B&C Speakers 8CL51

A 20 cm B&C Designed for Compact and High-Performance Formats

The B&C 8CL51 belongs to the family of professional 20 cm loudspeakers designed to offer an excellent balance between compactness, sensitivity, and definition in the low-midrange. This "8-inch" format is a highly appreciated standard in sound reinforcement because it allows the creation of low-volume speakers while maintaining good attack and clear instrument articulation.

With its neodymium motor and performance-oriented design, this model targets projects where every liter and kilogram count: portable speakers, stage monitors, small full-range heads in multi-way setups, or custom systems for integration.

Who Is It For and What Are Its Uses?

This loudspeaker is aimed at manufacturers, integrators, technicians, and audio DIY enthusiasts seeking a reliable transducer to precisely work the low/midrange area. Its specified bandwidth of 70 Hz to 5000 Hz makes it suitable as a woofer/midbass in a two-way speaker (with a compression driver or tweeter) or as a mid-bass driver in a three-way configuration.

Thanks to its sensitivity and recommended enclosure, the B&C 8CL51 is particularly well-suited for tuned compact speakers capable of delivering a fast and punchy response: snare drum and toms in playback, guitar (in multi-way contexts), vocals with excellent low-midrange articulation, as well as instruments requiring "punch" without heaviness.

Design and Key Points: Sensitivity, Control, and Durability

Neodymium Motor: Power and Mobility

The neodymium magnet keeps the weight low while maintaining a powerful motor. The result is a loudspeaker easier to integrate into portable speakers, stage monitors, or suspended systems, while ensuring good dynamics and a lively response.

51 mm Voice Coil: Power Handling and Stability

The 51 mm (2-inch) copper wire voice coil is sized for sustained use. This design promotes good thermal management and appreciable stability when the system is driven at high levels, especially in the low-midrange where energy is significant.

Double Roll Surround: Greater Excursion Control

The LF double roll surround helps better control the cone movement, an essential factor to limit distortion and maintain clean bass. With a Xmax of 6.5 mm, the 8CL51 comfortably delivers a solid response in the lower spectrum, especially in a properly tuned enclosure.

Exponential Cone and Waterproof Treatment: Reliability in Real Conditions

The exponential cone, combined with a waterproof treatment on the front face, aims for good rigidity and more confident resistance to humidity and operational stresses. In a speaker used for gigs, rehearsals, or installations, this type of finish helps preserve consistent performance over time.

Recommended Enclosure: A Clear Guideline to Optimize the Speaker

B&C specifies a recommended enclosure volume of 17 liters with a tuning at 63 Hz. This guideline provides an effective basis for designing a compact and coherent speaker, aiming for a balance between bass extension and impact. In practice, the chosen tuning and volume strongly influence the sense of depth, low-frequency power handling, and the perceived "speed" of the low end.

Technical specifications

Rackable	No	Type	Speakers
Category	sound reinforcement accessory

Nominal diameter	20 cm (8 inches)	Fs	69 Hz
Power	200 W AES	Qts	0.41
Nominal impedance	8 ohms	Xmax	6.5 mm
Sensitivity	94 dB 1 W/1 m	LF suspension	double roll
Frequency response	70 Hz to 5000 Hz	Cone	exponential, waterproof front treatment
Voice coil	51 mm (2 inches), copper wire	Total diameter	209 mm
Magnet	neodymium	Height	96 mm
Recommended enclosure	17 liters tuned to 63 Hz	Weight	1.25 kg