EVS-50W | Silent Knight Intelligent 50W Amplifier with Programmable Speaker Circuits
Silent Knight · Industrial Automation & Electrical
Description The Silent Knight EVS-50W is an intelligent 50-watt amplifier designed for use with the 5820XL-EVS system, supporting Class A or B speaker circuits. It offers expansion up to 8 circuits, selectable 25V or 70.7V operation, and can be installed up to 6000 feet from the main panel. Technical Specifications Condition New/Never Used Surplus Brand Silent Knight Category Fire Alarm Systems Part Number EVS-50W Subcategory Amplifiers Type Intelligent Fire Voice Amplifier Power Rating 50 W total output, 25 Vrms or 70.7 Vrms selectable Speaker Circuits 4 fully programmable Class A/B; expandable to 8 with EVS-CE4 Expansion Module Compatible with EVS-CE4 audio circuit expander System Compatibility 5820XL-EVS system Connections 6-wire harness (2 for VBUS, 4 for SBUS) Distance from Panel Mountable up to 6000 feet away SBUS Addressing Up to 4 units per system Supervision Fully supervised amplifier and circuits Primary Power 120 VAC, 60 Hz, 580 mA max Standby Current 85 mA @ 25 Vrms; 100 mA @ 70.7 Vrms Alarm Current 525 mA @ 25 Vrms; 580 mA @ 70.7 Vrms Battery Capacity 7–35 Ah charging; 18 Ah max internal Compliance UL 864, UL 2572, NFPA 72 Dimensions (Flush) 14.5W × 24.75H × 3.4D in (36.8 × 62.9 × 8.7 cm) Dimensions (Overall) 16W × 26.25H × 4.1D in (40.6 × 66.7 × 10.5 cm) Color Red Weight 28 lbs Information About EVS-50W The EVS-50W is an intelligent amplifier by Silent Knight that provides 50 watts of supervised audio power for emergency voice systems. It integrates directly with the 5820XL-EVS platform via SBUS and VBUS connections, supporting four onboard Class A or B speaker circuits that can be expanded to eight with the EVS-CE4. With selectable output of 25V or 70.7V, daily supervision, and compatibility for mounting up to 6000 feet from the main panel, the EVS-50W is engineered for system flexibility. It includes its own power supply and backup battery support, making it a reliable component in fire alarm and emergency communication systems. Key Features: Supervised 50W audio output: The EVS-50W delivers 50 watts of supervised audio power that can be configured for either 25 Vrms or 70.7 Vrms, ensuring compatibility with a wide range of notification appliances and voice evacuation needs. Expandable speaker circuits: The unit includes four programmable Class A or Class B speaker circuits out of the box and can be expanded to eight circuits with the optional EVS-CE4 expander, providing flexibility for larger installations. Seamless 5820XL-EVS integration: Designed specifically for use with the Silent Knight 5820XL-EVS control panel, the amplifier connects via a six-wire harness—two wires for the Voice Bus (VBUS) and four for the SBUS—for reliable communication. Long-distance installation capability: The EVS-50W can be mounted up to 6000 feet away from the main 5820XL-EVS panel, allowing distributed placement throughout a facility for optimized coverage. Multiple unit support: The system allows up to four EVS-50W amplifiers per installation, each with a unique SBUS address, expanding system voice capacity for larger buildings. Comprehensive supervision: All audio circuits, power supplies, and communication links are fully supervised to detect faults quickly and maintain compliance with fire safety standards. Independent power system: The amplifier includes its own power supply and battery charging system, supporting 7–35 Ah batteries (18 Ah maximum within the cabinet) for reliable backup during power outages. Compliance with standards: Certified to UL 864, UL 2572, and NFPA 72, the EVS-50W meets rigorous safety and performance requirements for emergency communication systems. Durable construction: Housed in a robust red enclosure with overall dimensions of 16 × 26.25 × 4.1 inches, it is built for reliability and straightforward installation in commercial environments. The EVS-50W delivers the reliability and precision required for expanding and enhancing emergency voice communication within Silent Knight fire alarm systems.
Brand: Silent Knight · Category: Industrial Automation & Electrical
Key features
- Supervised 50W audio output: The EVS-50W delivers 50 watts of supervised audio power that can be configured for either 25 Vrms or 70.7 Vrms, ensuring compatibility with a wide range of notification appliances and voice evacuation needs.
- Expandable speaker circuits: The unit includes four programmable Class A or Class B speaker circuits out of the box and can be expanded to eight circuits with the optional EVS-CE4 expander, providing flexibility for larger installations.
- Seamless 5820XL-EVS integration: Designed specifically for use with the Silent Knight 5820XL-EVS control panel, the amplifier connects via a six-wire harness—two wires for the Voice Bus (VBUS) and four for the SBUS—for reliable communication.
- Long-distance installation capability: The EVS-50W can be mounted up to 6000 feet away from the main 5820XL-EVS panel, allowing distributed placement throughout a facility for optimized coverage.
- Multiple unit support: The system allows up to four EVS-50W amplifiers per installation, each with a unique SBUS address, expanding system voice capacity for larger buildings.
- Comprehensive supervision: All audio circuits, power supplies, and communication links are fully supervised to detect faults quickly and maintain compliance with fire safety standards.
- Independent power system: The amplifier includes its own power supply and battery charging system, supporting 7–35 Ah batteries (18 Ah maximum within the cabinet) for reliable backup during power outages.
- Compliance with standards: Certified to UL 864, UL 2572, and NFPA 72, the EVS-50W meets rigorous safety and performance requirements for emergency communication systems.
- Durable construction: Housed in a robust red enclosure with overall dimensions of 16 × 26.25 × 4.1 inches, it is built for reliability and straightforward installation in commercial environments.
Specifications
| Manufacturer part number | EVS-50W |
|---|---|
| Condition | New/Never Used Surplus |
| Brand | Silent Knight |
| Category | Fire Alarm Systems |
| Part Number | EVS-50W |
| Subcategory | Amplifiers |
| Type | Intelligent Fire Voice Amplifier |
| Power Rating | 50 W total output, 25 Vrms or 70.7 Vrms selectable |
| Speaker Circuits | 4 fully programmable Class A/B; expandable to 8 with EVS-CE4 |
| Expansion Module | Compatible with EVS-CE4 audio circuit expander |
| System Compatibility | 5820XL-EVS system |
| Connections | 6-wire harness (2 for VBUS, 4 for SBUS) |
| Distance from Panel | Mountable up to 6000 feet away |
| SBUS Addressing | Up to 4 units per system |
| Supervision | Fully supervised amplifier and circuits |
| Primary Power | 120 VAC, 60 Hz, 580 mA max |
| Standby Current | 85 mA @ 25 Vrms; 100 mA @ 70.7 Vrms |
| Alarm Current | 525 mA @ 25 Vrms; 580 mA @ 70.7 Vrms |
| Battery Capacity | 7–35 Ah charging; 18 Ah max internal |
| Compliance | UL 864, UL 2572, NFPA 72 |
| Dimensions (Flush) | 14.5W × 24.75H × 3.4D in (36.8 × 62.9 × 8.7 cm) |
| Dimensions (Overall) | 16W × 26.25H × 4.1D in (40.6 × 66.7 × 10.5 cm) |
| Color | Red |
| Weight | 28 lbs |
| Product type | Amplifiers |
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