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Junior Varsity
Subwoofer "Throw", Facebook... huh?
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<blockquote data-quote="Ivan Beaver" data-source="post: 91137" data-attributes="member: 30"><p>Re: Subwoofer "Throw", Facebook... huh?</p><p></p><p></p><p>With horn loaded woofers-you have a slightly different "effect" on the inverse square law than with front loaded devices.</p><p></p><p>If you were to take 2 subs ( a relatively long horn -not a short horn) and a front loaded sub-have them at the same SPL at say 30-40' away and then walk towards them-you will notice something.</p><p></p><p>As you get closer and closer to the front loaded cabinet-it will get louder and louder. The same thing will happen with the horn loaded sub-except that when you start to get close (say 10-15') it will not get as loud as fast.</p><p></p><p>The reason is that the acoustic origin of the horn woofer is not at the front of the cabinet-but rather deep inside-and it has already started its "expansion" and inverse square losses before it gets to the front of the cabinet. So even though the cabinets are physically lined up-the woofers are not.</p><p></p><p>So if you were to actually measure at 1M and set the levels the same-at a distance the horn loaded woofer will be louder-hence the reason many people say they "throw" further.</p><p></p><p>That is exactly the reason Danley measures subs at a distance of 10M-to account for this "apparent abnormal" loss up close to the cabinet. And also the fact that the physical size of the subs would give a false impression of a higher SPL at the 1M distance-ALTHOUGH the numbers would be correct-for THAT distance.</p><p></p><p>To me-the whole idea of a specs is to have a set of numbers-that a real designer can use to estimate SPL over larger distances. Most people do not listen @1M-so you need realistic numbers to give an idea what the performance will be at say 100 or 200' (or greater). Yes you can play some "games" with the numbers and measurements (and would not be lying-per say), but those specs don't give an idea of real world performance. </p><p></p><p> Just like giving the sensitivity of a sub spec-without showing any measured data-you have NO idea where that SPL came from. Pretty much a worthless spec-if you ask me. Or adding a 10dB (or more) boost on the low end of a sup response to get the spec sheet numbers "with processing" to look better. HOWEVER you are NO LONGER putting 1 watt (or 2.83V) into the system-you are putting 10 watts or 28.3V into it-so the numbers are VERY deceiving-but people still "latch" onto those numbers as if they would be useful. They will be correct-UNTIL you turn it up! THEN you HAVE to subtract that same amount of boost from the maximum output spec-but nobody ever does that-that would not "look" as good-----------------------------------</p><p></p><p>The idea of using the size of the wavelength is just plain STUPID. IF that were the case-how do they explain how you get bass in headphones-or inside a car? You are not far enough away for the bass waves to develope-so therefore you should not be ables to hear them-yet we do just fine.</p><p></p><p>Another example of just looking at one little aspect and thinking it tells the whole story.</p></blockquote><p></p>
[QUOTE="Ivan Beaver, post: 91137, member: 30"] Re: Subwoofer "Throw", Facebook... huh? With horn loaded woofers-you have a slightly different "effect" on the inverse square law than with front loaded devices. If you were to take 2 subs ( a relatively long horn -not a short horn) and a front loaded sub-have them at the same SPL at say 30-40' away and then walk towards them-you will notice something. As you get closer and closer to the front loaded cabinet-it will get louder and louder. The same thing will happen with the horn loaded sub-except that when you start to get close (say 10-15') it will not get as loud as fast. The reason is that the acoustic origin of the horn woofer is not at the front of the cabinet-but rather deep inside-and it has already started its "expansion" and inverse square losses before it gets to the front of the cabinet. So even though the cabinets are physically lined up-the woofers are not. So if you were to actually measure at 1M and set the levels the same-at a distance the horn loaded woofer will be louder-hence the reason many people say they "throw" further. That is exactly the reason Danley measures subs at a distance of 10M-to account for this "apparent abnormal" loss up close to the cabinet. And also the fact that the physical size of the subs would give a false impression of a higher SPL at the 1M distance-ALTHOUGH the numbers would be correct-for THAT distance. To me-the whole idea of a specs is to have a set of numbers-that a real designer can use to estimate SPL over larger distances. Most people do not listen @1M-so you need realistic numbers to give an idea what the performance will be at say 100 or 200' (or greater). Yes you can play some "games" with the numbers and measurements (and would not be lying-per say), but those specs don't give an idea of real world performance. Just like giving the sensitivity of a sub spec-without showing any measured data-you have NO idea where that SPL came from. Pretty much a worthless spec-if you ask me. Or adding a 10dB (or more) boost on the low end of a sup response to get the spec sheet numbers "with processing" to look better. HOWEVER you are NO LONGER putting 1 watt (or 2.83V) into the system-you are putting 10 watts or 28.3V into it-so the numbers are VERY deceiving-but people still "latch" onto those numbers as if they would be useful. They will be correct-UNTIL you turn it up! THEN you HAVE to subtract that same amount of boost from the maximum output spec-but nobody ever does that-that would not "look" as good----------------------------------- The idea of using the size of the wavelength is just plain STUPID. IF that were the case-how do they explain how you get bass in headphones-or inside a car? You are not far enough away for the bass waves to develope-so therefore you should not be ables to hear them-yet we do just fine. Another example of just looking at one little aspect and thinking it tells the whole story. [/QUOTE]
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Subwoofer "Throw", Facebook... huh?
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