RCF 21" Woofer High-Power Sub-Bass Transducer | LF21X451
RCF 21" Woofer High-Power Sub-Bass Transducer | LF21X451
SoundPro Item: 113794 | Part Number: LF21X451
Usually ships in 5-7 business days
- Dual-Forced Air Ventilation Minimizes Power Compression Under Sustained High-Level Output
- Triple-Roll Polycotton Surround Controls Cone Geometry During High-Excursion Operation
- Dual Silicon Spider System Resists Cone Deformation At Extreme Displacements
- Inside/Outside Copper Voice Coil Winding Improves Heat Distribution And Linearity
- Curved Composite Cone Construction Reinforces Rigidity For Accurate Sub-Bass Reproduction
- Optimized T-Pole Design Reduces Flux Modulation For Lower Distortion
- CE Compliant For Use In International Touring And Installed Sound Applications
The RCF 21" woofer series is engineered for system integrators, cabinet builders, and touring production teams who need a proven transducer platform for high-output subwoofer applications. Both models are built around a 4.5-inch copper voice coil with inside/outside winding, a curved composite cone reinforced with a triple-roll polycotton surround, and a dual spider system with silicon-based damping control. These design choices work together to maintain cone geometry and low distortion under extreme excursion conditions, making both models suitable for demanding live sound deployments where power compression and cone deformation are primary concerns.
The dual-forced air ventilation system is central to the thermal performance of both drivers. By actively channeling air across the voice coil gap, it keeps operating temperatures lower under sustained high-level output, a critical advantage in touring subwoofer stacks or permanently installed systems that run extended shows. The optimized T-pole structure minimizes flux modulation, contributing to the clean, linear low-frequency reproduction these transducers are designed for. With a shared 8-ohm rated impedance, a 21.54-inch overall diameter, and identical baffle cut-out dimensions across the series, both models integrate directly into the same enclosure formats, giving integrators the flexibility to select a driver based on power and sensitivity requirements without redesigning the cabinet.
CE compliance confirms both drivers meet European safety standards, making them viable for internationally touring rigs and installed venues across multiple markets. For engineers and builders who require a high-excursion, low-compression 21-inch woofer with a documented Thiele-Small parameter set and verified mounting geometry, this series provides a consistent and well-documented foundation.
Specifications
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