful and accurate sub-bass frequencies with low distortion and minimal power compression.
Key Features
  • 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
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Overview

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 Details

BrandRCF USA
ModelLF21N451
Part Number294-895
UPC844632090295
Unit of MeasureEach
Weight31.05

Product Specifications

Nominal Diameter21"
Bolt Circle Diameter20.7
Power Handling (RMS)1500 Watts
Power Handling (MAX)3000 Watts
Impedance8Ω
Frequency Response30 to 1,000Hz
Sensitivity98.5dB 2.83V/1m
Voice Coil Diameter4.5"

Thiele-Small Parameters

Resonant Frequency (Fs)30Hz
DC Resistance (Re)5.6Ω
Voice Coil Inductance (Le)3mH
Mechanical Q (Qms)6.1
Electromagnetic Q (Qes)0.27
Total Q (Qts)0.26
Compliance Equivalent Volume (Vas)13.24ft³
BL Product (BL)34.5T·m
Maximum Linear Excursion (Xmax)13.2mm
Surface Area of Cone (Sd)1730cm²

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"
# Mounting Holes8

Parts Express Staff Recommended Enclosure Volume

Sealed Volume1.25ft³
Sealed F3102Hz
Vented Volume2.82ft³
Vented F366Hz

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