{"product_id":"evs-50w-silent-knight-intelligent-50w-amplifier-with-programmable-speaker-circuits","title":"EVS-50W | Silent Knight Intelligent 50W Amplifier with Programmable Speaker Circuits","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-end=\"396\" data-start=\"144\"\u003eThe 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.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable style=\"width: 99.964%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eSilent Knight\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eFire Alarm Systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eEVS-50W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eAmplifiers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eIntelligent Fire Voice Amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003ePower Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003e50 W total output, 25 Vrms or 70.7 Vrms selectable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eSpeaker Circuits\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003e4 fully programmable Class A\/B; expandable to 8 with EVS-CE4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eExpansion Module\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eCompatible with EVS-CE4 audio circuit expander\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eSystem Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003e5820XL-EVS system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eConnections\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003e6-wire harness (2 for VBUS, 4 for SBUS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eDistance from Panel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eMountable up to 6000 feet away\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eSBUS Addressing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eUp to 4 units per system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eSupervision\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eFully supervised amplifier and circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003ePrimary Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003e120 VAC, 60 Hz, 580 mA max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eStandby Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003e85 mA @ 25 Vrms; 100 mA @ 70.7 Vrms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eAlarm Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003e525 mA @ 25 Vrms; 580 mA @ 70.7 Vrms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eBattery Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003e7–35 Ah charging; 18 Ah max internal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eCompliance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eUL 864, UL 2572, NFPA 72\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eDimensions (Flush)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003e14.5W × 24.75H × 3.4D in (36.8 × 62.9 × 8.7 cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eDimensions (Overall)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003e16W × 26.25H × 4.1D in (40.6 × 66.7 × 10.5 cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003eRed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.3202%;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 73.5467%;\"\u003e28 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cbr\u003e\u003c\/h4\u003e\n\u003ch4\u003eInformation About \u003cspan data-sheets-root=\"1\"\u003eEVS-50W\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSupervised 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.\u003c\/li\u003e\n\u003cli\u003eExpandable 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.\u003c\/li\u003e\n\u003cli\u003eSeamless 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.\u003c\/li\u003e\n\u003cli\u003eLong-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.\u003c\/li\u003e\n\u003cli\u003eMultiple 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.\u003c\/li\u003e\n\u003cli\u003eComprehensive supervision: All audio circuits, power supplies, and communication links are fully supervised to detect faults quickly and maintain compliance with fire safety standards.\u003c\/li\u003e\n\u003cli\u003eIndependent 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.\u003c\/li\u003e\n\u003cli\u003eCompliance with standards: Certified to UL 864, UL 2572, and NFPA 72, the EVS-50W meets rigorous safety and performance requirements for emergency communication systems.\u003c\/li\u003e\n\u003cli\u003eDurable 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.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe EVS-50W delivers the reliability and precision required for expanding and enhancing emergency voice communication within Silent Knight fire alarm systems.\u003c\/p\u003e","brand":"Silent Knight","offers":[{"title":"Default Title","offer_id":49105177805056,"sku":"EVS-50W","price":2269.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0388\/5331\/2557\/files\/shopping_-_2025-09-27T105433.363.webp?v=1785541944","url":"https:\/\/alotechparts.com\/products\/evs-50w-silent-knight-intelligent-50w-amplifier-with-programmable-speaker-circuits","provider":"Alo Tech Solutions","version":"1.0","type":"link"}