B&C 18NW100 – Powerful 18-Inch Neodymium Subwoofer Driver for High-Efficiency Systems

The B&C 18NW100 is a 98 dB, 2.7% efficiency neodymium 18-inch subwoofer that weighs just 9.05 kg. Those three facts together are the entire pitch — this driver delivers exceptional acoustic output per watt from one of the lightest packages in the professional 18-inch market. When your system design demands maximum sensitivity from minimum weight, the B&C 18NW100 is built to deliver exactly that.

With an FEA-optimised neodymium magnet assembly, a ventilated voice coil gap, and a 1200 W AES power rating backed by 2400 W continuous program power, the B&C 18NW100 combines the efficiency advantages of a light, high-Bl motor with enough thermal capacity to sustain output through extended use. The low Qts of 0.26 and EBP of 115 Hz confirm what the numbers suggest — this driver thrives in vented and horn-loaded enclosures where its efficiency translates directly into real-world output.

B&C recommends a compact 160-litre vented enclosure tuned to 37 Hz, making the B&C 18NW100 a practical choice for builders who want high-output sub cabinets that stay manageable in size and weight.

Design and Construction of the B&C 18NW100

The B&C 18NW100 uses a 100 mm (4-inch) copper voice coil wound on a glass fibre former. The 25 mm winding depth operating in a 12 mm magnetic gap yields 9 mm of linear one-way excursion (Xmax) with an additional 11 mm of travel (Xvar) before mechanical limits. That 20 mm total one-way excursion before damage provides reliable headroom for transient peaks during sustained high-power operation.

The motor is where the B&C 18NW100 separates itself. The FEA-optimised neodymium inside-slug magnet in a T-pole configuration produces 1.2 T of flux density — the highest in B&C’s 100 mm voice coil 18-inch range — and a force factor (Bl) of 28 Tm. That’s a significant step up from the 18NBX100’s 24.8 Tm, and it drives the 211 g moving mass with the kind of authority that produces 98 dB sensitivity and 2.7% reference efficiency. FEA (Finite Element Analysis) optimisation means the magnetic circuit was computationally modelled to maximise flux concentration in the voice coil gap — every gram of neodymium is working as hard as it can.

A ventilated voice coil gap allows air to circulate around the coil during operation, reducing power compression so the B&C 18NW100 maintains its rated output during sustained high-power use. Suspension is handled by a double silicone spider with optimised compliance and a triple-roll surround, providing the controlled excursion behaviour needed for consistent performance.

The radial cone features TWP waterproof treatment on both sides for weather resistance. The 8 Ω nominal impedance is ideal for dual-driver parallel wiring, and a 4 Ω variant is available for single-driver applications.

Performance and Applications for the B&C 18NW100

The B&C 18NW100 delivers 98 dB sensitivity and 2.7% reference efficiency across a 35 Hz – 1000 Hz bandwidth. To put that in context, this driver produces roughly 1.5 dB more output per watt than the 18NBX100 and nearly matches the ferrite 18PZB100’s 97 dB sensitivity — while weighing 3 kg less than either ferrite PZ-series driver. The efficiency advantage is even more pronounced: 2.7% vs the NBX100’s 2% means you’re getting 35% more acoustic output per watt from the same amplifier channel.

The Thiele–Small parameters define a clear design intent. A Qts of 0.26 and an EBP of 115 Hz place the B&C 18NW100 firmly in vented and horn-loaded enclosure territory — this driver does not belong in a sealed box. The low Qts combined with the large Vas of 252 litres means the driver responds well to a relatively compact vented cabinet. B&C recommends 160 litres (5.65 ft³) tuned to 37 Hz — tight enough for a portable touring sub while still delivering meaningful output into the mid-30s Hz range.

Where the B&C 18NW100 excels is in systems where amplifier power is limited or where you want maximum output density from the fewest amplifier channels. Its 98 dB sensitivity means a 1000 W amplifier driving this driver produces roughly the same output as a 1400 W amplifier driving a 96.5 dB driver — that’s a real cost and weight saving on the amplifier side of your system.

Ideal applications for the B&C 18NW100 include:

• Lightweight vented subwoofer cabinets for touring and live sound
• Horn-loaded bass-bin designs where efficiency is the primary design criterion
• Systems running limited amplifier power that need maximum output per watt
• Compact sub designs exploiting the 160-litre recommended enclosure volume
• Dual-driver cabinets using 8 Ω parallel pairs for 4 Ω loading

Specifications – B&C 18NW100

• Nominal Diameter: 460 mm (18 in)
• Nominal Impedance: 8 Ω
• Minimum Impedance: 6.3 Ω
• Nominal Power Handling: 1200 W
• Continuous Power Handling: 2400 W
• Sensitivity: 98 dB
• Frequency Range: 35 Hz – 1000 Hz
• Voice Coil Diameter: 100 mm (4 in)
• Winding Material: Copper
• Former Material: Glass Fibre
• Winding Depth: 25 mm (1 in)
• Magnetic Gap Depth: 12 mm (0.5 in)
• Flux Density: 1.2 T
• Magnet Material: Neodymium (inside slug)
• Cone Shape: Radial
• Cone Treatment: TWP Waterproof (both sides)
• Surround Shape: Triple Roll
• Spider: Double Silicone
• Pole Design: T-Pole
• Net Weight: 9.05 kg (19.95 lb)

Thiele–Small Parameters – B&C 18NW100

• Fs: 31 Hz
• Re: 5.1 Ω
• Qes: 0.27
• Qms: 4.2
• Qts: 0.26
• Vas: 252 dm³ (8.9 ft³)
• Sd: 1210 cm² (187.6 in²)
• η0: 2.7%
• Xmax: 9 mm
• Xvar: 11 mm
• Mms: 211 g
• Bl: 28 Tm
• Le: 1.7 mH
• EBP: 115 Hz

Mounting Information – B&C 18NW100

• Overall Diameter: 460 mm (18 in)
• Bolt Circle Diameter: 440 mm (17.3 in)
• Baffle Cutout Diameter: 422 mm (16.6 in)
• Depth: 209 mm (8.2 in)
• Flange and Gasket Thickness: 16 mm (0.62 in)
• Air Volume Occupied by Driver: 8.5 dm³ (0.3 ft³)
• Recommended Enclosure Volume: 160 dm³ (5.65 ft³)
• Recommended Tuning Frequency: 37 Hz

Conclusion – B&C 18NW100 Subwoofer Driver

The B&C 18NW100 is the highest-sensitivity neodymium 18-inch driver in B&C’s 100 mm voice coil range. At 98 dB and 2.7% efficiency from 9.05 kg, it delivers a performance-to-weight ratio that no ferrite driver can match. The FEA-optimised motor extracts maximum output from the neodymium magnet, and the ventilated gap keeps power compression in check when the driver is working hard.

Where the 18NBX100 offers versatility with its higher Qts, the B&C 18NW100 is more specialised — the low Qts of 0.26 and high EBP of 115 Hz make it the clear pick for vented and horn-loaded designs where efficiency is the primary design goal. The compact 160-litre recommended enclosure means you can build a serious touring sub that’s light, small, and loud — the trifecta that every system designer is chasing.

If you’re building for maximum output per watt per kilogram, the B&C 18NW100 is the 18-inch driver that sets the standard. Pair it with a well-designed vented or horn cabinet, feed it clean power, and let the motor do the work.

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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.