B&C 18PS100 – Versatile 18-Inch Subwoofer Driver Built for Efficient Bass Reproduction

The B&C 18PS100 in its 8 Ω configuration is B&C’s efficiency-focused 18-inch subwoofer driver for builders who want clean, controlled bass output without the weight or cost of a neodymium long-throw design. With 95.5 dB sensitivity, a featherweight 202 g moving mass, and a ferrite motor that punches above its price class, this driver turns modest amplifier power into real acoustic output.

The 8 Ω impedance variant gives you a key advantage over its 4 Ω sibling — the ability to wire two drivers in parallel to present a 4 Ω load to a single amplifier channel. That makes the B&C 18PS100 a natural choice for dual-driver sub cabinets where you want to double your cone area and displacement without overloading your amp.

At just 10.2 kg per driver, the B&C 18PS100 keeps your cabinet light enough to carry without a crew. For portable PA rigs, DJ subs, and cost-effective DIY builds, this is the kind of driver that earns its place through honest, reliable performance rather than headline specifications.

Design and Construction of the B&C 18PS100

The B&C 18PS100 uses a 100 mm (4-inch) copper voice coil wound on a glass fibre former. The 8 Ω version features a 21 mm winding depth — slightly deeper than the 4 Ω variant’s 19 mm — operating in the same 10.5 mm magnetic gap. That deeper winding yields 8 mm of linear one-way excursion (Xmax) with an additional 8 mm of travel (Xvar) before mechanical limits.

The motor runs a ferrite magnet in a T-pole configuration, producing 1.05 T of flux density and a force factor (Bl) of 22.5 Tm. That Bl figure is notably higher than the 4 Ω version’s 20 Tm, which — combined with the lighter 202 g moving mass — explains the 8 Ω variant’s higher sensitivity and efficiency. The motor has strong control over the cone assembly, delivering tight transient response and well-damped behaviour across the operating range.

Suspension is handled by a double silicone spider with optimised compliance, paired with a triple-roll surround. The radial cone features TWP waterproof treatment on both sides for moisture resistance in outdoor and high-humidity environments.

The physical frame is identical to the 4 Ω version — same 460 mm overall diameter, same 197 mm depth, same 10.2 kg net weight. If you’ve already designed a cabinet around the 4 Ω B&C 18PS100, the 8 Ω version drops straight in with no baffle or cutout changes required.

Performance and Applications for the B&C 18PS100

The B&C 18PS100 (8 Ω) covers a 30 Hz – 1000 Hz frequency range with 95.5 dB sensitivity and 1.6% reference efficiency. That 1.5 dB sensitivity gain over the 4 Ω version is meaningful in practice — you’re getting noticeably more output per watt, which matters when you’re running the driver from a mid-range amplifier rather than a touring-grade powerhouse.

The Thiele–Small parameters are very close to the 4 Ω model. A Qts of 0.39 and an EBP of 73 Hz place the B&C 18PS100 right on the sealed/vented boundary — one of the most flexible alignment zones for an 18-inch sub driver. You can run it sealed for tighter, more controlled bass in a smaller cabinet, or vented for extended low-frequency reach. B&C recommends a 250-litre (8.83 ft³) vented enclosure tuned to 29 Hz for the full vented alignment.

The real advantage of the 8 Ω impedance shows up in multi-driver configurations. Two B&C 18PS100 drivers wired in parallel present a 4 Ω load — a comfortable match for most professional amplifier channels. You double your radiating area and displacement capability while keeping impedance within the amplifier’s optimal operating range. For dual-18 sub cabinets, this is the logical impedance choice.

Ideal applications for the B&C 18PS100 include:

• Dual-driver subwoofer cabinets with parallel wiring to a single amp channel
• Portable PA and DJ subwoofer builds where weight and cost matter
• Sealed or vented enclosure designs for small to mid-sized venues
• Budget-friendly DIY subwoofer projects for live sound reinforcement
• Replacement driver for existing 18-inch cabinets requiring an 8 Ω transducer

Specifications – B&C 18PS100

• Nominal Diameter: 460 mm (18 in)
• Nominal Impedance: 8 Ω
• Minimum Impedance: 6.3 Ω
• Nominal Power Handling: 700 W
• Continuous Power Handling: 1400 W
• Sensitivity: 95.5 dB
• Frequency Range: 30 Hz – 1000 Hz
• Voice Coil Diameter: 100 mm (4 in)
• Winding Material: Copper
• Former Material: Glass Fibre
• Winding Depth: 21 mm (0.83 in)
• Magnetic Gap Depth: 10.5 mm (0.41 in)
• Flux Density: 1.05 T
• Magnet Material: Ferrite
• Cone Shape: Radial
• Cone Treatment: TWP Waterproof (both sides)
• Surround Shape: Triple Roll
• Spider: Double Silicone
• Pole Design: T-Pole
• Net Weight: 10.2 kg (22.49 lb)

Thiele–Small Parameters – B&C 18PS100

• Fs: 30 Hz
• Re: 5.3 Ω
• Qes: 0.41
• Qms: 4.6
• Qts: 0.39
• Vas: 245 dm³ (8.6 ft³)
• Sd: 1210 cm² (187.6 in²)
• η0: 1.6%
• Xmax: 8 mm
• Xvar: 8 mm
• Mms: 202 g
• Bl: 22.5 Tm
• Le: 2.1 mH
• EBP: 73 Hz

Mounting Information – B&C 18PS100

• Overall Diameter: 460 mm (18 in)
• Bolt Circle Diameter: 440 mm (17.3 in)
• Baffle Cutout Diameter: 422 mm (16.6 in)
• Depth: 197 mm (7.75 in)
• Flange and Gasket Thickness: 16 mm (0.62 in)
• Air Volume Occupied by Driver: 9.5 dm³ (0.33 ft³)
• Recommended Enclosure Volume: 250 dm³ (8.83 ft³)
• Recommended Tuning Frequency: 29 Hz

Conclusion – B&C 18PS100 Subwoofer Driver

The B&C 18PS100 in 8 Ω is the smarter pick when you’re designing multi-driver sub cabinets or need the impedance headroom that an 8 Ω load provides. It shares the same proven ferrite platform and lightweight frame as the 4 Ω version, but gains a meaningful edge in sensitivity and efficiency thanks to the lighter moving mass and stronger force factor — 95.5 dB and 1.6% versus 94 dB and 1.46% on the 4 Ω model.

The enclosure flexibility remains a standout feature. With a Qts of 0.39, you’re not locked into a single alignment — sealed, vented, and even bandpass designs are all viable depending on your application. That makes the B&C 18PS100 a genuinely versatile platform for builders who want to experiment or need one driver to serve across different cabinet designs.

For budget-conscious PA builds, dual-18 sub cabinets, and portable rigs where weight and value matter as much as output, the B&C 18PS100 delivers dependable build quality and real-world performance without breaking the bank. It’s the workhorse driver that gets the job done — reliably, efficiently, and without drama.

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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.