B&C DE640U 1.4″ Professional Polyimide Compression Driver
The B&C DE640U is a high-performance 1.4-inch professional compression driver engineered to deliver exceptional efficiency, reliable power handling, extended high-frequency performance, and outstanding long-term durability in demanding professional sound reinforcement environments. Designed for touring systems, fixed installations, stage monitoring applications, professional point source loudspeakers, line arrays, and high-output PA systems, the B&C DE640U combines advanced polyimide diaphragm technology with a powerful high-flux magnetic structure to achieve excellent acoustic performance across a wide operating bandwidth.
Built to satisfy the requirements of modern professional loudspeaker systems, the B&C DE640U offers an impressive combination of output capability, efficiency, and tonal accuracy. At the heart of the design is a substantial 65 mm (2.5 inch) aluminium voice coil, engineered to provide excellent thermal capacity while maintaining the responsiveness required for accurate high-frequency reproduction.
The driver is optimized for applications requiring both power and precision. With 70 W nominal power handling, 140 W continuous power handling, and a sensitivity rating of 109 dB, the B&C DE640U is capable of delivering substantial acoustic output while maintaining clarity and control throughout its operating range.
A defining feature of the DE640U is its polyimide diaphragm, which offers excellent durability, controlled frequency response characteristics, and dependable long-term performance. Combined with a powerful magnetic assembly generating 1.95 Tesla flux density, the diaphragm delivers exceptional transient response and low distortion, making the driver suitable for both speech and music reproduction.
With a frequency response extending from 1 kHz to 18 kHz and a recommended crossover frequency of 1.2 kHz, the B&C DE640U provides loudspeaker designers with significant flexibility when creating high-performance professional audio systems.
Key Features
- 1.4-inch throat diameter compression driver
- 70 W nominal power handling
- 140 W continuous power handling
- 109 dB sensitivity
- Frequency response from 1 kHz to 18 kHz
- Recommended crossover frequency of 1.2 kHz
- 65 mm (2.5 inch) aluminium voice coil
- Polyimide diaphragm assembly
- High-efficiency 1.95 T magnetic structure
- Low 0.14 mH inductance
- Excellent transient response
- High acoustic output capability
- Professional touring and installation performance
- Compact and lightweight design
- Long-term reliability for demanding applications
Engineered for Professional Sound Reinforcement
The B&C DE640U has been designed to meet the demanding requirements of professional loudspeaker manufacturers, system integrators, and sound reinforcement professionals.
Modern audio systems must provide high sound pressure levels while maintaining speech intelligibility, musical accuracy, and consistent performance over extended operating periods. Compression drivers are central to achieving these goals, particularly in applications where vocal reproduction and high-frequency detail are critical.
The DE640U addresses these requirements through a carefully balanced combination of advanced diaphragm technology, a large-format voice coil, and a high-energy motor assembly. This design enables the driver to deliver substantial acoustic output while preserving the detail and clarity expected in professional sound systems.
Its 36 mm (1.4 inch) throat diameter ensures compatibility with a wide variety of professional horns and waveguides, allowing the driver to be integrated into numerous loudspeaker configurations.
Whether deployed in touring PA systems, installation loudspeakers, houses of worship, theatres, corporate AV environments, or live music venues, the B&C DE640U is engineered to provide dependable performance.
Advanced Polyimide Diaphragm Technology
One of the key distinguishing features of the B&C DE640U is its precision-engineered polyimide diaphragm.
Polyimide is widely used in professional compression drivers due to its excellent combination of durability, thermal stability, and controlled acoustic behaviour. The material offers excellent resistance to fatigue and mechanical stress, making it highly suitable for demanding professional applications.
The diaphragm is designed to maintain consistent performance even when subjected to extended periods of high-output operation. This reliability is particularly valuable in touring systems and permanently installed sound reinforcement systems where uninterrupted performance is essential.
The controlled behaviour of the polyimide diaphragm contributes to smooth frequency response characteristics and accurate reproduction of critical vocal and musical information.
This design approach helps the DE640U achieve a balanced sonic character while preserving the detail and articulation required in professional sound reinforcement environments.
Large 65 mm Voice Coil Assembly
At the centre of the DE640U is a substantial 65 mm (2.5 inch) aluminium voice coil.
Large voice coils offer important advantages in professional compression driver applications. Increased surface area improves heat dissipation and enhances thermal capacity, helping maintain stable operating temperatures during prolonged use.
This robust architecture allows the driver to achieve 70 W nominal power handling and 140 W continuous power handling, providing the reliability required for professional audio systems operating at elevated output levels.
The aluminium winding material reduces moving mass while maintaining excellent electrical conductivity. This combination supports fast transient response and accurate diaphragm control.
As a result, the driver is capable of reproducing dynamic musical content with excellent precision and detail while maintaining consistent performance under demanding conditions.
For professional users, these characteristics contribute to improved reliability and greater confidence during critical applications.
High-Energy 1.95 Tesla Magnetic Circuit
The B&C DE640U utilizes a powerful motor assembly generating 1.95 Tesla flux density.
This high-energy magnetic structure provides exceptional control over diaphragm movement and contributes directly to the driver’s impressive 109 dB sensitivity.
Strong magnetic force allows the diaphragm assembly to respond rapidly to changing audio signals, improving transient accuracy and preserving important musical details.
The powerful motor also assists in reducing distortion by maintaining precise control of diaphragm motion throughout the operating range.
The result is a compression driver capable of producing high output levels while maintaining excellent clarity and definition.
This combination of efficiency and control is a key factor in the professional performance of the DE640U.
Outstanding Sensitivity and Efficiency
With a sensitivity rating of 109 dB, the DE640U is an exceptionally efficient compression driver.
High sensitivity allows greater acoustic output from a given amplifier power level, improving system efficiency and increasing available headroom.
In professional sound reinforcement systems, this efficiency translates into improved dynamic capability and reduced power demands on the amplification system.
The driver’s efficiency makes it particularly well suited for large-scale applications where maximum output and reliable performance are required.
For system designers and engineers, this capability provides greater flexibility when optimizing overall system performance.
Wide Operating Bandwidth
The B&C DE640U is designed to operate across a frequency range of 1 kHz to 18 kHz, providing excellent coverage of the vocal and high-frequency spectrum.
This bandwidth allows the driver to reproduce critical vocal information, speech content, upper harmonics, and fine musical details with impressive clarity.
The combination of the polyimide diaphragm and powerful magnetic assembly contributes to consistent performance throughout the operating range.
Accurate reproduction of high-frequency content is essential for maintaining intelligibility and preserving the natural character of musical material.
The driver’s extended frequency response makes it suitable for a broad range of professional applications, from speech reinforcement to high-quality music reproduction.
Optimized for 1.2 kHz Crossover Operation
The recommended crossover frequency of 1.2 kHz provides valuable flexibility for loudspeaker designers.
Lower crossover frequencies can improve integration between the compression driver and low-frequency transducers, helping create smoother response through the crossover region.
This can also contribute to improved directivity consistency and enhanced overall system coherence.
The combination of the large voice coil, robust diaphragm assembly, and powerful magnetic structure allows the DE640U to operate effectively at this crossover point while maintaining professional reliability.
This flexibility makes the driver suitable for a wide variety of loudspeaker system architectures.
Ideal Applications
The B&C DE640U is suitable for numerous professional audio applications, including:
- Touring PA systems
- Point source loudspeakers
- Professional stage monitors
- Line array systems
- Theatre sound reinforcement
- Houses of worship
- Corporate AV installations
- Entertainment venues
- Live music reinforcement
- Premium installation loudspeakers
- Outdoor event systems
- Multi-way professional loudspeaker systems
Its combination of efficiency, durability, and output capability makes it suitable for both portable and permanent installations.
Compact Professional Design
The DE640U offers substantial performance within a compact and practical form factor.
The driver features an overall diameter of 110 mm (4.33 inches) and a depth of 51 mm (2.01 inches), making integration into loudspeaker enclosures straightforward.
Its relatively compact dimensions allow designers to create efficient enclosure layouts without sacrificing performance.
With a net weight of 1.4 kg (3.09 lb), the driver also supports applications where weight management is important, including portable sound systems and touring equipment.
These characteristics contribute to the overall versatility of the design.
Built for Long-Term Reliability
Reliability remains one of the most important considerations in professional audio equipment design.
The B&C DE640U has been engineered to provide dependable performance through the use of proven materials and precision manufacturing techniques.
The polyimide diaphragm offers excellent resistance to thermal and mechanical stress, while the large voice coil helps manage heat effectively during extended operation.
The powerful magnetic assembly maintains precise diaphragm control even under demanding conditions, helping ensure consistent performance over time.
These design elements work together to deliver the reliability expected from professional B&C components.
For touring companies, installers, and loudspeaker manufacturers, this reliability is an essential advantage.
Technical Specifications
Throat Diameter: 36 mm (1.4 in)
Nominal Impedance: 8 Ω
Minimum Impedance: 7.6 Ω
Nominal Power Handling: 70 W
Continuous Power Handling: 140 W
Sensitivity: 109 dB
Frequency Range: 1 kHz – 18 kHz
Recommended Crossover: 1.2 kHz
Voice Coil Diameter: 65 mm (2.5 in)
Winding Material: Aluminium
Inductance: 0.14 mH
Flux Density: 1.95 T
Diaphragm Material: Polyimide
Design Features
Driver Type: High Frequency Compression Driver
Throat Diameter: 36 mm (1.4 in)
Voice Coil Diameter: 65 mm (2.5 in)
Voice Coil Winding Material: Aluminium
Diaphragm Material: Polyimide
Magnetic Flux Density: 1.95 T
Inductance: 0.14 mH
Recommended Crossover Frequency: 1.2 kHz
Mounting Information
Mounting Configuration: Four M6 holes positioned 90° apart on a 76 mm (3 in) diameter bolt pattern
Overall Diameter: 110 mm (4.33 in)
Depth: 51 mm (2.01 in)
Net Weight: 1.4 kg (3.09 lb)
Applications Summary
The B&C DE640U is a professional-grade 1.4-inch compression driver engineered for applications requiring high efficiency, dependable power handling, smooth frequency response, and long-term reliability. Featuring a 65 mm aluminium voice coil, polyimide diaphragm, powerful 1.95 Tesla magnetic structure, 109 dB sensitivity, 70 W nominal power handling, and 140 W continuous power handling, the driver is ideally suited for touring systems, premium installation loudspeakers, stage monitors, professional point source enclosures, and line array applications.
Its combination of efficient performance, controlled response characteristics, robust construction, and flexible crossover capability makes the B&C DE640U an outstanding choice for professional loudspeaker designers seeking a high-performance 1.4-inch compression driver capable of delivering consistent results in demanding real-world environments.
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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.
