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Junior Varsity
Need a louder dj monitor
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<blockquote data-quote="Ivan Beaver" data-source="post: 55925" data-attributes="member: 30"><p>Re: Need a louder dj monitor</p><p></p><p></p><p>A normal "fast" response is not "fast enough" to measure the peaks.</p><p></p><p>I did a show a while back and at FOH (100' or so frfom the stage) I was measuring 118ish dB C slow and 128ish dB dB C Fast. When I went to impulse mode (a very fast response) I was getting around 136dB. So the system was actually producing 136dB peak-but the normal "fast" response time was measuring about 8dB less.</p><p></p><p>It seems you are VERY quick to jump on manufacturer specs-but you don't even use a meter to accurately measure the SPL.</p><p></p><p>There is nothing wrong with a calculated number-if it is based on real numbers.</p><p></p><p>Something ELSE that you probably have not taken into account is the actual measuring distance. If you measure to close to a cabinet-you will likely get a wrong number-because you are in the near field.</p><p></p><p>Many manufacturers measure at a distance away and then "back calculate" to the 1M number. This may not make any sense to you-but you have to realize WHY they do that and what the SPL number is supposed to be used for.</p><p></p><p>It is used to help determine how loud a particular cabinet will be at a particular distnace. Unless the number is based on something that can be used in the calculations-it is a "bad" number.</p><p></p><p>A good distance is 10M away. THen you add 20dB to the number measured (for the 20dB loss over that distance) and you get a usable number.</p><p></p><p>Now 10M may be a bit far-but 2-4 meters is a good number-for small boxes. At least to get closer than a 1M measurement will provide.</p><p></p><p>If you are going to jump on JBL for the bad numbers-then you need to measure other cabinets-IN THE SAME WAY WITH THE SAME METER. I bet you will find that all cabinets fall a bit short. SO then are you going to start to say the everybody is wrong-and YOU are correct?</p><p></p><p>You many find yourself on a very small island real quickly.</p></blockquote><p></p>
[QUOTE="Ivan Beaver, post: 55925, member: 30"] Re: Need a louder dj monitor A normal "fast" response is not "fast enough" to measure the peaks. I did a show a while back and at FOH (100' or so frfom the stage) I was measuring 118ish dB C slow and 128ish dB dB C Fast. When I went to impulse mode (a very fast response) I was getting around 136dB. So the system was actually producing 136dB peak-but the normal "fast" response time was measuring about 8dB less. It seems you are VERY quick to jump on manufacturer specs-but you don't even use a meter to accurately measure the SPL. There is nothing wrong with a calculated number-if it is based on real numbers. Something ELSE that you probably have not taken into account is the actual measuring distance. If you measure to close to a cabinet-you will likely get a wrong number-because you are in the near field. Many manufacturers measure at a distance away and then "back calculate" to the 1M number. This may not make any sense to you-but you have to realize WHY they do that and what the SPL number is supposed to be used for. It is used to help determine how loud a particular cabinet will be at a particular distnace. Unless the number is based on something that can be used in the calculations-it is a "bad" number. A good distance is 10M away. THen you add 20dB to the number measured (for the 20dB loss over that distance) and you get a usable number. Now 10M may be a bit far-but 2-4 meters is a good number-for small boxes. At least to get closer than a 1M measurement will provide. If you are going to jump on JBL for the bad numbers-then you need to measure other cabinets-IN THE SAME WAY WITH THE SAME METER. I bet you will find that all cabinets fall a bit short. SO then are you going to start to say the everybody is wrong-and YOU are correct? You many find yourself on a very small island real quickly. [/QUOTE]
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