B&C 15BG100 – Superior 15-Inch Neodymium Long-Throw Subwoofer Driver for Deep Bass

The B&C 15BG100 is the most displacement-capable 15-inch driver in B&C’s entire range. With 10.5 mm of linear excursion, 14 mm of Xvar, a 1000 W AES power rating, and a recommended vented tuning of 29 Hz — the deepest of any 15-inch driver B&C makes — the B&C 15BG100 is purpose-built to deliver sub-bass output that most 15-inch drivers can’t reach. This isn’t a woofer repurposed as a sub. It’s a dedicated long-throw subwoofer engineered from the ground up for displacement and deep low-frequency authority.

The step up from the BG76 to the B&C 15BG100 is significant. The 100 mm copper voice coil doubles the power handling (1000 W vs 500 W AES), increases excursion (10.5 mm vs 9.6 mm Xmax), and adds an aluminium demodulating ring that the BG76 doesn’t carry. The heavier 240 g moving mass lowers sensitivity to 94.5 dB, but this driver isn’t about efficiency — it’s about moving as much air as possible from a 15-inch frame while maintaining clean, controlled output at extreme excursion levels.

At 8.8 kg with an FEA-optimised neodymium motor, the B&C 15BG100 remains significantly lighter than ferrite alternatives with comparable displacement. For compact sub systems, distributed bass arrays, and any application where a 15-inch driver needs to do the work of a larger format, this is the neodymium sub that reaches deepest and pushes hardest.

Design and Construction of the B&C 15BG100

The B&C 15BG100 uses a 100 mm (4-inch) copper voice coil wound on a glass fibre former. Copper winding is the right choice for a high-power sub — the superior thermal conductivity manages heat more effectively than aluminium, supporting the 1000 W AES rating during sustained high-power operation. The 27 mm winding depth operating in an 11 mm magnetic gap yields 10.5 mm of linear one-way excursion (Xmax) with a generous 14 mm of additional travel (Xvar) before mechanical limits.

That 24.5 mm total one-way excursion before damage is the highest of any 15-inch driver in B&C’s range. The 27 mm winding depth is also the deepest of any 15-inch driver B&C makes — the deep winding is what creates the long-throw capability, keeping more of the coil inside the magnetic gap throughout the excursion stroke for consistent force output at the extremes of travel.

The motor uses an FEA-optimised neodymium inside-slug magnet in a T-pole configuration, producing 1.25 T of flux density and a force factor (Bl) of 23 Tm. An aluminium demodulating ring reduces flux modulation in the voice coil gap — a critical feature for a sub driver that routinely operates at high excursion levels where flux modulation would otherwise generate significant distortion. A ventilated voice coil gap reduces power compression during sustained use.

The rubber roll surround provides the high compliance and large stroke capability that long-throw sub-bass operation demands. The radial cone is tuned for low-frequency piston behaviour. Suspension is handled by a double silicone spider with optimised compliance. TWP waterproof treatment on both sides provides full weather resistance. At 8.8 kg with a 24 mm flange thickness — the thickest of any 15-inch driver in B&C’s range — the B&C 15BG100 accommodates the deeper motor assembly required for the long-throw coil geometry.

Performance and Applications for the B&C 15BG100

The B&C 15BG100 delivers 94.5 dB sensitivity and 0.8% reference efficiency across a 35 Hz – 1000 Hz bandwidth. Those numbers confirm the driver’s priorities without apology — every design decision trades efficiency for displacement and deep low-frequency output. The 240 g moving mass is the heaviest in B&C’s neo 15-inch range, and it’s the reason the driver produces controlled, authoritative bass in the sub-40 Hz region where lighter-cone woofers are physically unable to generate meaningful output.

The Thiele–Small parameters define a driver with the most versatile sub-bass alignment options in B&C’s 15-inch range. A Qts of 0.44 and an EBP of 73 Hz place the B&C 15BG100 right on the sealed/vented boundary — the same flexible zone that makes the ferrite PS100 family popular with builders. You can run it sealed for tight, well-damped bass in a compact box, or vented for extended sub-bass reach. B&C recommends a 160-litre (5.65 ft³) vented enclosure tuned to 29 Hz — a tuning frequency that places the driver’s output firmly in infrasub territory.

Compared to the BG76, the B&C 15BG100 doubles the power handling (1000 W vs 500 W AES), adds the demodulating ring, gains 0.9 mm of Xmax (10.5 vs 9.6 mm), and significantly increases Xvar headroom (14 vs 12.5 mm). The trade-off is weight (8.8 kg vs 5.95 kg) and sensitivity (94.5 vs 93.4 dB). For builders who found the BG76 short on power handling or wanted cleaner output at high excursion through the demod ring, the B&C 15BG100 fills that gap conclusively.

Ideal applications for the B&C 15BG100 include:

• High-power compact subwoofer cabinets for touring and live sound
• Sealed sub enclosures where the high Qts delivers naturally flat bass response
• Vented designs tuned to 29 Hz or lower for genuine infrasub output
• Distributed bass arrays using multiple compact 15-inch sub cabinets
• Applications requiring maximum displacement from a 15-inch neodymium platform

Specifications – B&C 15BG100

• Nominal Diameter: 380 mm (15 in)
• Nominal Impedance: 8 Ω
• Minimum Impedance: 6 Ω
• Nominal Power Handling: 1000 W
• Continuous Power Handling: 2000 W
• Sensitivity: 94.5 dB
• Frequency Range: 35 Hz – 1000 Hz
• Voice Coil Diameter: 100 mm (4 in)
• Winding Material: Copper
• Former Material: Glass Fibre
• Winding Depth: 27 mm (1.05 in)
• Magnetic Gap Depth: 11 mm (0.43 in)
• Flux Density: 1.25 T
• Magnet Material: Neodymium (inside slug)
• Cone Shape: Radial
• Cone Treatment: TWP Waterproof (both sides)
• Surround Shape: Roll
• Spider: Double Silicone
• Pole Design: T-Pole
• Net Weight: 8.8 kg (19.4 lb)

Thiele–Small Parameters – B&C 15BG100

• Fs: 36 Hz
• Re: 5.1 Ω
• Qes: 0.49
• Qms: 5
• Qts: 0.44
• Vas: 83 dm³ (2.93 ft³)
• Sd: 855 cm² (132.5 in²)
• η0: 0.8%
• Xmax: 10.5 mm
• Xvar: 14 mm
• Mms: 240 g
• Bl: 23 Tm
• Le: 1.6 mH
• EBP: 73 Hz

Mounting Information – B&C 15BG100

• Overall Diameter: 393 mm (15.5 in)
• Bolt Circle Diameter: 374 mm (14.7 in)
• Baffle Cutout Diameter: 354 mm (13.9 in)
• Depth: 189 mm (7.44 in)
• Flange and Gasket Thickness: 24 mm (0.94 in)
• Air Volume Occupied by Driver: 6 dm³ (0.21 ft³)
• Recommended Enclosure Volume: 160 dm³ (5.65 ft³)
• Recommended Tuning Frequency: 29 Hz

Conclusion – B&C 15BG100 Subwoofer Driver

The B&C 15BG100 is the most displacement-capable 15-inch driver B&C makes. The 10.5 mm Xmax, 14 mm Xvar, 27 mm winding depth, and 29 Hz recommended tuning are all range-topping figures that no other 15-inch driver in B&C’s lineup can match. Every design parameter — the heavy 240 g moving mass, the rubber roll surround, the deep copper winding, the high-compliance suspension — is optimised for one thing: moving the maximum amount of air at the lowest possible frequencies from a 15-inch frame.

The demodulating ring and 1000 W AES power handling are what elevate the B&C 15BG100 over the BG76 for serious sub builds. You get twice the power capacity, cleaner output at extreme excursion, and the 4-inch copper coil’s thermal mass to sustain that output through extended use. The Qts of 0.44 gives you the sealed/vented flexibility that the lower-Qts woofer-class drivers can’t offer — a 60–80 litre sealed box delivers clean, extended bass, while the full 160-litre vented alignment reaches into genuine infrasub territory at 29 Hz.

For compact high-power subs, distributed bass arrays, and any build where a 15-inch driver needs to deliver the deepest, hardest-hitting bass the format is capable of, the B&C 15BG100 is the neodymium 15-inch sub that sets the displacement benchmark. It’s B&C’s ultimate neo 15-inch subwoofer — built to reach where no other 15 in the range can go.

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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.