40mm Full Range Speaker 4 Ohm 5W HiFi Stereo Loudspeaker
40mm Full Range Speaker 4 Ohm 5W HiFi Stereo Loudspeaker
40mm Full Range Internal Magnetic Speaker – 4Ω 5W HiFi Audio
Upgrade your audio projects with this compact yet powerful 40mm full range loudspeaker. Designed for makers, hobbyists, and electronics enthusiasts, this internal magnetic speaker delivers clear, wide-frequency sound in a small form factor — ideal for Bluetooth speakers, walkie-talkies, amplifiers, and custom audio builds.
Key Features
- Full Frequency Range: Covers 0–20kHz for rich, detailed audio reproduction across the entire audible spectrum.
- Internal Magnetic Design: Minimizes external stray magnetic field interference and prevents magnetic leakage — ideal for use near sensitive electronics.
- High Sensitivity: 94dB/W sensitivity ensures loud, clear output even at lower drive voltages.
- Low Internal Resistance: 4Ω impedance for efficient power transfer and compatibility with standard 4Ω amplifiers.
- Durable Construction: Built from quality metal materials and engineered to withstand high-strength, low-temperature cycle testing for lasting performance.
- Versatile Compatibility: Compatible with Bluetooth speakers, walkie-talkies, portable players, and amplifier circuits.
- Compact Size: φ40mm x H20mm — fits neatly into space-constrained enclosures and DIY builds.
Technical Specifications
| Driver Size | 40mm (φ40mm H20mm) |
| Impedance | 4Ω |
| Rated Power | 3W |
| Max Power | 5W |
| Sensitivity | 94dB/W |
| Frequency Range | 0 – 20kHz |
| Drive Voltage | 3.4 – 4.4V |
| Magnetic Circuit | Internal Magnetic Type |
| Type | Pot Bottom Hat Horn |
| Material | Metal |
What's in the Box
- 1 × 40mm Full Range Internal Magnetic Speaker
Made in China.
Please allow 1–2cm measurement deviation due to manual measurement. Colors may vary slightly from product images due to monitor display differences.
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Frequently Asked Questions
Q: What devices is this 40mm speaker compatible with?
A: This full range 40mm speaker is compatible with a wide variety of devices including Bluetooth speakers, walkie-talkies, portable audio players, amplifiers, and custom DIY electronics projects. Any device using a 4Ω speaker with up to 5W power output will work with this driver.
Q: What is the advantage of an internal magnetic speaker design?
A: An internal magnetic design significantly reduces external stray magnetic field emissions, meaning the speaker is less likely to interfere with nearby electronic components. This makes it especially well-suited for compact builds and devices that house multiple electronic parts in close proximity.
Q: What amplifier is recommended for this speaker?
A: This speaker is designed to match a 4Ω, 5W power amplifier. The rated power is 3W, with a maximum of 5W, and a drive voltage range of 3.4–4.4V. Always ensure your amplifier's output matches or stays within these specifications for best performance and longevity.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.