Horizontal dispersion using 'Slot' tweeters (Broadbeam HF pattern 'Short-Throw') Horizontal dispersion with 'Bullet' tweeters (Conical H.F pattern 'Long-Throw') You can use 'Slot' Tweeters as an alternative, which give much greater width of dispersion, but don't carry the treble sound very far. 'Bullet' tweeters give great projection over distances, but have a very narrow conical 'Beam'. and Tweeters are the most directional of all. The directional characteristics of a sound is known as the 'BEAM' as for a car head-light. The amount of times my friggin' ears get wrecked by over-the-top treble ended systems really shags me off.which is why I'm usually dancing somewhere around the back or sides of the main dance-floor, or right up front with my head in the bass-bins.in fact, anywhere to escape the horrible sizzling, ear-frying treble !!Īs I said above.Higher frequencies are more directional, and become more so the higher you go. I have to say, that this is an art not too difficult to achieve, yet it seems to elude alot of club owners. so by flying the top-end units above the floor angled downward, and then balancing the mix between Bass and Mid/Treble end with an active cross-over or graphic, you can keep the music crisp and pumping. Treble end frequencies are easily absorbed by soft matter such as humans !!. On this picture, you can see a typical club efficient system.The bass-bins pump out bass to the floor, whilst the top end and mid-range is handled by 'Flown' units suspended around the dance-floor. Medium venues would be well covered by a mix of Long & Short-throw units. These units' cabinets and treble units are of a 'SHORT-THROW' design, and fill out the sound nicely, creating a reasonable balance throughout the venue !įor smaller live venues the main PA would be comprised of soley 'Short-Throw' units. but this can leave a dead spot around the center, so to re-inforce the signal at the back & center of the hall, overhead 'Flyers' of mid-range & treble/tweeter units are 'Flown' above the main PA angled downward. designed to penetrate to the back of the hall as well as possible. The lower & upper mid-range stacks, and tweeter/treble units in the main PA are 'LONG-THROW'. So the bass bins radiate bass out and around the venue. As you probably know, bass sounds are omni-directional, we dont really percieve them as coming from a directional source as much as higher frequencies. In a big venue, obviously the requirements for a PA sound system are going to be different to that of a system in a small club, even though the volume may actually be higher in the club in proportion to the system used by the large venue.Ībove, is a picture of a typical large venue system. Getting the right cabinet design & positioning makes all the difference. Matching the speakers to the cabinet volume & resonance is one criteria, and cabinet design can cause the outgoing sound to be dispersed widely at a short distance for venues such as a small club, or to project the sound a long distance, such as when one wishes to project a sound to the center and back of a large concert hall or venue. Speaker cabinets are designed to provide the loudest and most balanced sound for a given amplifier input, and utilise different designs to do this depending on the cabinets intended job. Whatever the system, the end desired result is to get the sound to the listener at an even level wherever they are positioned in the venue. PA systems can be as simple as a mixer going into a pair of powered speaker cabs, all the way up to sodding great 100.000 watt modular systems. Well here we are.PA is short for 'Public Address System', and comes originally from army bases, and factories/plants etc, before the advent of amplified gigs & clubs.Incidently, just a bit of historical stuff here: The first amplified rock concert given in the UK was by Tommy Steele believe it or not !!.er. (the following text/section was written/started back in '97 or '98 and added to from time to time) this whole sections due for a re-write tbh, but on with the show anyway. Jan 2008 - This dancetech site has alot of sections, thousands of pages, but this pa section gets well over a million hits a year - almost all those visits are from new people - If you would like to add any type of article or video on building cabs or anything like that to do with PA or live gigging tech or lighting etc you get links to your company or site or whatever. Saxon v Coxsone - Soundsystem History pt3ĭennis Rowe (Saxon Studio) & Blacker Dread (selector of Sir Coxsone sound) go head-to-head, as they.
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