Bosch cabinet loudspeaker LBD3905-D
- 12W PA speaker with selectable taps (12W / 6W / 3W)
- Bi-directional sound output for corridors and long spaces
- Clear speech & background music (150 Hz – 15 kHz)
- Wide 254° coverage horizontally and vertically
- 100V line compatible for professional PA systems
- Easy wall-mount installation with rear keyholes
- Quick connection via 4-pole push-in terminals
- Durable Bosch build quality for long-term professional use
- Estimated Delivery : Up to 4 business days
- Free Shipping & Returns : On all orders over $200
The Bosch LBD3905-D is a 12W bi-directional cabinet loudspeaker specially designed for clear announcements and background music in professional public address (PA) systems. With its bi-directional sound output, this speaker delivers audio evenly in two directions, making it ideal for corridors, hallways, passages, platforms, retail spaces, offices, schools, hospitals, and commercial buildings across India. Supporting 100V line PA systems and offering selectable power taps (12W / 6W / 3W), allows flexible sound control based on installation needs. Its wide sound dispersion, high sound pressure level, and clear frequency response (150 Hz – 15 kHz) ensure that announcements are loud, clear, and easy to understand even in long or narrow spaces.
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What is bi-directional sound in this speaker?
A-1 Bi-directional means the speaker projects sound in two opposite directions, ideal for corridors and long spaces.
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What is the maximum power output of Bosch LBD3905-D?
A-2 The speaker supports 12W maximum, with selectable taps of 12W / 6W / 3W.
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Is this speaker suitable for PA systems?
A-3 Yes, it is designed specifically for 100V line public address systems.
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Can it be used for music as well as announcements?
A-4 Yes, it supports clear speech and background music.
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Is installation easy?
A-5 Yes, it includes rear wall-mount keyholes and push-in terminals for easy installation.
Specifications
| Brand | Bosch |
| Model | LBD3905-D |
| Product Type | Bi-Directional Cabinet Loudspeaker |
| Rated Power | 12 W (Selectable taps: 12 W / 6 W / 3 W) |
| Rated Input Voltage | 100 V line |
| Rated Impedance | ~833 Ω |
| Sound Pressure Level (SPL) | ~96 dB @ 12 W / ~90 dB @ 1 W (1 kHz, 1 m) |
| Effective Frequency Range | 150 Hz – 15 kHz |
| Horizontal Coverage (-6 dB) | ~254° @ 1 kHz / ~254° @ 4 kHz |
| Vertical Coverage (-6 dB) | ~254° @ 1 kHz / ~254° @ 4 kHz |
| Connector Type | 4-pole push-in terminals |
| Mounting | Wall mount (keyholes at rear) |
| Dimensions (H × W × D) | 243 × 230 × 131 mm |
| Weight | ~1.9 kg |
| Colour | Black |
| Operating Temperature | -5 °C to +55 °C |
| Storage Temperature | -40 °C to +70 °C |
| Ideal Applications | Offices, schools, hospitals, retail spaces, corridors, PA systems |
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