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Junior Varsity
Low ceiling, long room - delays or louder PA?
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<blockquote data-quote="Ivan Beaver" data-source="post: 100761" data-attributes="member: 30"><p>Re: Low ceiling, long room - delays or louder PA?</p><p></p><p></p><p>The thing that many people forget-is that the sound does not stop at the rated pattern-at any freq.</p><p></p><p>It is the point at which the level is 6dB down from on axis.</p><p></p><p>So you can be "completely out of the pattern" and still hear just fine. Granted some freq will be louder than others- and that largely depends on the size of the horn.</p><p></p><p>If the horn is large enough (always a good idea and seemingly forgotten these days) then all of the freq will roll off together.</p><p></p><p>This is a GOOD THING-when you are pointing the main axis at the rear of the room and have people up close. You WANT the level coming out of the speaker to be lower up close-because inverse square will be louder up close-so the two will "cancel each other out"-if everything lines up correctly.</p><p></p><p>The problem is that people are so used to small horns-when they get out of the pattern all the hear is the lower freq coming from the cabinet-that are not on a horn and spilling all over the place.</p><p></p><p>That is not a function of the pattern-but rather a function of a poorly designed cabinet that does not have the same pattern over a wide range of freq. A VERY common problem these days.</p><p></p><p>So if a narrow pattern horn is "blamed" for not having good coverage up front-then most likely it is the design of the cabinet (and lack of a large enough horn) that is to blame-NOT the pattern.</p><p></p><p>Kind of like using a #1 phillips screwdriver trying to drive a #2 phillips screw. You can't get enough torque. Don't blame the phillips-blame it on the fact you are using the wrong size.</p><p></p><p>Sadly these days very few people understand even the basic ideas about freq size-wavelength-interaction and so forth.</p><p></p><p>When you start to understand how it all relates together-it will start to make sense.</p><p></p><p>But hey-it is a lot easier to just stick your head int he sand and "believe" that the simple numbers on the spec sheet are the "truth" and they exist across all freq.</p><p></p><p>It is that belief that causes sound system "design" to fail-NOT the physics. The sound waves are just doing what they have done for thousands of years-but don't blame them if the "designer" does not understand how they work.</p><p></p><p>Once people start to realize that audio waves have SIZE and that SIZE MATTERS (in how you control it), THEN things will start to make sense.</p></blockquote><p></p>
[QUOTE="Ivan Beaver, post: 100761, member: 30"] Re: Low ceiling, long room - delays or louder PA? The thing that many people forget-is that the sound does not stop at the rated pattern-at any freq. It is the point at which the level is 6dB down from on axis. So you can be "completely out of the pattern" and still hear just fine. Granted some freq will be louder than others- and that largely depends on the size of the horn. If the horn is large enough (always a good idea and seemingly forgotten these days) then all of the freq will roll off together. This is a GOOD THING-when you are pointing the main axis at the rear of the room and have people up close. You WANT the level coming out of the speaker to be lower up close-because inverse square will be louder up close-so the two will "cancel each other out"-if everything lines up correctly. The problem is that people are so used to small horns-when they get out of the pattern all the hear is the lower freq coming from the cabinet-that are not on a horn and spilling all over the place. That is not a function of the pattern-but rather a function of a poorly designed cabinet that does not have the same pattern over a wide range of freq. A VERY common problem these days. So if a narrow pattern horn is "blamed" for not having good coverage up front-then most likely it is the design of the cabinet (and lack of a large enough horn) that is to blame-NOT the pattern. Kind of like using a #1 phillips screwdriver trying to drive a #2 phillips screw. You can't get enough torque. Don't blame the phillips-blame it on the fact you are using the wrong size. Sadly these days very few people understand even the basic ideas about freq size-wavelength-interaction and so forth. When you start to understand how it all relates together-it will start to make sense. But hey-it is a lot easier to just stick your head int he sand and "believe" that the simple numbers on the spec sheet are the "truth" and they exist across all freq. It is that belief that causes sound system "design" to fail-NOT the physics. The sound waves are just doing what they have done for thousands of years-but don't blame them if the "designer" does not understand how they work. Once people start to realize that audio waves have SIZE and that SIZE MATTERS (in how you control it), THEN things will start to make sense. [/QUOTE]
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Low ceiling, long room - delays or louder PA?
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