- by Ayushi Agrawal
- 2025-05-08 09:03:04
1511 Speaker Driver for OWS (Open Wearable Stereo) Wireless Earphones
The 1511 speaker driver is specially designed for OWS (Open Wearable Stereo) wireless earphones, also known as air-conduction earphones. Unlike bone-conduction technology, air-conduction earphones transmit sound through the air with open-type designs that position the speaker outlet slightly away from the ear canal.
Why OWS Earphones Need Specialized Speaker Drivers
Due to their open-ear design, OWS earphones require speaker drivers with more power than traditional TWS (True Wireless Stereo) drivers. This is to ensure sufficient sound pressure level (SPL) reaches the ear. As a result, OWS speaker drivers typically feature larger magnets and thicker diaphragms. However, this design results in a higher resonance frequency (FO) compared to TWS earphone drivers.
Power and Resonance Frequency Comparison
| Speaker Driver Type | Rated Power | Resonance Frequency (FO) |
|---|---|---|
| OWS Earphone Speaker Driver | 20–30 mW | 180 Hz |
| TWS Earphone Speaker Driver | 5–10 mW | 100 Hz |
| Headphone Speaker Driver | 20–30 mW | 70–110 Hz |
RB-SPE151101-N08U24: Technical Specifications
The RB-SPE151101-N08U24 is a high-performance OWS speaker driver featuring the following specifications:
- Size: Φ15 × 13.6 mm
- Weight: 7g
- Magnet Material: Nd-Fe-B (Neodymium-Iron-Boron)
- Magnet Size: 9 × 5 × 1.5 mm
- Impedance: 24 ± 15% Ω @ 1kHz, 1V
- Rated Power: 15 mW (Max: 20 mW)
- Resonance Frequency (FO): 200 ± 20% Hz
- SPL (Sound Pressure Level): 121 ± 3 dB
- Frequency Response: 20Hz – 20kHz
- Max Distortion: 20%
- Polarity: Diaphragm moves forward with positive DC at red “+” or marked terminal
Environmental and Reliability Testing
- Operating Temp Range: -20°C to +55°C
- Storage Temp Range: -25°C to +65°C
- White Noise Test: 96 hours @ 0.10W
- Temperature Tests: 96 hours @ +65±3°C / -25±3°C
- Humidity Test: 96 hours @ +40±2°C, 90–95% RH
- Vibration Test: 30 ±15 Hz, 1.5mm amplitude, 2 hours/axis
- Drop Test: 1 meter free fall onto concrete, 11 times
- Temperature Cycling: 5 cycles between 25°C and 65°C
Conclusion
The RB-SPE151101-N08U24 is built to meet the specific needs of OWS wireless earphones, providing high SPL and durability under a wide range of environmental conditions. Its enhanced power handling, resonance characteristics, and reliability testing make it ideal for wearable audio solutions that rely on air-conduction technology for open-ear listening experiences.
