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Meyer Sound Harsh?
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<blockquote data-quote="Curtis H List (Too Tall)" data-source="post: 31549" data-attributes="member: 160"><p>Re: Meyer Sound Harsh?</p><p></p><p>Hi Jeff,</p><p>I ran the original UPA with the old style (pre-powerlite) QSC amps.</p><p>This combination and was often Harsh. It REALLY hated it when the amps clipped.</p><p>I have no experience with the newer “Ultra” models sounded like.</p><p>I quit mixing November 1997.</p><p></p><p>As for listening to this box at 1 meter this is a very bad idea.</p><p>This box was NOT designed for near field listening.</p><p></p><p>For Near Field use you must either have small drivers or coax drivers because the compression driver and the 12” woofers voice coil are not at the same distance to the listener. As soon as you put the horn next to the woofer you have a problem with Near Field listening.</p><p></p><p>One of the first things I must decide when approaching a new design is where on the baffle you will be listening to it.</p><p>Half way between the center of the woofer and the center of the horn?</p><p>On axis to the horn?</p><p>So other place for a strange reason? Some Home audio speakers are designed to be pointed straight ahead instead of pointing the dome tweeter at the listening position.</p><p>Often because they had an on axis spike that did not show up off axis. Yet the dispersion is enough so that you do not lose the high frequency information you want. </p><p>The friend who is seated in front of the speaker has his ears burned…LOL</p><p></p><p>I typically go with half way between on this kind of box.</p><p>If you design it for on axis to the horn then when you listen at a close distance you should listen on axis to the horn. Because since you drivers are not coaxial as you move your ear up and down on the baffle the distance to the horn and woofer constantly change. </p><p>So how the drivers combine in the xover region changes.</p><p>This is the crux of the matter because it changes the way the frequency response changes in the all important xover region. By moving that close it can give you peaks or holes anywhere from 500Hz to 2500Hz again depending on how the xover filters combine.</p><p></p><p>If I get a chance I will send you a picture from my modeling software showing how things can change because of the listening distance.</p><p></p><p>As you listen further away the difference from your ear to the woofer and compression driver gets closer and closer till these is no difference.</p><p>At a longer distance is where you want to design to.</p><p>If you make it measure and work correctly at 1 meter and on axis to the horn it will sound bad everywhere else.</p><p></p><p>To properly measure a multi way speaker you should take the longest dimension of the baffle (Height?) and multiple times four.</p><p>So a two feet height means the measurement mic should be at least eight feet from the baffle.</p><p></p><p>They call this the distance the speaker system needs for the drivers to “integrate” correctly.</p><p></p><p>If the UPA is designed for half way between the horn center and the woofer center your best result for listening at 1 meter is make sure that center spot is level with your ear. More than dispersion problems, which there may be, the timing for when the sound from the horn and woofer gets to your ear is correct for the xover design used.</p></blockquote><p></p>
[QUOTE="Curtis H List (Too Tall), post: 31549, member: 160"] Re: Meyer Sound Harsh? Hi Jeff, I ran the original UPA with the old style (pre-powerlite) QSC amps. This combination and was often Harsh. It REALLY hated it when the amps clipped. I have no experience with the newer “Ultra” models sounded like. I quit mixing November 1997. As for listening to this box at 1 meter this is a very bad idea. This box was NOT designed for near field listening. For Near Field use you must either have small drivers or coax drivers because the compression driver and the 12” woofers voice coil are not at the same distance to the listener. As soon as you put the horn next to the woofer you have a problem with Near Field listening. One of the first things I must decide when approaching a new design is where on the baffle you will be listening to it. Half way between the center of the woofer and the center of the horn? On axis to the horn? So other place for a strange reason? Some Home audio speakers are designed to be pointed straight ahead instead of pointing the dome tweeter at the listening position. Often because they had an on axis spike that did not show up off axis. Yet the dispersion is enough so that you do not lose the high frequency information you want. The friend who is seated in front of the speaker has his ears burned…LOL I typically go with half way between on this kind of box. If you design it for on axis to the horn then when you listen at a close distance you should listen on axis to the horn. Because since you drivers are not coaxial as you move your ear up and down on the baffle the distance to the horn and woofer constantly change. So how the drivers combine in the xover region changes. This is the crux of the matter because it changes the way the frequency response changes in the all important xover region. By moving that close it can give you peaks or holes anywhere from 500Hz to 2500Hz again depending on how the xover filters combine. If I get a chance I will send you a picture from my modeling software showing how things can change because of the listening distance. As you listen further away the difference from your ear to the woofer and compression driver gets closer and closer till these is no difference. At a longer distance is where you want to design to. If you make it measure and work correctly at 1 meter and on axis to the horn it will sound bad everywhere else. To properly measure a multi way speaker you should take the longest dimension of the baffle (Height?) and multiple times four. So a two feet height means the measurement mic should be at least eight feet from the baffle. They call this the distance the speaker system needs for the drivers to “integrate” correctly. If the UPA is designed for half way between the horn center and the woofer center your best result for listening at 1 meter is make sure that center spot is level with your ear. More than dispersion problems, which there may be, the timing for when the sound from the horn and woofer gets to your ear is correct for the xover design used. [/QUOTE]
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