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Junior Varsity
JBL CBT-1000 Column Array Speakers
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<blockquote data-quote="John Renner" data-source="post: 212010" data-attributes="member: 12939"><p>Rob, I get the safety concern thank you for answering.</p><p></p><p> I have supported them with Kindorf/Unistrut from on top of the ceiling joists, screwed to the top of these joists. Then a double nutted 3/8" threaded rod comes down through the drop ceiling to another piece of Kindorf which in turn is screwed to the top of the speaker cabinet. From that top kindorf, there are two 3/8" threaded rods down each side of it to the bottom kindorf which is also screwed to the bottom, (to keep it angled and not sliding out) and double nutted again and the rods cut short. It's not the prettiest, but It has been there several years without loosening. </p><p>This speaker isn't that heavy, maybe 35lbs. When you consider that an 8/32 screw is rated at 40lbs, I trust this is safe enough. We are not in a normally earhquake area such as California. I am not a rigger, but I have worked in commercial construction and believe in overbuilding if I can.</p><p></p><p>But I know that could be construed as just being defensive, and I don't mean to be coming across that way. If I am wrong let me know - Please.</p><p></p><p>Decibels, No, we are not targeting 85 at the back, (especially for speech) we are using that as a MAX during worship, all instruments, all singing, and someone at the pulpit calling out words. for instance. The Speech range usually is from 65-75 Db </p><p></p><p>To mitigate stage volume, which was quite loud, and as you say, not under control, The guitar was mic'ed for overflow and recording, and had a marshall amp (2-12's), I have just changed the guitar amplifier to be a Mackie MK8 with a stomp box for some reverb, tonal control, and put it within 2' of the players head. Now he will play to his own volume, with a direct box instead, but now I have to put the guitar over the PA. Yesterday we tried that, and it seemed to work well. </p><p></p><p>We are going over the recordings now, to see if that changed the bleed-over into my other microphones and get some feedback from the musicians. The one of the guitarist says that in his opinion, the sound is better. Time will tell. </p><p></p><p></p><p>As far as how does the system sound with playback, what do you mean? with a commercial CD? or playing back what was recorded here?</p><p>Playing back what was recorded here, sounds pretty much like it was played to me. Younger ears are beginning to take over and I have to trust them to set what sounds proper. I cannot hear above 9khz, so I get some flack for that. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile :)" data-smilie="1"data-shortname=":)" /> Construction ears.<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f641.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":(" title="Frown :(" data-smilie="3"data-shortname=":(" /> </p><p></p><p>I just want to hand over the system with as few troubles as it is within my power to do.</p></blockquote><p></p>
[QUOTE="John Renner, post: 212010, member: 12939"] Rob, I get the safety concern thank you for answering. I have supported them with Kindorf/Unistrut from on top of the ceiling joists, screwed to the top of these joists. Then a double nutted 3/8" threaded rod comes down through the drop ceiling to another piece of Kindorf which in turn is screwed to the top of the speaker cabinet. From that top kindorf, there are two 3/8" threaded rods down each side of it to the bottom kindorf which is also screwed to the bottom, (to keep it angled and not sliding out) and double nutted again and the rods cut short. It's not the prettiest, but It has been there several years without loosening. This speaker isn't that heavy, maybe 35lbs. When you consider that an 8/32 screw is rated at 40lbs, I trust this is safe enough. We are not in a normally earhquake area such as California. I am not a rigger, but I have worked in commercial construction and believe in overbuilding if I can. But I know that could be construed as just being defensive, and I don't mean to be coming across that way. If I am wrong let me know - Please. Decibels, No, we are not targeting 85 at the back, (especially for speech) we are using that as a MAX during worship, all instruments, all singing, and someone at the pulpit calling out words. for instance. The Speech range usually is from 65-75 Db To mitigate stage volume, which was quite loud, and as you say, not under control, The guitar was mic'ed for overflow and recording, and had a marshall amp (2-12's), I have just changed the guitar amplifier to be a Mackie MK8 with a stomp box for some reverb, tonal control, and put it within 2' of the players head. Now he will play to his own volume, with a direct box instead, but now I have to put the guitar over the PA. Yesterday we tried that, and it seemed to work well. We are going over the recordings now, to see if that changed the bleed-over into my other microphones and get some feedback from the musicians. The one of the guitarist says that in his opinion, the sound is better. Time will tell. As far as how does the system sound with playback, what do you mean? with a commercial CD? or playing back what was recorded here? Playing back what was recorded here, sounds pretty much like it was played to me. Younger ears are beginning to take over and I have to trust them to set what sounds proper. I cannot hear above 9khz, so I get some flack for that. :) Construction ears.:( I just want to hand over the system with as few troubles as it is within my power to do. [/QUOTE]
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