40mm Full Range Speaker Driver 4Ω 5W HiFi Loudspeaker Unit
40mm Full Range Speaker Driver 4Ω 5W HiFi Loudspeaker Unit
40mm Full Range Internal Magnetic Speaker Driver – 4Ω / 5W
Upgrade your DIY audio projects with this compact 40mm full-range speaker driver. Featuring an internal magnetic circuit design, this square loudspeaker unit delivers clear, wide-frequency audio reproduction across the full 0–20kHz range — making it an ideal component for walkie-talkies, Bluetooth speaker builds, intercoms, and custom audio enclosures.
Key Features
- Full-Range Audio: Reproduces frequencies from 0 to 20kHz for crisp, detailed sound across the entire audible spectrum.
- Internal Magnetic Design: Minimal external magnetic field leakage, reducing interference with nearby electronics.
- High Sensitivity: 94dB/W sensitivity ensures efficient, clear output even at lower drive voltages.
- Low Internal Resistance: 4Ω impedance pairs seamlessly with standard power amplifier modules (rated 3W, max 5W).
- Durable Construction: Built to withstand high-strength, low-temperature cycle testing for long-lasting reliability.
- Versatile Application: Suitable for walkie-talkies, Bluetooth speakers, intercoms, DIY audio enclosures, and more.
- Compact Form Factor: φ40mm diameter × 20mm height — fits easily into tight enclosures and project builds.
Technical Specifications
| Product Name | Square 40mm Internal Magnetic Speaker |
| Magnetic Circuit | Internal Magnetic Type |
| Drive Voltage | 3.4V – 4.4V |
| Rated Power | 3W |
| Max Power | 5W |
| Impedance | 4Ω |
| Sensitivity | 94dB/W |
| Frequency Range | 0 – 20kHz |
| Dimensions | φ40mm × H20mm |
| Package Includes | 1 × Speaker Driver Unit |
| Country of Origin | Made in China |
Perfect For DIY Audio Builders
Whether you're replacing a driver in an existing enclosure or building a brand-new speaker project from scratch, this 40mm full-range unit offers a reliable, low-distortion foundation. Its compact size and wide frequency response make it a go-to choice for makers, hobbyists, and electronics enthusiasts alike.
Looking for more tools and gadgets for your projects? Check out our Electromagnetic Induction Tester – Coil & Circuit Fault Detector and the Air Compressor Pressure Gauge – DIY Tool for your electronics and DIY toolkit.
Note: Please allow 1–2cm of measuring deviation due to manual measurement. Colors may vary slightly depending on your monitor's display settings.
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Frequently Asked Questions
Q: What is the impedance and power rating of this 40mm speaker driver?
A: This full-range speaker driver has a 4Ω impedance, a rated power of 3W, and a maximum power handling of 5W. It is designed to pair with standard 4Ω power amplifier modules commonly used in walkie-talkies and Bluetooth speaker builds.
Q: What devices is this 40mm internal magnetic speaker compatible with?
A: This speaker driver is compatible with a wide range of audio devices including walkie-talkies, DIY Bluetooth speakers, intercoms, portable radios, and custom audio enclosures. Its compact 40mm × 20mm form factor makes it ideal for tight-space builds and replacement projects.
Q: Does the internal magnetic design reduce interference with other components?
A: Yes. The internal magnetic circuit design significantly minimises external magnetic field leakage, reducing electromagnetic interference with surrounding components — making it a safer, more reliable choice for compact multi-component electronic builds.