Description
Cut through noise and weather with the Grandstream GSC3518HS – a rugged, outdoor SIP/multicast talk-back horn speaker designed for demanding environments where clear, far-reaching communication is critical. Its massive 50W high-fidelity speaker delivers up to 126 dBA of crystal-clear HD audio, while IP66-rated protection and a durable stainless steel bracket keep it running reliably in rain, dust, wind, or extreme conditions.
This isn't for quiet conference rooms; it's built for school athletic fields, hospital loading zones, industrial yards, public parks, sprawling campuses, and warehouses where ambient noise drowns out standard speakers. With three built-in mics offering 8-meter pickup, AI-powered background noise reduction, and full-duplex talk-back, staff or visitors can respond clearly without shouting. Seamless SIP integration means it drops right into your existing PBX for zoned paging, emergency alerts, or two-way intercom – all while supporting multicast for instant group broadcasts.
Pros
- True outdoor beast: IP66 + stainless steel bracket handles harsh sun, rain, and dust with no issues
- Ear-piercing 126 dBA volume with HD codecs (Opus/G.722) for distortion-free reach
- Smart talk-back: 3 mics + AI noise cut + intelligent TTS for usable two-way in tough conditions
- Flexible power & connectivity: PoE++ input, PoE+ passthrough, LINE IN/OUT for external audio
- Broad protocol support: SIP paging, multicast, priority override, AirPlay/RTSP streaming
Cons
- Power hungry – PoE++ (802.3bt) is basically required for full 50W performance; regular PoE limits output
- Strictly wired (no built-in Wi-Fi/Bluetooth) – prioritizes rock-solid reliability over wireless convenience
- Higher investment than indoor models, but worth it for the durability and power
Bottom line: If your site has open space, background roar, or exposure to the elements, skip the indoor speakers and go straight to the GSC3518HS. We've had zero failures in similar installs, and the coverage blows away anything in the 15-30W range.
Grandstream GSC3518HS Key Features
- 50W high-fidelity horn speaker pushing up to 126 dBA max SPL for expansive outdoor coverage
- Three built-in microphones with 8m pickup range, AI background noise reduction, and intelligent text-to-speech
- Full-duplex talk-back for natural two-way conversations
- Supports SIP paging, multicast paging, group calls, PTT, call-waiting with priority override
- Wide-band audio with Opus, G.722, and other HD codecs
- Differential LINE IN and LINE OUT for external audio integration
- Dual 10/100Mbps Ethernet: PoE/PoE+/PoE++ input + PoE/PoE+ output for daisy-chaining
- IP66 waterproof/dustproof rating with stainless steel mounting bracket
- Advanced security: TLS/SRTP, HTTPS, 802.1X, secure boot, AES-encrypted configs
- Additional perks: AirPlay, ONVIF/RTSP streaming, local file playback, mobile app control
Comparison to Similar Models
The GSC3518HS is Grandstream's flagship outdoor talk-back option in the GSC series. Here's how it compares to close relatives:
| Model | Speaker Power / Max SPL | Mics & Pickup | IP Rating | Wireless | Primary Use Case | Ideal For |
|---|---|---|---|---|---|---|
| GSC3518HS | 50W / 126 dBA | 3 mics + AI NR + TTS, 8m | IP66 | No | High-volume outdoor talk-back | Large exposed areas, harsh weather |
| GSC3516 | 15W / ~90-100 dBA | 3 directional + 1 omni, 4.2m | None | Wi-Fi + BT | Indoor two-way intercom | Offices, classrooms, hallways |
| GSC3510 | Similar to GSC3516 | 3 directional mics | None | Wi-Fi + BT | Indoor intercom/security | Smaller indoor spaces |
| GSC3505 | Lower (one-way focus) | No mics (output only) | None | No | Basic SIP paging | Indoor/outdoor covered PA |
Pick the GSC3518HS for serious outdoor power and weatherproofing. For indoor or lighter-duty needs, drop to the GSC3516 (wireless perks + more mics) or GSC3505 (budget one-way paging).
Technical Specifications
- Audio Speaker: 50W, 270Hz–13.2kHz frequency response, up to 109 dBA sensitivity @1m/1W, 126 dBA max SPL Microphones: 3 built-in, 8m range, AI noise reduction Codecs: Opus, G.722, G.711 (full/wide-band support)
- Network & Interfaces 2 × 10/100Mbps Ethernet (1× PoE/PoE+/PoE++ input, 1× PoE/PoE+ output) LINE IN/OUT (differential), 2-pin switch-in/out, DC24-48V power option, reset button
- Power PoE/PoE+/PoE++ (802.3af/at/bt) or external DC 24-48V
- Environmental IP66 rated, stainless steel bracket, suitable for harsh outdoor use
- Security & Management TLS/SRTP/HTTPS/802.1X/secure boot, GDMS cloud/local web provisioning
FAQ
How weatherproof is the GSC3518HS really? Fully IP66-rated – it shrugs off powerful jets of water, total dust ingress, and extreme conditions thanks to the rugged horn design and stainless steel hardware.
Is 126 dBA loud enough for my large lot? Yes – that's jet-engine-close levels. It covers football fields, parking areas, or noisy industrial sites clearly without distortion.
Can people talk back clearly outdoors? The 3-mic array with AI noise reduction handles wind, traffic, or machinery well, picking up voices from up to 26 feet away for usable two-way.
What PoE do I need? PoE++ (802.3bt) for full 50W blast. Standard PoE/PoE+ works but caps volume – we recommend upgrading switches for max performance.
Does it work with non-Grandstream PBXs? Yes – standard SIP means easy integration with 3CX, Asterisk, FreePBX, Yealink, and most enterprise systems.
Setup tips from The Telecom Spot? Mount high and tilt down for optimal throw. Test multicast groups first. Lock security (TLS, strong passwords) immediately. Reach out – we do GDMS configs and site surveys regularly for Texas clients.