B&C 15NA100 – Superior 15-Inch Neodymium Woofer with High-Power 4-Inch Voice Coil

The B&C 15NA100 steps up to a 100 mm voice coil — the largest coil diameter in B&C’s neodymium 15-inch woofer range — and brings everything that comes with it: 800 W AES power handling, 10 mm of linear excursion, and a 26.3 Tm force factor that keeps the 136 g moving mass under firm motor control. Where B&C’s 76 mm and 88 mm coil drivers prioritise sensitivity and minimum weight, the B&C 15NA100 adds serious thermal capacity and displacement capability without abandoning the efficiency and low-distortion performance that neodymium motors make possible.

The feature set reads like B&C’s premium catalogue: FEA-optimised neodymium magnet assembly, aluminium demodulating ring, ventilated voice coil gap, double silicone spider, and T-pole motor geometry. At 8.6 kg, the B&C 15NA100 is heavier than the lightweight neo 15s — but that weight buys you a driver that handles twice the power of the NDL76 and produces 10 mm of clean linear excursion that the 76 mm coil drivers can’t match.

With 98 dB sensitivity across a 45 Hz – 2000 Hz bandwidth and a Qts of 0.28 that favours vented and horn-loaded designs, the B&C 15NA100 is built for applications where the 15-inch woofer needs to handle real power and move real air — not just be loud at low power levels, but stay loud, clean, and controlled when the amplifier is delivering everything it has.

Design and Construction of the B&C 15NA100

The B&C 15NA100 uses a 100 mm (4-inch) aluminium voice coil wound on a glass fibre former. The step from 76 mm or 88 mm to a full 4-inch coil is significant — the larger coil diameter provides more surface area for heat dissipation, which is the primary reason the B&C 15NA100 handles 800 W AES compared to 500–700 W on the smaller-coil neo 15s. The 23 mm winding depth operating in an 11 mm magnetic gap yields 10 mm of linear one-way excursion (Xmax) with an additional 9 mm of travel (Xvar) before mechanical limits.

The motor uses an FEA-optimised neodymium inside-slug magnet in a T-pole configuration, producing 1.2 T of flux density and a force factor (Bl) of 26.3 Tm. FEA (Finite Element Analysis) optimisation means the magnetic circuit was computationally modelled to maximise flux concentration in the voice coil gap — extracting maximum motor performance from every gram of neodymium. The 26.3 Tm Bl is the highest of any neodymium 15-inch woofer in B&C’s range, giving the motor commanding authority over the 136 g moving mass.

An aluminium demodulating ring reduces flux modulation in the voice coil gap, keeping harmonic and intermodulation distortion low as excursion and power increase. A ventilated voice coil gap allows air circulation around the coil, reducing power compression during sustained high-power operation. Suspension is handled by a double silicone spider with optimised compliance and a triple-roll surround.

The exponential cone features WP waterproof treatment on the front side. At 8.6 kg and 180 mm deep, the B&C 15NA100 is the heaviest neodymium 15-inch woofer in B&C’s range — the larger coil and stronger motor assembly account for the added mass. The standard 393 mm overall diameter and 354 mm baffle cutout match B&C’s full-frame 15-inch mounting pattern.

Performance and Applications for the B&C 15NA100

The B&C 15NA100 delivers 98 dB sensitivity and 2.9% reference efficiency across a 45 Hz – 2000 Hz bandwidth. The sensitivity is 1 dB lower than the NDL88 and NDL76, but the trade-off is clear — you gain 10 mm of Xmax (vs 7–8 mm), 800 W of AES power handling (vs 500–700 W), and the strongest force factor in the neo 15-inch range (26.3 Tm vs 20–25.5 Tm). When you need a 15-inch woofer that handles sustained high power and produces clean output at high excursion levels, sensitivity per watt becomes less important than total output capacity — and the B&C 15NA100 has more of that than any other neo 15 in the lineup.

The Thiele–Small parameters define a vented and horn-loaded enclosure driver. A Qts of 0.28 and an EBP of 162 Hz leave no ambiguity about alignment — this driver wants a tuned cabinet. B&C recommends a compact 80-litre (2.82 ft³) vented enclosure tuned to 50 Hz — the smallest recommended enclosure of any 15-inch driver in B&C’s range. That compact volume makes the B&C 15NA100 ideal for tight touring cabinets, two-way tops with limited internal space, and horn-loaded designs where throat volume is constrained.

The combination of 10 mm Xmax and 855 cm² Sd gives the B&C 15NA100 displacement capability that rivals some 18-inch woofers in the lighter-duty ferrite range. For builders designing high-output two-way systems where the 15-inch woofer carries the bass section alone without a dedicated sub, this driver’s excursion and power handling provide the headroom that smaller-coil 15s simply can’t deliver.

Ideal applications for the B&C 15NA100 include:

• High-power two-way tops where the 15-inch handles full bass duties
• Compact vented and horn-loaded cabinets exploiting the 80-litre enclosure recommendation
• Touring speaker systems requiring sustained high-power operation with low distortion
• Line array modules needing more power handling than 76 mm or 88 mm coil drivers provide
• Multi-driver configurations using 8 Ω parallel pairs for 4 Ω loading

Specifications – B&C 15NA100

• Nominal Diameter: 380 mm (15 in)
• Nominal Impedance: 8 Ω
• Minimum Impedance: 6.6 Ω
• Nominal Power Handling: 800 W
• Continuous Power Handling: 1600 W
• Sensitivity: 98 dB
• Frequency Range: 45 Hz – 2000 Hz
• Voice Coil Diameter: 100 mm (4 in)
• Winding Material: Aluminium
• Former Material: Glass Fibre
• Winding Depth: 23 mm (0.9 in)
• Magnetic Gap Depth: 11 mm (0.43 in)
• Flux Density: 1.2 T
• Magnet Material: Neodymium (inside slug)
• Cone Shape: Exponential
• Cone Treatment: WP Waterproof (front side)
• Surround Shape: Triple Roll
• Spider: Double Silicone
• Pole Design: T-Pole
• Net Weight: 8.6 kg (18.96 lb)

Thiele–Small Parameters – B&C 15NA100

• Fs: 47 Hz
• Re: 5.1 Ω
• Qes: 0.29
• Qms: 6.1
• Qts: 0.28
• Vas: 88 dm³ (3.1 ft³)
• Sd: 855 cm² (132.5 in²)
• η0: 2.9%
• Xmax: 10 mm
• Xvar: 9 mm
• Mms: 136 g
• Bl: 26.3 Tm
• Le: 1.2 mH
• EBP: 162 Hz

Mounting Information – B&C 15NA100

• Overall Diameter: 393 mm (15.5 in)
• Bolt Circle Diameter: 374 mm (14.7 in)
• Baffle Cutout Diameter: 354 mm (13.9 in)
• Depth: 180 mm (7.09 in)
• Flange and Gasket Thickness: 16 mm (0.62 in)
• Air Volume Occupied by Driver: 6 dm³ (0.21 ft³)
• Recommended Enclosure Volume: 80 dm³ (2.82 ft³)
• Recommended Tuning Frequency: 50 Hz

Conclusion – B&C 15NA100 Woofer

The B&C 15NA100 is the highest-power, highest-excursion neodymium 15-inch woofer in B&C’s range. The step up to a 4-inch voice coil changes what this driver can do compared to the 76 mm and 88 mm alternatives — 800 W AES, 10 mm of Xmax, and 26.3 Tm of force factor give it thermal headroom, displacement, and motor authority that the lighter-coil drivers can’t match. When the gig demands sustained high power from a 15-inch woofer, the B&C 15NA100 is the neodymium driver that handles it.

The 80-litre recommended enclosure is the most compact of any 15-inch driver in the B&C range, which makes the B&C 15NA100 ideal for space-constrained cabinet designs where internal volume is at a premium. Combined with the FEA-optimised motor, demodulating ring, and ventilated gap, you get a driver that’s been engineered at every level to extract maximum performance from minimum space and weight.

For high-power two-way tops, compact touring cabinets, and any application where a 15-inch woofer needs to deliver the excursion and power handling of a larger format without the size or weight, the B&C 15NA100 is the neodymium 15-inch that closes the capability gap. It’s the 4-inch coil neo woofer that B&C designed for builders who’ve outgrown 76 mm and 88 mm limitations.

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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.