6NMB420 6″ Woofer

Description

18 Sound 6NMB420 – Lightweight Neodymium Mid-Bass Driver for High-Performance Audio

The 18 Sound 6NMB420 is a precision-engineered 6.5-inch LF/MF transducer designed to deliver articulate mid-bass performance in professional loudspeaker systems. Developed by 18 Sound in Italy, the 6NMB420 balances high output, excellent voice clarity, and minimal power compression—making it an ideal choice for compact 2-way and 3-way sound reinforcement systems.

With its lightweight neodymium motor, advanced cooling technologies, and premium component design, the 6NMB420 excels in high-efficiency, high-definition applications such as line arrays, stage monitors, and portable PA systems.

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Optimized for Vocal Range Precision

The 6NMB420 is built around a 44 mm (1.7-inch) aluminum edge-wound voice coil on a fiberglass former, delivering fast transient response and wide dynamic range. This design ensures that the driver reproduces the human vocal range with remarkable detail and smooth tonal balance.

Operating across a wide 200 Hz to 6 kHz frequency response, the 6NMB420 seamlessly integrates into midrange sections of two- and three-way systems. Its tonal accuracy and punchy mid-bass presence make it an excellent solution for both speech intelligibility and music applications where midrange clarity is paramount.

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Advanced Motor and Cooling Design

At the heart of the 6NMB420 is an advanced neodymium magnet assembly that provides a strong, consistent magnetic field while keeping the overall driver weight to just 1.25 kg. A key innovation is the integrated aluminum demodulation ring, which reduces inductance variation during high-excursion movement—resulting in significantly lower distortion and more natural sound reproduction.

The voice coil gap features dedicated ventilation channels that work in tandem with a vented pole piece. This reduces thermal build-up and power compression, enabling the 6NMB420 to maintain consistent performance even under demanding continuous-use scenarios.

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High Output with Low Distortion

Engineered for professional environments, the 6NMB420 offers 200W AES power handling and 260W program power, ensuring the headroom needed for high-SPL mid-frequency reinforcement. Its sensitivity of 100 dB (1W/1m) allows for efficient system design with lower amplifier requirements—perfect for portable or powered systems where performance-per-watt is a key metric.

Its low distortion characteristics, combined with exceptional clarity at high output, make it an excellent performer in applications where detail and articulation are non-negotiable.

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Compact and Road-Ready

The compact dimensions and rugged construction of the 6NMB420 make it ideal for tour-grade systems and fixed installations alike. It features a weather protected cone, optimized for moisture resistance and sonic neutrality, and a Triple roll suspension system that provides excellent excursion control without sacrificing transient speed.

The stamped steel basket offers structural stability while minimizing weight. The result is a driver that’s as reliable on the road as it is precise in a critical listening environment.

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Product Specifications

• Model: 18 Sound 6NMB420

• Nominal Diameter: 6.5 inches (152 mm)

• Voice Coil Diameter: 44 mm (1.75 inches)

• Nominal Impedance: 8 Ohms

• AES Power Handling: 200 Watts

• Program Power: 260 Watts

• Frequency Response: 200 Hz – 7,000 Hz

• Sensitivity: 100 dB (1W/1m)

• Magnet Type: Neodymium

• Voice Coil Material: Aluminum

• Cone Material: Treated Paper

• Weight: 1.25 kg

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Conclusion

The 6NMB420 offers an outstanding balance of lightweight design, precision midrange reproduction, and high output capability. Built with 18 Sound’s renowned Italian craftsmanship, this driver is tailored for pro audio engineers and loudspeaker designers who require consistent, clear, and dynamic performance in compact enclosures. With the 6NMB420, achieving world-class vocal articulation and mid-bass punch is simpler than ever.

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VIEW MORE 18 Sound PRODUCTS HERE.

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About 18 Sound

18 Sound products are proudly made in Reggio Emilia, Italy, combining advanced technology with Italian craftsmanship. Known for their high-performance professional audio components, 18 Sound is a trusted name in the global audio industry. Their state-of-the-art manufacturing and strict quality control ensure exceptional reliability and sound clarity. 18 Sound products are designed to meet the demands of speaker builders and audio professionals, 18 Sound offers premium products with outstanding value and performance worldwide.

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