FB08CX21 – Factory-Calibrated Passive Crossover for 8-Inch Coaxial Drivers
The FB08CX21 is a high-performance passive crossover designed and manufactured by B&C Speakers for seamless integration with their 8CX21 coaxial loudspeaker. Built for professionals who demand consistency, precision, and reliability, this crossover ensures accurate frequency division and a smooth transition between low and high frequencies—all in a compact, passive format.
Crafted in Italy and optimized to match the acoustic behavior of the 8CX21, the FB08CX21 simplifies speaker system design and guarantees performance without needing DSP, software tuning, or bi-amping. It’s the ideal solution for system integrators, cabinet builders, and OEMs focused on fast deployment and consistent tonal quality.
Optimized for the B&C 8CX21 Coaxial Driver
The FB08CX21 is specifically tuned to pair with the 8CX21 8-inch coaxial transducer. With a recommended crossover frequency of 2 kHz, the network provides a balanced handoff between the woofer and the built-in 1″ compression driver, minimizing phase shift and ensuring uniform dispersion across the frequency range.
Because it’s factory-optimized, the crossover removes the need for trial-and-error design, resulting in faster builds and more reliable sound performance across multiple units. This makes it perfect for building passive monitors, compact full-range cabinets, or fixed-install systems using the 8CX21.
Passive Simplicity, Professional Results
The FB08CX21 enables you to design full-range loudspeakers using a single amplifier channel, thanks to its passive 2-way layout. No need for active crossovers or digital signal processors—this network delivers clean, filtered audio signals directly to the appropriate sections of the coaxial driver.
By maintaining a passive architecture, you simplify your system while still achieving accurate frequency division and phase coherence. This is particularly valuable for mobile PA systems, installation contractors, and loudspeaker manufacturers working with limited amplifier channels or rack space.
Built with Premium-Grade Components
Inside the FB08CX21, B&C uses carefully selected high-tolerance components, including air-core inductors and polypropylene capacitors. These elements ensure low signal loss, minimal distortion, and thermal stability during extended use.
Whether the cabinet is used for touring, rental, or permanent installations, the crossover’s components are rated to maintain performance under demanding conditions, offering long-term reliability and consistent tonal response.
Easy Integration for Cabinet Builders and OEMs
With its compact footprint, the FB08CX21 is designed for internal cabinet mounting. It includes clearly labeled input, LF, and HF output terminals for fast and accurate wiring. Its simple layout reduces installation time and allows for fast scaling in OEM speaker production lines.
Because the crossover has already been tuned and tested by B&C, it guarantees repeatable performance, allowing builders to eliminate crossover design as a production variable. This speeds up prototyping, simplifies quality control, and improves batch consistency.
Specifications
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Type: Passive crossover network
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Designed For: B&C 8CX21 coaxial transducer
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Crossover Frequency: 2 kHz
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Configuration: 2-way (Low-Frequency / High-Frequency)
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Nominal Impedance: 8 ohms
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Input Type: Single amplifier channel
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Output Type: Dual (LF + HF)
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Component Quality: High-grade capacitors and inductors
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Mounting: Internal enclosure mount
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Use Case: Passive PA, monitors, installs
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Made In: Italy
Real-World Applications
Whether you’re building a wedge monitor for live sound, a ceiling speaker for commercial installs, or a compact front-of-house box, the FB08CX21 delivers the accuracy and durability required in professional environments. Its matched design ensures smoother voicing, more articulate midrange, and improved clarity compared to generic crossover solutions.
By streamlining system design and eliminating tuning guesswork, this crossover helps you focus on cabinet design, enclosure acoustics, and deployment—knowing the core signal path is handled with precision.
Conclusion
The FB08CX21 is more than just a passive crossover—it’s a purpose-built performance tool crafted to unlock the full potential of the 8CX21 coaxial driver. With factory tuning, high-end components, and B&C’s renowned engineering behind it, this crossover simplifies design while elevating system performance.
If you’re building loudspeakers that demand tonal consistency, reliability, and passive simplicity, the FB08CX21 is your no-compromise solution—ready to drop in, wire up, and deliver high-fidelity sound right out of the box.
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About B&C Speakers S.r.L.
B&C Speakers products are built in Bagno a Ripoli (Florence), Italy., ensuring high quality products to suite your speaker building requirements. Their 10,500 square meter facility incorporates highly sophisticated automation and quality control. Over the years they become one of the world leaders in the Professional Audio market, a brand recognized everywhere as a premium product that offers excellent value to the consumer.
