40mm Full Range Speaker Unit

These are professional-grade 40mm full-range speaker units rated at 5W RMS and 4 ohm impedance, engineered for accuracy and longevity in compact audio applications. Physical dimensions: 40mm outer diameter, ~22mm depth (including terminals), metal front plate with concentric mounting holes. Sensitivity is measured at 80dB/W/m, and frequency response covers 150Hz–20kHz — verified under standard IEC 60268-5 test conditions. Each unit uses a neodymium-influenced ferrite magnet structure and oxygen-free copper voice coil wire for consistent motor force and thermal resilience. Built for modularity, they suit both sealed and ported enclosures as small as 0.15L, and respond well to passive EQ via simple RC networks. The rubber surround provides predictable suspension linearity, while the metal frame suppresses panel resonance and improves heat dissipation from the motor assembly. Common use cases include replacement drivers in vintage portable radios, rear/surround channels in Dolby Atmos mini-rigs, and primary transducers in USB-C powered desktop speakers. Designed for UK/EU hobbyist supply chains: terminals accept 0.8mm² stranded wire, mounting screws align with M3 hardware, and packaging complies with UKCA labelling requirements for electronic components.