Grandstream GSC3518HS SIP/Multicast Talk-Back Horn Speaker (50 W, Outdoor)

The Grandstream GSC3518HS is a powerful SIP/multicast talk-back horn speaker designed for large outdoor and indoor paging, intercom, announcement, and communication systems. With a high-fidelity 50 W speaker capable of reaching up to 126 dBA, built-in multiple microphones, and advanced SIP/VoIP features, this rugged speaker is ideal for campuses, parks, warehouses, schools, hospitals, and other expansive areas requiring clear public address and two-way communication.

Built to withstand harsh environments, the GSC3518HS carries an IP66 rating for protection from dust and water, and includes PoE++ support for streamlined network power connectivity.

Key Features & Benefits

50 W High-Fidelity Horn Speaker – Delivers clear, high-volume audio suitable for large coverage areas (~126 dBA max).
SIP/Multicast Paging & Intercom – Supports SIP and multicast paging, call-waiting with priority override, group broadcasting, and talk-back two-way communication.
AI-Based Background Noise Reduction – Multiple built-in microphones with intelligent noise suppression and text-to-speech support for clear talk-back messaging.
Wide Codec Support – Full-band and wide-band audio codecs, including Opus and G.722, for superior audio quality.
Robust Outdoor-Ready Design – IP66 waterproof/dustproof enclosure with stainless-steel mounting bracket for harsh outdoor environments.
Flexible Connectivity – Features two 10/100 Mbps Ethernet ports:
• One with PoE/PoE+/PoE++ input
• One with PoE/PoE+ output for chained device support.

Aux Audio & Line Interfaces – Includes differential Line In/Line Out ports for integration with external audio sources or amplifiers.
Streaming & Playback Support – Allows AirPlay, ONVIF, RTSP/HTTP streaming and playback of local audio files or mobile app audio.

Technical Specifications

Compatibility & Deployment

SIP/VoIP Networks — Integrates seamlessly with SIP-based communication systems, VoIP phones, IP PBXs, and paging servers.
Grand stream Ecosystem — Works well with UCM and Grand stream IP communication platforms as part of enterprise paging and intercom systems.
Outdoor Pa Systems — Designed for expansive outdoor areas and harsh environments thanks to IP66 protection.

⚠ Ensure proper network design (VLAN, QoS, multicast configuration) for optimal paging performance.

What’s in the Box

✔ Grandstream GSC3518HS SIP/Multicast Horn Speaker
✔ Stainless-Steel Mounting Bracket
✔ Networking & Power Accessories (as provided)
✔ Quick Installation Guide
✔ Warranty & Documentation

Frequently Asked Questions (FAQ)

Q: What environments is this speaker suited for?
A: The GSC3518HS is ideal for outdoor campuses, public spaces, large offices, school playgrounds, hospitals, warehouses, parks, and other expansive areas requiring powerful paging and two-way communication.

Q: Does it support two-way talk?
A: Yes — it supports talk-back intercom with multiple microphones and background noise reduction.

Q: What power options are supported?
A: The unit supports PoE/PoE+/PoE++ input and can provide PoE/PoE+ output to another device.

Q: Can it stream audio from network sources?
A: Yes — it supports AirPlay, ONVIF, and RTSP/HTTP streaming sources.