B&C DE900TN – Maximum-Flux 1.4-Inch Neodymium Titanium Compression Driver with 2.05 Tesla Motor
The B&C DE900TN brings the most powerful magnetic circuit in B&C’s product catalogue — 2.05 T — to the 1.4-inch exit format. With 108.5 dB sensitivity, 110 W AES / 220 W program power handling, a 75 mm voice coil, pure titanium diaphragm, and a neodymium motor with shorting copper cap, the B&C DE900TN is the highest-sensitivity 1.4-inch compression driver B&C makes. No other 1.4-inch driver in the range achieves 108.5 dB — the B&C DE900TN stands alone at the top by half a decibel.
The 2.05 T flux density is the specification that defines this driver. It matches the DE910 and DE910TN as the absolute highest of any driver in B&C’s entire product catalogue — LF or HF, any size, any format. The B&C DE900TN is effectively the DE910TN’s motor and diaphragm assembly repackaged with a 1.4-inch exit throat, and the shared replacement diaphragm (MMD3BTN8M) between the two drivers confirms it. Same coil, same dome, same motor strength — different exit size.
The move from the DE910TN’s 1.3-inch exit to the B&C DE900TN’s 1.4-inch changes the acoustic coupling to the horn. The larger exit reduces throat compression, improves linearity at high output levels, and pairs with the larger 1.4-inch professional horns that provide wider coverage patterns and lower cutoff frequencies. For system designers who need the DE910TN’s motor authority on a 1.4-inch horn, the B&C DE900TN is that driver.
At 2.55 kg, 131 mm overall diameter, and 65 mm depth, the B&C DE900TN sits between the compact DE880TN (2.15 kg, 124 mm) and the larger DE610/DE618TN (3.8 kg, 156 mm) on size and weight. Available in 8 Ω with a user-replaceable titanium diaphragm (part number MMD3BTN8M).
Design and Construction of the B&C DE900TN
The B&C DE900TN uses a 75 mm (3-inch) aluminium voice coil driving a pure titanium diaphragm through a 1.4-inch (36 mm) exit throat. The diaphragm assembly is shared with the DE910TN — same coil, same titanium dome, same part number (MMD3BTN8M). This parts commonality confirms that the B&C DE900TN and DE910TN differ only in exit format and body design, not in the core transducer that generates the sound.
The magnetic circuit produces 2.05 T of flux density from a neodymium magnet assembly with a shorting copper cap. This is the same motor strength as the DE910 and DE910TN — the absolute highest in B&C’s product catalogue. The 75 mm voice coil operates in this extreme magnetic field with more total conductor length in the gap than any 65 mm or smaller coil can provide, generating the force that produces 108.5 dB sensitivity and sustains 110 W AES power handling.
The 108.5 dB sensitivity is 0.5 dB higher than the DE800, DE880TN, DE602, DE610, and DE618TN — all at 108 dB. That half-decibel advantage comes directly from the stronger motor. The 2.05 T flux generates more force per ampere than the 1.85 T motors in the DE800/DE880TN or the 1.75 T in the DE610, producing marginally more acoustic output per watt of input. Across a full system — especially multi-element line arrays — the 0.5 dB advantage compounds meaningfully.
The pure titanium diaphragm delivers the bright, forward, detailed treble character that defines professional titanium compression drivers. This is a conventional titanium dome — not the redesigned geometry found on the DE880TN and DE618TN. The dome breakup behaviour and upper treble resonant peak are standard titanium characteristics, providing maximum high-frequency projection and presence for live sound environments where cut-through matters more than upper treble smoothness.
The shorting copper cap reduces voice coil inductance rise at higher frequencies. The 0.14 mH inductance with the cap is the same as the DE800, keeping the impedance curve flat through the 18 kHz upper limit. The cap ensures the high-frequency rolloff is controlled and predictable rather than abrupt.
The 1.4-inch exit throat adds depth compared to the DE910TN’s 1.3-inch exit. The B&C DE900TN is 65 mm deep versus the DE910TN’s 52 mm — 13 mm of additional depth that accommodates the longer acoustic path from diaphragm to the larger exit. The 131 mm overall diameter matches the DE910TN exactly, and the four M6 mounting holes on a 102 mm bolt circle match the standard professional 1.4-inch pattern.
At 2.55 kg, the B&C DE900TN is 150 g heavier than the DE910TN (2.4 kg) and 400 g heavier than the DE880TN (2.15 kg). The additional mass comes from the 1.4-inch exit adapter and the slightly deeper body required for the larger throat.
Performance and Applications for the B&C DE900TN
The B&C DE900TN delivers 108.5 dB sensitivity across a 1 kHz – 18 kHz bandwidth with a recommended crossover frequency of 1.2 kHz. The 108.5 dB is the highest sensitivity of any 1.4-inch compression driver in B&C’s range — 0.5 dB above every other 1.4-inch driver. In a line array with 12 elements, that 0.5 dB per element adds up to a measurable system-level output advantage before any amplifier gain adjustment.
The 1 kHz – 18 kHz bandwidth is identical to the DE800 and standard across B&C’s premium 1.4-inch range. The features list indicates response down to 500 Hz, matching the DE910TN’s extended low-frequency capability at the wider measurement points. For builders crossing over at 1.2 kHz, the B&C DE900TN provides adequate overlap with the woofer section for smooth transitions.
The 110 W AES / 220 W program power handling ties the DE800, DE880TN, and DE910TN as the highest in B&C’s HF range. The 2.05 T motor provides the strongest resistance to power compression of any 1.4-inch driver — as the voice coil heats up and resistance increases, the extreme flux density maintains more force per ampere than weaker motors, keeping the output closer to rated sensitivity for longer.
The choice between the B&C DE900TN and the DE880TN is the most important comparison in B&C’s 1.4-inch range, because both drivers target the same premium tier of professional systems.
The DE880TN wins on weight (2.15 vs 2.55 kg), bandwidth (0.5 vs 1 kHz lower limit), inductance (0.1 vs 0.14 mH), depth (54 vs 65 mm), distortion above 10 kHz (redesigned diaphragm vs conventional), and 16 Ω availability. It’s the lighter, more compact, wider-bandwidth, lower-distortion choice with more impedance flexibility.
The B&C DE900TN wins on flux density (2.05 vs 1.85 T), sensitivity (108.5 vs 108 dB), and resistance to power compression under sustained load. It’s the maximum-motor-authority choice for applications where the strongest possible magnetic circuit and the highest sensitivity per watt are the non-negotiable priorities.
For systems with DSP that can manage titanium’s upper treble resonance, the B&C DE900TN’s conventional titanium diaphragm is not a disadvantage — the DSP handles the correction, and the 2.05 T motor delivers more output. For systems without DSP, the DE880TN’s redesigned diaphragm provides a smoother starting point that requires less processing.
The parts commonality with the DE910TN is a logistical advantage. Builders and rental companies stocking both 1.3-inch and 1.4-inch systems need only one spare diaphragm part number (MMD3BTN8M) to service both the DE910TN and the B&C DE900TN. That inventory simplification reduces costs and ensures critical spare parts are always available.
Ideal applications for the B&C DE900TN include:
- Flagship touring speaker systems requiring maximum sensitivity from a 1.4-inch exit
- Line arrays where the 0.5 dB sensitivity advantage compounds across multiple elements
- High-SPL installations where the 2.05 T motor provides the strongest resistance to power compression
- Active systems with DSP where titanium’s resonant peak can be managed electronically
- Three-way systems pairing with the DE910TN for shared diaphragm inventory across exit sizes
- Arena and festival installations where sustained maximum output defines the HF section’s role
- Applications where maximum motor authority matters more than minimum weight or widest bandwidth
- Systems upgrading from DE800 installations needing higher sensitivity and stronger motor performance
Specifications – B&C DE900TN
- Throat Diameter: 36 mm (1.4 in)
- Nominal Impedance: 8 Ω
- Minimum Impedance: 7.8 Ω
- Nominal Power Handling: 110 W
- Continuous Power Handling: 220 W
- Sensitivity: 108.5 dB
- Frequency Range: 1 kHz – 18 kHz
- Recommended Crossover: 1.2 kHz
- Voice Coil Diameter: 75 mm (3 in)
- Winding Material: Aluminium
- Inductance: 0.14 mH
- Flux Density: 2.05 T
- Magnet Material: Neodymium
- Diaphragm Material: Titanium
- Replacement Diaphragm: MMD3BTN8M
- Net Weight: 2.55 kg (5.62 lb)
Mounting Information – B&C DE900TN
- Overall Diameter: 131 mm (5.2 in)
- Depth: 65 mm (2.6 in)
- Bolt Pattern: Four M6 holes on 102 mm (4 in) bolt circle, 90° apart
Conclusion – B&C DE900TN Compression Driver
The B&C DE900TN is the highest-sensitivity 1.4-inch compression driver in B&C’s range. The 2.05 T neodymium motor — the absolute highest flux density in B&C’s product catalogue — drives the same 75 mm coil and titanium diaphragm assembly as the DE910TN through a 1.4-inch exit, producing 108.5 dB sensitivity that no other 1.4-inch driver can match.
The positioning against the DE880TN is clear. The DE880TN is the lighter, lower-distortion, wider-bandwidth choice with its redesigned diaphragm and 16 Ω option. The B&C DE900TN is the maximum-flux, maximum-sensitivity, maximum-motor-authority choice with the strongest resistance to power compression under sustained load. Both handle 110 W AES. Both cross over at 1.2 kHz. Both use 75 mm coils. The decision comes down to whether you prioritise the DE880TN’s refinements or the B&C DE900TN’s raw motor strength.
For flagship touring systems, arena installations, and any application where a 1.4-inch titanium compression driver needs to deliver the absolute highest sensitivity and the strongest motor authority available from a 75 mm coil platform, the B&C DE900TN is the 1.4-inch that puts 2.05 Tesla behind every watt. The strongest motor in B&C’s catalogue, the highest sensitivity in the 1.4-inch range, and the same proven diaphragm as the DE910TN — maximum output, maximum authority, no compromise.
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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.
