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The following article was featured in Australian AV Magazine and was written by Andy Ciddor.
IML Connector – Things have got personal in the world of meetings PA
It’s not often appreciated that the reinforcement of ordinary speech
from untrained speakers is among the most demanding of PA applications. When we listen to a song, if we miss a syllable or two, we can probably fill in the blanks from memory. But when somebody is speaking, we generally don’t know the lyrics, so we have to hear everything that’s being said; without echoes and delays. And it really helps intelligibility if what we hear is in full lip-sync with the speaker or their image on a screen. At the pinnacle of difficulty for spoken word reinforcement systems is the seminar or open forum. Not only does the speech come from the presenters at the front of the room, but questions and contributions may come from any point in the room and must be intelligible at every point in the room.
FANTASY PA
Let’s sketch out the specification for an ideal PA system. It would have absolutely perfect coverage, delivering ideal listening levels to every member of the audience. It would have zero delay to every ear in the room, and would have flat frequency coverage across the entire listening spectrum. You may have read your share of brochures promising just such a system, and you may even have spent money discovering that some of the laws of physics stubbornly refuse to yield to wishful thinking.
If you’ve given it much thought, you’ve probably worked out that the nearest you’ll ever get to this ideal PA is to hand every member of the audience their own pair of high quality headphones with a volume control. Every other PA you ever build will be a compromise. Whether it falls short in the areas of consistent levels, time alignment, reflected images, time delay or phase alignment, no big-bang (large source) PA really gets it all right for every listener in the house.
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