B&C DE991TN – Powerful 86 mm Titanium Compression Driver with Exceptional Midrange Authority
The B&C DE991TN is one of the most distinctive high-frequency compression drivers in the B&C professional audio portfolio. Designed around an exceptionally large 86 mm (3.4-inch) aluminium voice coil, the B&C DE991TN delivers a unique balance of power handling, low-frequency extension, high output capability, and midrange authority that makes it ideal for demanding professional loudspeaker applications.
While many compression drivers focus primarily on extending high-frequency performance, the B&C DE991TN has been engineered to excel in the critical crossover region where compression drivers meet midrange and low-frequency transducers. With a frequency response extending from 800 Hz to 17 kHz, a recommended crossover point of just 1 kHz, and an impressive 100 W AES power handling rating, this driver provides system designers with the flexibility required for premium two-way and three-way loudspeaker systems.
At the heart of the DE991TN is its massive 86 mm titanium diaphragm assembly. This oversized diaphragm allows the driver to reproduce lower frequencies with greater authority than many conventional compression drivers while maintaining excellent efficiency and high-frequency detail. The result is a compression driver capable of producing exceptional vocal clarity, smooth midrange integration, and outstanding projection in both indoor and outdoor sound reinforcement environments.
The B&C DE991TN achieves a sensitivity rating of 108 dB, placing it firmly within the upper tier of professional compression drivers. This high efficiency ensures maximum acoustic output while reducing amplifier demand and increasing overall system headroom. Combined with a powerful 1.94 Tesla neodymium motor structure, the driver delivers exceptional dynamic response and remarkable control across its entire operating range.
For touring sound companies, loudspeaker manufacturers, stadium installers, theatre integrators, and professional system designers seeking a large-format compression driver capable of delivering substantial output with outstanding vocal intelligibility, the B&C DE991TN represents a highly refined solution built to meet the demands of modern professional audio.
B&C DE991TN Design Philosophy
The design of the B&C DE991TN centres around achieving exceptional performance in the most critical region of the audible spectrum.
Human hearing is most sensitive within the vocal range, making accurate reproduction of midrange frequencies essential for speech intelligibility, vocal clarity, and overall system performance. Compression drivers that can comfortably operate lower in frequency often provide smoother integration with low-frequency devices while maintaining superior pattern control through the crossover region.
The DE991TN has been engineered specifically with this goal in mind.
Its large diaphragm assembly and substantial motor structure enable the driver to reproduce frequencies as low as 800 Hz while maintaining excellent control and low distortion. This capability allows designers to implement lower crossover points than would typically be possible with smaller compression drivers.
The result is a more coherent transition between drivers and improved overall loudspeaker performance.
Massive 86 mm Voice Coil Technology
One of the defining characteristics of the B&C DE991TN is its enormous 86 mm (3.4-inch) voice coil.
This is one of the largest voice coils found in B&C’s professional compression driver range and significantly larger than many competing designs.
A larger voice coil offers several key advantages:
- Increased thermal capacity
- Higher power handling capability
- Greater heat dissipation
- Improved long-term reliability
- Enhanced low-frequency control
- Reduced power compression
The DE991TN’s voice coil allows it to handle:
- 100 W AES power
- 200 W continuous program power
without sacrificing clarity or consistency.
The large coil diameter also contributes to the driver’s ability to operate comfortably near its recommended 1 kHz crossover point.
For demanding professional applications where systems may operate at elevated sound pressure levels for extended periods, the thermal advantages of the DE991TN become particularly valuable.
High-Energy 1.94 Tesla Neodymium Motor
The B&C DE991TN utilizes a powerful neodymium motor structure generating 1.94 Tesla of magnetic flux density.
This high magnetic field strength plays a critical role in determining the driver’s efficiency, transient response, and overall performance.
Strong magnetic motors offer numerous benefits:
- Improved voice coil control
- Enhanced efficiency
- Better transient response
- Lower distortion
- Greater dynamic accuracy
- Increased output capability
The 1.94 Tesla motor ensures that the large diaphragm remains tightly controlled even during demanding programme material.
This precise control contributes directly to the DE991TN’s impressive sensitivity rating and exceptional vocal reproduction characteristics.
The neodymium motor also enables a compact and lightweight design compared to traditional ferrite-based alternatives.
Despite its substantial power handling capabilities, the DE991TN weighs only 2 kg, making it suitable for modern line arrays and weight-sensitive touring systems.
Titanium Diaphragm Performance
The B&C DE991TN features a precision-engineered titanium diaphragm, a material widely respected throughout the professional audio industry.
Titanium remains one of the preferred diaphragm materials for high-output compression drivers because it combines:
- High stiffness
- Low mass
- Excellent durability
- Strong transient performance
- Outstanding power handling
The stiffness of titanium allows the diaphragm to remain rigid during operation, reducing unwanted deformation and improving accuracy.
This results in:
- Excellent vocal intelligibility
- Strong projection
- Improved detail retrieval
- Consistent frequency response
- Outstanding dynamic capability
In large venues where sound must travel considerable distances while maintaining clarity, titanium diaphragms often provide advantages over softer diaphragm materials.
The DE991TN uses these characteristics to deliver exceptional performance in applications requiring both high output and precise articulation.
Outstanding Sensitivity and Efficiency
With a sensitivity rating of 108 dB, the B&C DE991TN offers exceptional efficiency.
High sensitivity provides numerous practical advantages in professional sound reinforcement systems.
Benefits include:
- Greater acoustic output
- Increased system headroom
- Reduced amplifier demand
- Improved dynamic performance
- Higher maximum SPL capability
A highly efficient compression driver allows more of the amplifier’s energy to be converted into acoustic output rather than heat.
This contributes to overall system efficiency and can reduce the total amplifier power required to achieve target sound pressure levels.
For large-scale installations and touring systems, these advantages can become significant.
Extended Frequency Response
The B&C DE991TN provides a frequency response spanning 800 Hz to 17 kHz.
This operating range allows the driver to cover a substantial portion of the audible spectrum while maintaining excellent clarity and consistency.
Its recommended crossover frequency of 1 kHz enables:
- Smooth integration with midbass drivers
- Improved pattern control
- Reduced crossover complexity
- Better phase alignment
- Enhanced vocal reproduction
Many professional loudspeaker designers prefer compression drivers capable of operating at lower crossover frequencies because they allow more of the vocal spectrum to be reproduced by a single source.
The DE991TN excels in precisely this role.
Its large diaphragm and powerful motor make it particularly effective in systems where seamless vocal reproduction is a priority.
Extremely Low Inductance
The B&C DE991TN features an exceptionally low inductance of 0.1 mH.
Inductance influences how a driver behaves as frequencies increase.
Lower inductance generally provides:
- Improved high-frequency extension
- More predictable impedance behaviour
- Better crossover integration
- Enhanced transient response
- Greater detail retrieval
At only 0.1 mH, the DE991TN offers excellent electrical performance throughout its operating range.
This low inductance contributes to the driver’s ability to maintain clarity and detail while handling significant power levels.
For loudspeaker designers, lower inductance also simplifies crossover development and improves overall system predictability.
Compact Yet Powerful Installation Solution
Despite its large internal components, the B&C DE991TN remains relatively compact.
Physical specifications include:
- Overall diameter: 115 mm
- Depth: 64 mm
- Net weight: 2 kg
The driver mounts using:
- Four M6 mounting holes
- 102 mm bolt circle
- 90-degree spacing
Its compact footprint allows integration into a wide variety of loudspeaker designs while maintaining compatibility with industry-standard 1.4-inch horn systems.
For touring loudspeakers, line arrays, and installation projects where space efficiency matters, the DE991TN offers an excellent balance between performance and physical size.
Professional Applications for the B&C DE991TN
The B&C DE991TN is particularly well suited to applications requiring substantial output, excellent vocal reproduction, and reliable long-term performance.
Typical applications include:
- Touring loudspeaker systems
- Professional line arrays
- Arena sound reinforcement
- Stadium PA systems
- Festival sound systems
- High-output point source loudspeakers
- Theatre sound reinforcement
- Houses of worship
- Corporate AV systems
- Concert venues
- Nightclubs
- Entertainment facilities
- Premium installed sound systems
Its combination of large diaphragm technology, powerful motor structure, and low crossover capability makes it especially attractive for systems where vocal performance and projection are critical.
Technical Specifications
B&C DE991TN Technical Specifications
Throat Diameter: 36 mm (1.4 in)
Nominal Impedance: 8 Ω
Minimum Impedance: 7.8 Ω
Nominal Power Handling: 100 W
Continuous Power Handling: 200 W
Sensitivity: 108 dB
Frequency Range: 800 Hz – 17 kHz
Recommended Crossover Frequency: 1 kHz
Voice Coil Diameter: 86 mm (3.4 in)
Winding Material: Aluminium
Inductance: 0.1 mH
Flux Density: 1.94 T
Diaphragm Material: Titanium
Mounting Information
B&C DE991TN Mounting Dimensions
Mounting Pattern: Four M6 mounting holes positioned 90° apart on a 102 mm (4 in) bolt circle
Overall Diameter: 115 mm (4.53 in)
Depth: 64 mm (2.52 in)
Net Weight: 2 kg (4.41 lb)
Shipping Weight: 2.04 kg (4.49 lb)
Shipping Box Dimensions: 120 x 120 x 65 mm (4.72 x 4.72 x 2.56 in)
Why Choose the B&C DE991TN?
The B&C DE991TN is a premium large-format compression driver designed for professional audio systems that demand exceptional output, impressive vocal authority, and long-term reliability. Its combination of a massive 86 mm voice coil, 100 W AES power handling, 200 W continuous program power, 108 dB sensitivity, and a powerful 1.94 Tesla neodymium motor places it among the most capable drivers in the B&C compression driver lineup.
Unlike smaller compression drivers that prioritize only high-frequency extension, the DE991TN has been engineered to provide exceptional performance through the critical midrange and lower high-frequency regions. The large titanium diaphragm delivers outstanding vocal projection, while the low 1 kHz crossover capability enables seamless integration into advanced loudspeaker designs.
For manufacturers, system integrators, and professional audio engineers seeking a compression driver capable of combining substantial power handling, high efficiency, and exceptional midrange performance, the B&C DE991TN remains one of the most versatile and impressive solutions available in the B&C professional audio range.
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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.
