B&C DE780TN – Essential 1.4″ Neodymium Compression Driver with 3″ Coil and 220W Power

If you need more power, more sensitivity, and more headroom than a standard 2.5-inch coil compression driver can deliver, the B&C DE780TN steps up with a full 75 mm (3-inch) aluminium voice coil in a package that’s actually smaller and lighter than you’d expect. At just 1.6 kg and 112 mm across, this driver was designed with the sonic character of B&C’s legendary DE900TN — but in a compact format built for tight-spacing line arrays and lightweight cabinet designs.

The B&C DE780TN delivers 108 dB sensitivity and 220 W continuous power handling from a titanium diaphragm, with usable response extending all the way down to 500 Hz. That’s an exceptionally wide bandwidth for a 1.4-inch throat driver, giving you more flexibility in crossover point selection than most compression drivers in this class.

For builders designing high-output two-way PA tops, line array elements, or any cabinet where the compression driver needs to handle serious power without compressing, the B&C DE780TN gives you 3-inch coil performance from a driver that barely takes up more space than a 2.5-inch coil alternative.

Design and Construction of the B&C DE780TN

The B&C DE780TN is built around a 75 mm (3-inch) aluminium voice coil — a significant step up from the DE620TN’s 65 mm coil. That larger coil diameter increases the thermal surface area, which is why the DE780TN handles 220 W continuous compared to the DE620TN’s 160 W. More thermal headroom means less power compression during sustained high-output use.

For your build, that translates to a compression driver that maintains its output and clarity at the end of a long, loud set just as well as it did at the start. If you’ve ever noticed a two-way cabinet sounding duller or less present after hours of use, power compression in the HF driver is usually the culprit — and the DE780TN’s 3-inch coil directly addresses that problem.

The pure titanium diaphragm provides the stiffness and low mass needed for crisp, detailed highs with excellent transient attack. You’ll hear the snap of cymbals, the presence in vocals, and the air in acoustic recordings with the kind of clarity that defines a professional-grade HF section.

The neodymium magnet assembly pushes an impressive 1.95 T flux density at the gap — higher than the DE620TN’s 1.8 T. That extra magnetic force is what drives the 108 dB sensitivity and gives the titanium diaphragm the energy to project across larger spaces with authority.

A shorting copper cap on the magnet assembly reduces voice coil inductance modulation, lowering harmonic distortion and extending the usable bandwidth. The result is smoother, more linear output across the entire frequency range — a detail you’ll appreciate in critical listening applications where every dB of distortion matters.

The ultra-low 0.04 mH inductance confirms the effectiveness of the copper cap — it’s one of the lowest inductance figures in B&C’s compression driver range. Low inductance means the driver responds faster to signal changes and maintains its output further into the upper frequencies without rolling off prematurely.

Performance and Applications for the B&C DE780TN

The B&C DE780TN handles 220 W continuous with 108 dB sensitivity — a combination that gives you exceptional maximum SPL from a compact driver. The 1 dB sensitivity advantage over the DE620TN may sound small on paper, but combined with the 60 W higher power rating, the real-world output ceiling is meaningfully higher.

The frequency response from 500 Hz to 18 kHz is remarkably wide for a 1.4-inch throat driver. That 500 Hz lower limit means you can cross the DE780TN over lower than most competing drivers, giving the woofer in your two-way system less bandwidth to cover. Lower crossover points often result in smoother midrange transitions and better power handling distribution between drivers.

The recommended crossover at 1.2 kHz is the same as the DE620TN, but the DE780TN’s ability to reach down to 500 Hz gives you more room to experiment with crossover topology if your design benefits from a different handoff point.

Available in both 8 Ω and 16 Ω versions, the B&C DE780TN gives you the impedance flexibility needed for line array and multi-driver configurations. The 16 Ω version is particularly useful when wiring multiple drivers in parallel.

Builders commonly choose the B&C DE780TN for:

• High-output two-way PA tops requiring sustained high-SPL performance
• Line array elements where close spacing and light weight are critical
• Stage monitors needing powerful, projecting vocal presence
• Multi-way systems where the compression driver needs wide bandwidth
• Upgrades from 2.5-inch coil drivers where more headroom is needed

The standard 1.4-inch throat and four M6 holes on a 102 mm bolt circle ensure compatibility with the same horns and waveguides that fit the DE620TN. If you’re upgrading from a smaller-coil driver, the DE780TN drops straight in with no hardware changes.

Specifications

• Throat Diameter: 36 mm (1.4 in)
• Voice Coil Diameter: 75 mm (3 in)
• Continuous Power Handling: 220 W
• Nominal Power Handling: 110 W
• Nominal Impedance: 8 Ω
• Minimum Impedance: 8.7 Ω
• Frequency Range: 500 Hz – 18 kHz
• Recommended Crossover: 1.2 kHz
• Sensitivity: 108 dB
• Winding Material: Aluminium
• Inductance: 0.04 mH
• Flux Density: 1.95 T
• Diaphragm Material: Titanium
• Magnet Material: Neodymium with Shorting Copper Cap

Mounting Information

• Bolt Pattern: Four M6 holes, 90° on 102 mm (4 in) diameter
• Overall Diameter: 112 mm (4.41 in)
• Depth: 56 mm (2.2 in)
• Net Weight: 1.6 kg (3.53 lb)
• Replacement Diaphragm: MMD3FTN8M

Conclusion

The B&C DE780TN is the step up for builders who’ve outgrown 2.5-inch coil compression drivers and need more headroom without adding bulk. Its 75 mm voice coil delivers 220 W continuous handling and 108 dB sensitivity from a package that weighs just 1.6 kg and measures only 112 mm across — actually more compact than many competing 2.5-inch coil drivers.

The 1.95 T flux density, ultra-low 0.04 mH inductance, and shorting copper cap give you cleaner, more linear output than the DE620TN, while the 500 Hz lower frequency limit opens up crossover options that smaller drivers can’t offer. Whether you’re building a high-output PA top, a line array element, or upgrading the HF section of an existing cabinet, the B&C DE780TN gives you 3-inch coil performance in a 1.4-inch throat format that drops straight onto your existing horn.

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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.