SILENT PLAYGROUND SERIES:
The Silent Playground Series products by Doctor of Directional Listening and Qingwen Yayin Smart Campus Broadcasting System utilize the company's unique sound field control technology to concentrate sound energy within specified directions and spatial areas. This ensures clear and melodious audio for all types of broadcasts within the school, while instantly reducing external noise to prevent public disturbance.
FEATURES:
Highly directional sound propagation that prevents noise pollution to surrounding areas.
Eco-friendly and efficient sound delivery with exceptional clarity within the main sound field and minimal distortion.
Multi-channel and multi-device synchronization without interference, supported by broadcast-grade system control capabilities.
Weatherproof (rain, mold, sun-resistant) and corrosion-resistant, designed to adapt to varying natural environments.
Simple installation, low maintenance, and easy reconfiguration for flexible adjustments.

Main technical indicators
| Product Model | DAM01 |
| Maximum sound pressure level | 112.9dB @1m 1KHz |
| Directional angle | Horizontal30°>(-20db) |
| frequency range | 125Hz~12.5KHz |
| Audio input interface | XLR Canon |
| Power requirements | 220V,50Hz |
| size | 910mm(L)*280mm(W)*270mm(H) |
| weight | 25Kg |
| Install accessories | Wall-mounted bracket |
| Surface treatment/color | silvery white |
| Protection level | IP66(Rain and dust prevention standards) |
| Operating Temperature | -20℃~70℃ |
| Operating Humidity | 0-93% |
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