B&C 10CL64 – Precision 10-Inch Neodymium Woofer with Copper Coil and Enhanced Motor Authority
The B&C 10CL64 is the newest addition to B&C’s ultralight neodymium 10-inch range — a copper-wound, T-pole upgrade over the CLA64 that delivers stronger motor authority, more excursion, and a lower Qts from a driver that still weighs just 2 kg. With 96 dB sensitivity, a 65 Hz – 4000 Hz bandwidth, 16.3 Tm force factor, and 5.2 mm of linear excursion, the B&C 10CL64 bridges the gap between the featherweight CLA64/CL51 and the heavier 3-inch coil specialists — giving builders more motor control and thermal headroom without the weight jump to the 6+ kg class.
The switch from the CLA64’s aluminium coil to a copper winding is the key engineering change. Copper is denser and more thermally conductive than aluminium — it handles heat better under sustained power and provides more consistent electrical performance as the coil temperature rises. The T-pole motor replaces the CLA64’s straight pole, concentrating flux more effectively and producing a 16.3 Tm Bl that’s 12% stronger than the CLA64’s 14.5 Tm.
B&C recommends a 29-litre vented enclosure tuned to 65 Hz. With a Qts of 0.31 and an EBP of 191 Hz, the B&C 10CL64 favours vented and horn-loaded designs more decisively than the CLA64’s higher Qts — producing tighter, more controlled bass response in tuned enclosures. At 2 kg, it adds just 150 g over the CLA64 for meaningfully better motor performance.
Design and Construction of the B&C 10CL64
The B&C 10CL64 uses a 64 mm (2.5-inch) copper voice coil wound on a glass fibre former. The copper winding is a deliberate upgrade from the CLA64’s aluminium — copper is denser and more conductive, which provides better thermal transfer from the coil to the former and reduces resistance drift as coil temperature increases. The 14.3 mm winding depth operating in an 8 mm magnetic gap yields 5.2 mm of linear one-way excursion (Xmax) with an additional 6 mm of travel (Xvar) before mechanical limits — a gain of 0.2 mm on Xmax and a full 1 mm on Xvar compared to the CLA64.
The motor uses a neodymium inside-slug magnet in a T-pole configuration — another upgrade from the CLA64’s straight pole design. The T-pole geometry concentrates flux more efficiently, producing 1.16 T of flux density and a force factor (Bl) of 16.3 Tm. That 16.3 Tm drives the 41.6 g moving mass with noticeably more authority than the CLA64’s 14.5 Tm on 36 g — the B&C 10CL64’s motor has a firmer grip on the cone, which shows up as tighter transient response and the lower Qts of 0.31 versus the CLA64’s 0.42.
The exponential cone profile supports pistonic behaviour into the upper mid-range, enabling the 4000 Hz upper bandwidth that matches the CLA64 and the 10CL51. WP waterproof treatment on the front side provides moisture resistance for outdoor and high-humidity environments.
A single spider handles suspension, paired with a double-roll surround. At 2 kg, 258 mm overall diameter, 112 mm depth, and a 10 mm flange thickness, the B&C 10CL64 is marginally larger and heavier than the CLA64 (1.85 kg, 257 mm, 111 mm, 9 mm flange) — the copper coil and T-pole motor add a small amount of mass and depth. The 232 mm baffle cutout matches the CLA64 exactly, making the two physically interchangeable in existing cabinets.
Performance and Applications for the B&C 10CL64
The B&C 10CL64 delivers 96 dB sensitivity and 1.69% reference efficiency across a 65 Hz – 4000 Hz bandwidth. The sensitivity matches every other 2.5-inch coil 10-inch woofer in B&C’s range (CLA64, CL51, PS26 all at 96 dB), while the 1.69% efficiency edges the CLA64’s 1.65% — a small but measurable gain from the stronger T-pole motor. In practical terms, the B&C 10CL64 produces the same output per watt as the CLA64 with better transient control and more excursion headroom.
The Thiele–Small parameters are where the B&C 10CL64 separates itself from the CLA64. A Qts of 0.31 and an EBP of 191 Hz are meaningfully more motor-dominant than the CLA64’s 0.42 / 164 Hz — the B&C 10CL64 produces tighter, faster bass in vented enclosures and responds better to horn loading. B&C recommends the same 29-litre (1.02 ft³) vented enclosure tuned to 65 Hz as the CLA64, making the CL64 a direct drop-in upgrade for builders who want more motor control from the same cabinet.
The copper coil’s thermal advantage matters in sustained-use applications. As a coil heats up during extended high-power operation, its resistance increases — aluminium coils experience more resistance drift than copper, which means the CLA64’s output characteristics change more over the course of a long set than the B&C 10CL64’s. For builders running their 10-inch woofers hard and consistently, the copper coil maintains more predictable behaviour.
Ideal applications for the B&C 10CL64 include:
- Compact two-way tops and stage monitors requiring tight, controlled bass
- Vented 10-inch cabinets for live sound reinforcement
- Horn-loaded mid-bass applications exploiting the low Qts and high EBP
- Direct upgrades from CLA64 installations needing more motor authority
- Column speakers and multi-driver arrays where 2 kg per driver keeps total weight manageable
Specifications – B&C 10CL64
- Nominal Diameter: 250 mm (10 in)
- Nominal Impedance: 8 Ω
- Minimum Impedance: 6.3 Ω
- Nominal Power Handling: 250 W
- Continuous Power Handling: 500 W
- Sensitivity: 96 dB
- Frequency Range: 65 Hz – 4000 Hz
- Voice Coil Diameter: 64 mm (2.5 in)
- Winding Material: Copper
- Former Material: Glass Fibre
- Winding Depth: 14.3 mm (0.56 in)
- Magnetic Gap Depth: 8 mm (0.31 in)
- Flux Density: 1.16 T
- Magnet Material: Neodymium (inside slug)
- Cone Shape: Exponential
- Cone Treatment: WP Waterproof (front side)
- Surround Shape: Double Roll
- Spider: Single
- Pole Design: T-Pole
- Net Weight: 2 kg (4.41 lb)
Thiele–Small Parameters – B&C 10CL64
- Fs: 63 Hz
- Re: 5.3 Ω
- Qes: 0.33
- Qms: 5.1
- Qts: 0.31
- Vas: 22.2 dm³ (0.78 ft³)
- Sd: 320 cm² (49.6 in²)
- η0: 1.69%
- Xmax: 5.2 mm
- Xvar: 6 mm
- Mms: 41.6 g
- Bl: 16.3 Tm
- Le: 1.17 mH
- EBP: 191 Hz
Mounting Information – B&C 10CL64
- Overall Diameter: 258 mm (10.16 in)
- Bolt Circle Diameter: 245 mm (9.65 in)
- Baffle Cutout Diameter: 232 mm (9.13 in)
- Depth: 112 mm (4.41 in)
- Flange and Gasket Thickness: 10 mm (0.39 in)
- Air Volume Occupied by Driver: 1 dm³ (0.04 ft³)
- Recommended Enclosure Volume: 29 dm³ (1.02 ft³)
- Recommended Tuning Frequency: 65 Hz
Conclusion – B&C 10CL64 Woofer
The B&C 10CL64 is the CLA64 refined for builders who want more motor control without adding significant weight. The copper coil, T-pole motor, and 16.3 Tm force factor deliver tighter transient response and a lower Qts that produces better-defined bass in vented enclosures — all for an additional 150 g over the CLA64’s 1.85 kg. The same 29-litre enclosure and 232 mm baffle cutout mean the B&C 10CL64 drops directly into any CLA64 cabinet as a straight upgrade.
The copper winding’s thermal stability is a practical advantage that doesn’t show up on a sensitivity spec but matters across a long gig. Less resistance drift means more consistent output and impedance behaviour over time — the kind of reliability that professional system designers value even when the datasheet numbers look similar between the two drivers.
For compact two-way tops, stage monitors, horn-loaded mid-bass applications, and any build where a 10-inch neo woofer needs to deliver 96 dB sensitivity with tighter motor control than the CLA64 at barely more weight, the B&C 10CL64 is the newest and most refined 2.5-inch coil 10-inch woofer in B&C’s range. It’s the CL-series evolved — same ultralight philosophy, better motor, copper coil, 2 kg.
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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.
