Solar Speakers’ Solve Logistics Issues for Giant Voice Systems




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Marietta, GA   May 20, 2015 – SOC Nevada LLC estimates it avoided millions in infrastructure costs by installing a solar-powered, wireless mass notification system consisting of six SoundCommander® SC360 speaker systems to cover approximately 212 square miles at the Hawthorne Army Depot, Hawthorne, NV.


The US Army mandated the new mass notification system (MNS) to upgrade security at the facility, which serves as a weapons storage and transportation site for branches of the US Armed Services on the West Coast. SOC, the contractor to manage operations and maintain the facility, chose the giant-voice SC360 systems from IMLCORP, Marietta, GA in three configurations because of their power and voice clarity and their manufacturer’s ability to deliver the solar system to back-up the batteries and the wireless system to communicate with each speaker from a central operations center. And the system fit the budget, too, with the system costing less than 10 percent of a wired installation.


“Before we installed the new SoundCommander system, we had a single speaker on an industrial building on the base,” said David Ellis, Planner/Estimator, SOC Nevada. “That just didn’t have the capability to provide warnings and instructions for the base in the event of an active shooter, a terrorist attack or any conditions where we need to warn personnel.”


In addition to warning personnel on the base, the new MNS will be audible to people not connected with any other type of communication system. The base surrounds the city of Hawthorne, with its population of 3,300, and easements allow highways to pass through the area.


Installing wired power and communications infrastructure would have faced challenges beyond the estimated expense of as much as $5 million, Ellis noted. The high winds that buffet the area precluded any above-ground lines, and soil conditions for trenching and then housing the lines, plus the marking requirements, made solar and wireless the only viable option. The farthest speaker in the network is located eight miles from the base’s operation center.


For IMLCORP, the system design and solar/wireless adaptation were straightforward, customized engineering solutions.







Giant Voice

Solar/Wireless SoundCommander... Saves millions....

Solar/Wireless SoundCommander® MNS Saves Millions in Infrastructure Costs; Giant-Voice Installation at Hawthorne Army Depot Enables SOC Nevada to Meet Mandate

“We used sound measurement equipment to determine how much speaker power was required to provide the required volume levels in all coverage areas,” said Frank M. Myers, President and CEO, IMLCORP. “That enabled us to configure each of the speaker arrays using our SC360 High Performance Speaker Array (HPSA) systems, all of which have 3600 coverage for optimum performance. For three locations, we installed SC360 Quad Hex systems (four stacked six-speaker arrays). For two locations, we installed SC360 Dual Hex units (two tiers – 12 speakers), and one location needed a single SC360 (one tier – six speakers).


“All of our systems come standard with battery backup, so we already have battery power for our SC360s,” he continued. “It was just a matter of integrating the solar panels and power controllers with the HPSAs and using wireless IP (internet protocol) to set up the communication system. That enables operators to activate any array at any time and receive full parametric status monitoring at the control center – 100 percent of the time, 24/7. They know the status of each array at any time, including battery level, amplifier status, system temperature and whether the system amplifier’s cabinet door is open or closed.  This level of parametric monitoring not only insures real-time awareness of the system’s readiness, but saves maintenance and repair costs by allowing system techs be more efficient and take preventative measures as needed to ensure the system is ready at all times.  We can design and install a mass notification system like this anywhere in the world.”


The system gets a daily test with the playing of colors at the start of the day and lowering the flag at the end of each day. The music is pre-recorded, and the scheduling is automated.


“I like the way it works,” Ellis said. “It has simplicity of use and maintenance. We just need to check for the same things at every location.”

IMLCORP installed Sound Commander® SC360 HPSA units such as this at Hawthorne Army Depot as part of a six location mass notification system using all SoundCommander High Performance Speaker Arrays (HPSAs). IMLCORP configured the system to use solar power to maintain full batteries and wireless IP communications to activate any or all speakers to issue warnings and messages over an approximate 212-square-mile area.




We’re getting a lot of interest in attaching solar panels to our SoundCommander® Giant Voice loudspeakers for deployable and fixed-location systems. The solar panels can head off a number of logistics problems, ranging from hauling fuel for powering generators to avoiding infrastructure costs to hardwire them to power grids.


All SoundCommander speakers come standard with battery backup, so it is just a matter of using the solar panels to charge the batteries in the HPSAs (High-Power Speaker Arrays).  The solar panels are easily attached to the speaker, and they can be sized to match sunlight conditions to provide the power to keep a battery charged overnight.


The speaker system can remain completely untethered by using wireless IP (internet protocol) to set up the communication system. This enables operators to activate any array on the network at any time and receive full parametric status monitoring at the control center – 100 percent of the time, 24/7. They know the status of each array at any time, including battery level, amplifier status, system temperature and whether the system amplifier’s cabinet door is open or closed.  This ensures real-time awareness of the system’s readiness and saves maintenance and repair costs by allowing system techs to take remote preventative measures and go on-site only when needed to ensure the system is ready at all times.


Using solar power and IP communications enhances the deployment capabilities of the SoundCommander SC3500 system, designed for use in temporary locations. Two people can set up the entire system in less than 15 minutes, and the speaker can provide clearly understood voice message for up to 5200 feet (1600 meters) for mass notification operations.


For fixed locations, the SoundCommander SC360 can be permanently installed on buildings or utility poles to provide similar emergency mass notification capabilities while withstanding extreme weather capabilities.


We can design and install (for fixed locations) a mass notification system with solar-powered battery charging and IP communications for use anywhere in the world. Visit our website pages for the SC3500 and SC360 to learn more about each system and download specification sheets – and contact us to get answers to your questions or arrange a demonstration.







Giant Voice

Solar/Wireless SoundCommander... Saves millions....

‘Solar Speakers’ Solve Logistics Issues for Giant Voice Systems

Designing and Specifying the Right Loudspeaker System for Emergency Mass Notification in Public Venues

Designing and Specifying

Emergency Mass Notification




A properly designed and specified loudspeaker sound system is essential for an effective emergency mass notification system in any public venue.  In an emergency, everyone in the affected area must be able to get the same information – and instructions – “loud and clear” for the best possible outcome.


Whether it’s a public-safety matter, such as an accident, fire or terrorist incident, or a weather-related incident, such as a tornado or wildfire, sound volume and clarity are equally important. When commotion and confusion are compounded by language problems, only the highest levels of sound volume and voice clarity will shorten the time to process information and follow potentially life-saving instructions.


If you are considering fixed-position, high-power speaker arrays (HSPAs) for your venue’s emergency mass notification system, you should follow these steps throughout the design-and-bid process. Paying attention to the details of your needs and sound technology will help you get the right system for your needs.


Start with an on-site acoustic sound survey.

The sound survey will help you determine the best locations for fixed HSPAs and the sound levels you’ll need at each targeted point. Some points to keep in mind:

  • Measure sound levels – typically expressed as decibels, or dB – where you want the sound to be heard. You’ll need to overcome the loudest-possible ambient noise, such as from traffic, crowd or wind noise or mechanical equipment, depending on the type of venue you have. Log the Leq (Equivalent Average Level) background sound levels and chart the noises heard during the survey. Each test at each location should last at least five minutes using a tripod-mounted sound analyzer system set at 5’4” in height.
  • You’ll want your loudspeaker to deliver sound at the targeted area 6 to 10 dB above the ambient level. Six dB is the minimum; 10 is double the ambient noise level.  Make sure every vendor who bids on the project has your sound measurements so they know your requirements at each point.
  • Correlate your target sound levels with venue’s physical characteristics to determine the placement of speaker arrays on towers, poles or rooftops. Buildings and trees, for example, can block sound waves, and sound waves can pass over spaces between buildings or over ravines and other steeply lower places.  Manufacturers design speakers to meet specific needs. You can get the flexibility to focus sound in a more narrowly defined area or a wider area. Just know the sound level you need to reach at the target area and make sure you have taken all of your site’s physical characteristics into account.



















Specify the right equipment.

Not all loudspeakers are created equal, and not all sound pressures are equally loud. This is because the human ear does not respond equally to all frequencies.  Power and intelligibility are both necessary. Humans are much more sensitive to sounds in the frequency range of 400 to 6500 Hz, and harmonic distortion should be less than 1 percent at full RMS power.


Don’t “cheap out” with a system designed for sirens or a lesser-quality system. For voice, several manufacturers, such as IMLCORP, offer systems such as our SoundCommander line, designed specifically for outdoor mass notification. Your system should meet all minimum standards for range and clarity, and it should integrate with other mass-notification platforms, such as indoor speakers, alarm systems, email and telephone dialers.




Here are some technical factors to consider when specifying your system:

  • Speaker arrays for fixed systems should have a full 3600 range to ensure coverage in all directions. However, placement conditions may necessitate using arrays that can concentrate more sound in a 1800 range.
  • Each fixed-system speaker array should have a minimum effective range of up to 800m in diameter.
  • Wireless UHF transmission systems have severe limitations. High-quality voice transmission cannot be technically possible because of legal restrictions regarding the very narrow frequency band spread allocated for UHF transmitters for emergency notification systems.  The baud (transmission) rate is too low, and the audio band width of the channel is limited to a total of about 2000 Hertz (Hz) audio frequency response at best.  Systems that depend on licensed UHF transmission can work well as digital controllers for setting off sirens, reporting unit status, etc. Because of the narrow frequency limitations of the transmitters, the loudspeaker drivers included with those systems are also not designed for the wider fidelity required for quality intelligible voice audio.
  • Systems should have battery backup capable of providing four hours of continuous operation.
  • The system should be able to handle multiple broadcast nodes – groupings of HPSAs – throughout the coverage area. Each node can have up to four HPSAs.
  • Systems that meet military specifications will be able to withstand severe outdoor weather conditions, including hot-cold swings, precipitation and airborne particulates, such as salt from seaside locations and effluents from industrial facilities.

Sound from your loudspeaker should reach the targeted area 6 to 10 dB above the ambient level.

Integrate with other mass notification technologies.

There is no single solution when it comes to notifying people in an emergency. Getting the same information at the same time to everyone affected is necessary to help you protect and save lives.

When it comes to notifying people, you have many “targets” to consider – and all are important. A lot of moving parts must work together.

  • People in buildings need to get the same message at the same time through an integrated system of indoor alarms and speakers, graphic displays, electronic signage and messages delivered via the Internet and mobile devices. The system should tell them to stay where they are or where to find a safer location.
  • People not yet in the affected area need to hear the loudspeaker announcement. Therefore, you should consider speakers that you can aim outside your venue.
  • Emergency responders from various agencies converging at the scene can serve people more effectively by hearing the instructions given to the public and other responders. This is why voice must be clear and intelligible. The minimum standard is that 50 percent of words be understood – a 0.5 level – but that’s inadequate. Being 70 percent understandable – a 0.7 level – is much better, and a higher level is better still. It is possible to achieve levels above 0.8.

An integrated emergency mass notification system can give everyone in the affected area the same information.

Use pre-recorded messages in multiple languages to save time and avoid confusion.

You can fill a huge void if your emergency mass notification system has a component that can play pre-recorded warnings and messages in several languages.



IMLCORP’s AlertCommander warning and voice message delivery system, which works with our SoundCommander loudspeakers, is an example of how this technology should work. You should be able to choose from a large library of warning tones and prerecorded voice messages that cover all types of emergencies. It should be a matter of policy and procedure to determine the warning tones, messages and languages you will need. Then, you can use a system of computerized folders, all accessible within your message-delivery-device software, to group messages and to sequence when to play them back.


Three important requirements for your message-delivery system are:

  • The ability to work with a computer at the command center and from a wireless handheld device so that you can change messages to provide more up-to-date information.
  • The ability to switch from pre-recorded messages to live messages as your emergency-response needs change. You should be able to make live announcements from your command center or from the field.
  • The capability to easily combine messages from its library and record and play new messages as conditions require.


Have the ability to access your system from an off-site location.

The time and conditions of any type of emergency at a public venue may require the activation of the emergency mass notification system from a cell phone, landline or off-site computer. Further, you may need to change messages for your loudspeakers and other notification platforms as events unfold. Make sure that the system you specify has this capability and that your policies and procedures definitively state who has access to the system and how it is to be used.


One final point to keep in mind is that integrating all the components of a comprehensive emergency mass notification system is highly feasible. Specifying and installing a system does require attention to many details, and it does require clear policies and procedures to activate the system and use it effectively to protect lives and property. But it can — and should — be done.


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