Tag Archives: amplifier

Internally Speaking: Applications Using the EVS-INT50W

I wrote a blog in May 2015 introducing our new EVS-INT50W internal amplifier. An overview of the product was provided along with a brief mention of applications. In this installment, I would like to discuss a few specific applications: Day Care Centers, Assembly Occupancies, K – 12 Educational Facilities, and Lodging.

evs-int50w-diagram1Day Care Centers is an ideal application for the internal amplifier because of limited wall space for mounting external hardware and the requirement for the 520Hz low frequency output. Many jurisdictions are adopting the 2012 edition of the International Building Code (IBC) which states that a manual fire alarm system that initiates the occupant notification signal utilizing an emergency voice/alarm communication system shall be installed in Group E occupancies.  Day Care facilities fall under a Group E occupancy. In addition, Section 18 of the 2013 edition of NFPA 72 states that effective January 1st, 2014, audible appliances provided for the sleeping areas to awaken occupants shall produce a low frequency alarm signal.

As defined by NFPA 101, an Assembly Occupancy is an occupancy used for a gathering of 50 or more persons for deliberation, worship, entertainment, eating, drinking, amusement, awaiting transportation, or similar uses. A common example of an assembly occupancy is a place of worship where the area of congregation will require voice evacuation. The EVS-INT50W is perfect for this application because vital wall space is saved while providing a 50 watt single speaker circuit amplifier that meets required decibel output and audibility requirements

K – 12 Educational Facilities offer the ability to use the internal amplifier with the flexibility of integrating distributed amplifiers. As with the Day Care Center application, K through 12 educational facilities fall under a Group E occupancy. Since many classrooms and other gathering locations will have an occupant load of greater than 30 people, these facilities are prime candidates for voice evacuation and emergency communications. The 5820XL-EVS and the EVS-INT50W will cover an area or areas of the facility while distributed amplifiers will cover other areas of the facility. This is quickly becoming a popular method of distributing voice.

evs-int50w-diagram2Due to recent code updates and state/local legislation, low frequency is becoming common in the lodging industry. Section 18 of the 2013 edition of NFPA 72 states that effective January 1st, 2014, audible appliances provided for the sleeping areas to awaken occupants shall produce a low frequency alarm signal. Full coverage for low frequency voice evacuation can be accomplished by using a combination of the internal amplifiers and the distributed EVS-100W amplifiers. As with the K – 12 Educational Facilities application, the 5820XL-EVS and the EVS-INT50W will cover an area or areas of the lodging facility while the distributed EVS-100W will cover other areas of the facility.

Do you have applications where the EVS-INT50W would be helpful? Please let us know by clicking on the Leave a Reply link above to enter your request.  Click here to download the EVS-INT50W data sheet.

 

About the Author
Mark Indgjer is a Product Marketing Manager with Silent Knight.  Mark joined Silent Knight in 1988 and is responsible for new product development, product marketing and much more.  Mark is also NICET Level II certified.​

Tech Tip: EVS-INT50W Power Wiring

The EVS-INT50W is an amplifier that offers a single speaker circuit capable of supporting up to 50 watts of power and is compatible with version 15 of the 5820XL-EVS. Although it is similar to the distributed 50, 100, and 125 watt amplifiers, there are subtle differences.

One of the first things you will notice is that the EVS-INT50W does not come with an enclosure. The reason for this — and why it is described as an internal amplifier — is that it mounts in the 5820XL-EVS cabinet. No external cabinet or hardware is required: this provides the benefit of saving valuable wall space as well as installation time and money.

The other difference you will see is that there is no primary AC and battery backup. The EVS-INT50W is powered by the 5820XL-EVS panel. This is where it can get tricky. To power this amplifier, one of the 6 Flexput™ circuits on the 5820XL-EVS will be programmed for Constant Auxiliary Power and run to the power input on the EVS-INT50W. The SBUS connection, which is normally 4 conductors, will be 2 conductors for the A and B data connections. Do not use the SBUS power (- and +) to power the amplifier. The amplifier draws close to 3 amps in full load. SBUS power only supplies up to 1 amp. Be sure to account for the power draw in your 5820XL-EVS battery calculations.

evs-int50w-tech-tip2

The internal amplifier is an addressable device, so be sure to set the dipswitches on the unit before powering it up. Also ensure that the panel is programmed to look for the address you set on the amplifier. After this, all options are programmable, such as mapping the speaker output for proper activation, 25 or 70.7 Vrms operation, Class A or Class B speaker wiring, and 520 Hz low frequency output.

Have you installed the EVS-INT50W? Please let us know your experience by clicking on the Leave a Reply link above to enter your request. Click here to visit the EVS-INT50W web page.

 

About the Author
Bill Root is the Technical Support Supervisor for Silent Knight. Bill joined Silent Knight in 1988 and is responsible for managing applications and technical support across the Silent Knight product line. Bill is also NICET Level II certified.

The New EVS-100W Amp Has Your Back!

sk ampSilent Knight has just released the EVS-100W amplifier with backup capabilities for use with the 5820XL-EVS Addressable Fire Alarm Control with Integrated Voice System version 14.0. The EVS-100W can be used in one of three configurations.

  • 100 watts no backup
  • 50 watts with 50 watts backup
  • 100 watts with 50 watts backup using model number EVS-50WBU daughter board

The EVS-100W will help you meet A&E specifications that require a backup amplifier in emergency communication applications. To help support this new model number, version 3.6 of the Silent Knight Software Suite is available free-of-charge from our website.

Loren Schreiber has been with Silent Knight for 27 years and currently holds the position of Product Marketing Manager.  Loren’s primary focus is obtaining customer needs and requirements for new product development.