Bosch HORN LOUDSPEAKER 15W WIDW ANGLE SIP - LHN-UC15W-SIP

Bosch LHN-UC15W-SIP Horn Loudspeaker 15W Wide Angle SIP

Overview

The Bosch LHN-UC15W-SIP is a 15W SIP-enabled horn loudspeaker designed for IP-based public address and mass notification systems where wide-area audio coverage, network integration, and extreme-environment durability are non-negotiable. Built from ASA (Acrylonitrile Styrene Acrylate) in RAL 7035 light gray, the LHN-UC15W-SIP connects directly to your IP network via a single RJ45 port — no separate amplifier rack, no analog distribution wiring. It handles SIP calls, scheduled broadcasts, pre-recorded messages, and live paging from any SIP-compatible call manager, making it a practical fit for network audio systems in transportation hubs, industrial facilities, warehouses, and outdoor campuses.

Powering via IEEE 802.3af (Class 3) or IEEE 802.3at (Class 4) PoE/PoE+, this unit eliminates separate power runs to every speaker location — your existing PoE switch infrastructure does the work. At PoE+ rated output, it delivers a genuine 15W into its class D amplifier, reaching 118 dB SPL maximum. That is loud enough to cut through ambient industrial noise at range. At standard PoE, rated output is 7W with 115 dB SPL maximum — still substantial for most outdoor paging applications. Explore the full Bosch catalog for compatible call stations and system controllers.

Key Features

• 118 dB Max SPL (PoE+): At full 15W PoE+ drive, this speaker produces 118 dB SPL — enough headroom to cut through loading dock noise, industrial HVAC, or outdoor ambient without stacking multiple units. At PoE (7W rated), 115 dB is still well above the threshold for intelligible emergency paging in noisy environments.
• Wide-Angle Horn Coverage — 140°x180° at 1 kHz: The 140° horizontal by 180° vertical dispersion at 1 kHz means a single unit covers a very broad cone — useful for intersections, wide corridors, or open warehouse floors where you want one device per zone rather than multiple narrower horns. At 4 kHz, the pattern tightens to 40°x40°, which is normal horn physics — factor this into your aiming when high-frequency intelligibility at distance is the priority.
• SIP Native — No Gateway Required: Registers directly to any SIP call manager (PBX, PABX, Cisco UCM, Asterisk). Supports G.711, G.722, and Opus audio codecs. G.722 delivers wideband (7 kHz) audio quality for voice intelligibility; Opus supports adaptive bitrate. This removes the analog gateway hardware from the bill of materials and simplifies system architecture for IP-first sites.
• 300 MB Onboard Message Storage: Store up to 300 MB of pre-recorded announcements locally — WAV, MP3, Ogg Vorbis, or Opus formats. Scheduled or triggered playback runs independently of the call manager, so evacuation tones or shift-change alerts fire even if the network SIP server is temporarily unreachable.
• Integrated Omnidirectional Electret Condenser Microphone: The built-in mic enables two-way SIP communication and local audio monitoring without adding a separate intercom device. Useful for gate intercoms, access control audio points, or supervisor check-in stations that need speaker and mic in a single weatherproof housing.
• -40°C to +55°C Operating Range: ASA construction and a -40°C to +55°C (-40°F to +131°F) operating temperature range means this unit installs in cold-storage dock approaches, northern outdoor sites, and hot equipment rooms alike. Storage temperature extends to +70°C, so it survives a summer in an unconditioned enclosure.
• IEEE 802.3af/at PoE — Single-Cable Install: Data and power over one Cat5e/Cat6 cable simplifies conduit runs and reduces installation labor. Idle draw is under 5W (PoE) or 6W (PoE+), so standby power budget per port is predictable. Full-rated draw peaks at 13W (PoE) or 26W (PoE+) — confirm your switch port budget before committing to PoE+ on high-density deployments.
• 48 kHz DSP with <45 ms Signal Latency: The onboard 48 kHz DSP handles equalization and audio processing internally. Sub-45 ms latency keeps live paging audio synchronized across zones — important for sites where multiple speakers cover overlapping areas and comb-filtering from delayed signals would reduce intelligibility.
• Gigabit Ethernet Port (100BASE-Tx / 1000BASE-T): The single RJ45 supports both 100BASE-Tx and 1000BASE-T — connect to either Fast or Gigabit PoE switches without adapter concerns. IPv4, UPnP, HTTP/HTTPS, NTP, and TCP/UDP are all supported for network management and provisioning.
• MTBF 1,000,000 Hours: A rated mean time between failures of one million hours reflects the component selection and design intent for always-on life safety and paging applications. In practical terms, this is a device you commission and do not expect to revisit for scheduled maintenance.

Integration & Compatibility

The LHN-UC15W-SIP is native SIP (RFC-compliant), registering as a SIP endpoint on any standards-based call manager. Supported protocols include IPv4, SIP, NTP, TCP, UDP, HTTP, HTTPS, IPv4 link-local, and UPnP — enough for auto-discovery and remote provisioning on managed networks. Audio codec support (G.711, G.722, Opus) covers legacy PSTN-bridged systems, wideband VoIP, and adaptive-bitrate Opus-capable controllers. The line-level input and output (1V max, input impedance >10 kΩ, output impedance <100 Ω) allow integration with analog audio sources or downstream analog zones — useful in hybrid analog/IP campus systems. Wire gauge compatibility runs AWG 28 through AWG 14 with an M20 polyamide cable gland accepting 5–12 mm cable diameter. This unit pairs naturally with Bosch Praesensa or Praesideo system controllers and any third-party SIP PBX environment. For larger deployments, review mass notification system planning to size call manager capacity and PoE switch budgets correctly before ordering.

Frequently Asked Questions

Q: What is the maximum sound pressure level of the LHN-UC15W-SIP?

A: When powered by PoE+ (IEEE 802.3at Class 4) at full 15W rated output, the LHN-UC15W-SIP reaches 118 dB SPL maximum. On standard PoE (IEEE 802.3af Class 3) at 7W rated output, maximum SPL is 115 dB.

Q: Does the LHN-UC15W-SIP require a separate amplifier?

A: No. The LHN-UC15W-SIP contains an integrated 15W class D amplifier and connects directly to your IP network via a single RJ45 PoE port. No external amplifier or analog distribution hardware is required.

Q: What SIP audio codecs does the LHN-UC15W-SIP support?

A: The unit supports G.711 (narrowband), G.722 (wideband, 7 kHz), and Opus (adaptive bitrate). This covers integration with legacy PSTN-bridged PBX systems, wideband VoIP call managers, and Opus-capable SIP controllers.

Q: What audio file formats can be stored on the device?

A: The LHN-UC15W-SIP provides 300 MB of onboard storage and supports WAV, MP3, Ogg Vorbis, and Opus formats for pre-recorded messages. Stored messages can play back locally without active network connectivity to the SIP server.

Q: What is the operating temperature range of the LHN-UC15W-SIP?

A: Operating temperature is -40°C to +55°C (-40°F to +131°F). Storage temperature extends to +70°C (158°F). The ASA horn construction supports outdoor and cold-storage installations without additional heating or cooling provisions.

Q: What is the coverage angle of the horn?

A: At 1 kHz, the LHN-UC15W-SIP covers 140° horizontal by 180° vertical — very wide, suited to broad-zone paging. At 4 kHz, the pattern narrows to 40°x40°, which is typical horn directivity. Aim the horn with the high-frequency narrowing in mind when maximizing intelligibility at the far end of a zone.

Ted Perry

The LHN-UC15W-SIP is the unit I reach for when a project needs outdoor or industrial-grade paging with genuine IP integration — not an analog horn bolted onto a network adapter. The 140°x180° coverage at 1 kHz is the spec that shapes system design: on a loading dock or open yard, one device per zone is realistic, which keeps both your cable count and your PoE port budget manageable. That said, watch the 4 kHz narrowing to 40°x40° when you're planning for speech intelligibility at distance — horn physics does not change, and you need to aim this unit accordingly if the listener is not centered in the near field.

Technical Highlights:

• PoE vs. PoE+ Output Gap: The difference between 115 dB (7W PoE) and 118 dB (15W PoE+) is 3 dB — a doubling of acoustic power. If your facility has significant ambient noise (HVAC, conveyor, vehicle traffic), that 3 dB delta can determine whether the announcement is clearly intelligible or merely audible. Budget PoE+ ports for any noisy-environment deployment.
• 300 MB Local Storage + Sub-45 ms DSP Latency: Stored messages fire locally even if the SIP server is unreachable — the 300 MB capacity holds hours of pre-recorded announcement content in WAV or Opus. The <45 ms DSP latency matters for synchronized multi-zone paging: above roughly 50 ms, comb filtering from overlapping speakers becomes perceptible and degrades intelligibility.
• MTBF 1,000,000 Hours: At rated MTBF, statistical failure probability over a 10-year service life is under 10%. For life-safety paging applications where failure means missed emergency alerts, this is the right reliability class — but it does not substitute for network redundancy at the SIP controller level.

Deployment Considerations:

• The M20 cable gland accepts 5–12 mm diameter cable (AWG 14–28). Confirm your cable OD before pulling — oversized armored or shielded runs may not fit without an adapter gland. The polyamide (nylon) gland is not rated for continuous chemical exposure; in wash-down or chemical-plant environments, specify a stainless or chemical-resistant gland separately.
• Operating humidity is 5–95% non-condensing. In environments where condensation is possible (cold-storage door approaches, dawn/dusk temperature swings in open-sided structures), factor in enclosure vapor management — the housing material handles the temperature range, but the non-condensing humidity ceiling is a real constraint.

This unit is well-positioned for outdoor perimeter paging at manufacturing and logistics campuses where a single PoE+ drop per zone, SIP registration to an existing call manager, and genuine -40°C cold-weather tolerance make the total installed cost straightforward. It is not the right choice for precision directional coverage of a narrow corridor or for an indoor-only installation where a ceiling speaker would cover the zone at lower cost — in those cases, a narrower-pattern or lower-SPL Bosch network speaker is the more proportionate solution.