Network PA System – POE Coaxial Ceiling Speaker (5.25″, 20W, Linux)

Features:
- Brand‑new ABS plastic shell with iron mesh grille, integrating one‑way receiving digital decoding terminal and active ceiling speaker.
- Adopts domestic integrated chips and Linux system, excellent stability, security, portability and flexibility, incomparable to single‑chip solutions.
- CPU: ARM Cortex A7 @ 900MHz.
- Audio Codec: Supports software codec, compatible with G.711, G.726, ADPCM, and audio 3A (AEC/ANR/AGC).
- Standard 1×10/100M RJ45 network communication interface, supporting LAN and WAN deployment.
- Built‑in 1‑channel network hardware audio decoding module for real‑time/timed music playback.
- Sampling rate adjustable in the background; freely select highest sampling rate in LAN for optimal sound quality (WAV 8K/16K/44.1K, AAC 16K/44.1K/48K optional).
- Background hardware resource monitoring: CPU/memory usage ratio and continuous running time.
- Supports remote upgrade of standalone and batch units over LAN/WAN.
- Supports POE IEEE 802.3af (15.4W) protocol.
- Built‑in Class D 20W power amplifier circuit – delicate sound quality, strong power, low distortion.
- 5.25‑inch full‑range speaker unit – full frequency range, clear, bright and pleasant sound quality.
- With POE switch, only one network cable required – simple construction, low cost.
- Power output: 10W (POE) or up to 20W with external DC12V/2A adapter.
- 1‑channel short‑circuit signal input for emergency alarm trigger.
- 1‑channel short‑circuit signal output for linking other devices in emergencies.
- Supports DHCP, compatible with routers, switches, Internet, multicast, unicast, any network topology.
- Built‑in network isolation and lightning protection circuit.

This **Network PA System** ceiling speaker delivers high‑fidelity full‑range sound with convenient POE power and remote management, ideal for flush‑mount ceiling installation in commercial buildings.

Technical Specifications:
- Network Interface: Standard RJ45
- Supported Protocols: HTTP, HTTPS, UDP, TCP/IP, RTP, RTSP, RTMP, MQTT, FTP, SIP
- Audio Formats: mp3, wav
- Sampling Rate: 8K – 48KHz
- Network Transmission Rate: 100Mbps
- Audio Mode: 16‑bit stereo CD‑quality sound
- Power: 10W (POE), 20W (DC12V/2A)
- Speaker Unit: 5.25″×1
- Output Frequency: 100Hz ~ 15KHz
- Harmonic Distortion: ≤1%
- SNR: ≥80dB
- Operating Temperature: -20℃ ~ 70℃
- Humidity: 20% ~ 80% RH
- Power Consumption: 24W
- Input Power: POE / DC12V
- Cutout Size: Φ175mm
- Product Dimensions: 194×131mm
- Installation: Ceiling‑mounted
- Shell Material: Brand‑new ABS
- Weight: 1.25kg

In summary, this **Network PA System** POE coaxial ceiling speaker with Linux‑based decoding, 5.25″ full‑range driver, and flexible power options is the ideal choice for schools, hotels, offices, and commercial spaces requiring discreet, high‑performance IP audio distribution.