NEWS

12/07 - Some Truthful Facts About Sound Projection SoundCommander® Vs Other Systems

By Stefan Pollack
CEO
IMLCORP, Marietta, GA

The facts below are the result of researching the scientific evidence regarding the use of loud sounds in the mid audio frequency ranges.  The research shows that variable sound files or fixed tones in mid range frequencies will do nothing more than annoy individuals after a period of time.  If powerful enough it will definitely get their attention, very well, out to distances of several hundred meters and up to about 2000 meters and possibly more, if the loudspeaker system is strong enough and can produce the sound in frequencies optimized for projection to long ranges

There is no unclassified or easily movable acoustic hailing device (AHD) or high power tactical loudspeaker system on the market that produces any noises or "chirps" in the range of 150Hz up to 20,000Hz that will stop people, disable them, or harm them in any way. 

In order to physiologically affect people with mid range audio the tone would have to arrive at the persons ears at a sound pressure level (SPL) of 151 dB (decibels) or higher continuously.

The effect of high power audio in the middle audible range from about 150Hz to near 18,000Hz can be quite effectively blocked out or reduced simply by wearing push in ear plugs or an over the ear shell type sound protector.

Higher pitch frequency tones from 3000Hz to 5000Hz have no greater effect on individuals than lower pitch tones in the 400 to 2000Hz range.  Lower frequency tones will project to longer ranges.

The human voice will be most easily understood at long ranges when it is reproduced clearly and projected in the normal voice range of about 500Hz to about 1500Hz 

None of the systems produce “non-lethal weapon” effects. 

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04/18/07 - Bringing Order To Chaos In Campus And School Shootings And Incidents

By Stefan Pollack
CEO
IMLCORP, Marietta, GA

MARIETTA, GA   April 17, 2007 – If law enforcement and security personnel at Virginia Tech had used a portable or vehicle-mounted high-powered mass notification public address system specifically designed for incident response, they could have provided students, faculty and the public with timely information, including safety instructions and status reports throughout the campus.

The most important step that any public safety team can take in responding to an incident such as the Virginia Tech shootings is to let everyone know they are in charge. When there is a crowd of any size and people inside a building, a loud, clear public address system gives police the voice power to communicate with everyone affected by the event. Public safety officials can warn people outside to keep clear of an area and provide instructions for them to evacuate. They can warn people to stay away from an area. And if they can get a speaker system inside a building, they have a chance to talk to people directly involved in the hostage situation.

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