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Author Topic: Speaker Distortion  (Read 2182 times)

Ghetto Defender

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Speaker Distortion
« on: May 03, 2004, 01:57:25 AM »

Speaker Distortion

I had the system at the church I’m working at sounding great! Then one day the system just took a shit on me, all over me. Here are the problems I’m currently facing. Input would be great.

The first problem I had was that the mix wasn’t set at unity gain. I mean, the guy that was working the system before me had the amps all the way up and the mixer level at its lowest possible point. What I did was lowered the amp level to about a little less than half. And I put everything at unity gain and  played a reference CD to try and get the right level in the cathedral. It was working just fine.

The mic placement on the choir was horrible; it was facing straight down, 10’ away from the choir. I moved it about 3’ from the first person and about 5’ above the tallest person in the back row. The mic is at a little more than 45
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Dietrich Sider

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Re: Speaker Distortion
« Reply #1 on: May 03, 2004, 10:25:50 AM »

I think a good place to start would be to do some reading about Gain Structure - there's a great article in the study hall you can use as a starting point.

http://www.prosoundweb.com/studyhall/studyjump.php?pdf=gain

Best Wishes
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Fred Garrett

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Re: Speaker Distortion
« Reply #2 on: May 03, 2004, 10:48:20 AM »

 
If all the speakers are breaking up at the same point in the music, then I would think that you are clipping the signal before the amplifier stage.  What do your channel inputs and board outputs look like during those peaks?  Do you use effects?  If so, how are they looking during the peaks?

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Michael Prasuhn

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Re: Speaker Distortion
« Reply #3 on: May 03, 2004, 12:30:18 PM »

Are you still using both lectern mics? No matter what you may have seen or heard, whenever you see dual lectern mics, 99.9% of the time you are listening to only one of them, with the second used for backup. Even with the capsules placed close together you are probably still experiencing phase problems, albeit at different frequencies.

-Mikey P
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Michael D. Prasuhn
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Tim Padrick

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Re: Speaker Distortion
« Reply #4 on: May 04, 2004, 03:00:33 PM »

The balanced input stage of the amplifier is ahead of the level control.  With the amp level attenuated that far, it could be that you are overdriving the amp input stage.

What mixer, amps, and ancillary gear are you using?

John Roberts {JR}

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Re: Speaker Distortion
« Reply #5 on: May 04, 2004, 03:38:14 PM »

TimmyP wrote on Tue, 04 May 2004 14:00

The balanced input stage of the amplifier is ahead of the level control.  With the amp level attenuated that far, it could be that you are overdriving the amp input stage.




While some amplifiers (like old CS series) run the input directly into an input attenuator before encountering any active circuitry, I agree with your general advice. While you may not be overloading the amplifier front end, by turning down power amp trims you are shifting the system's weakest link for headroom upstream to the mixer or processing.

There is good basic discussion on gain structure in the study hall, but the obvious experiment is to restore some of the gain that you removed from the power amps and see if the problem goes away.

JR
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Ghetto Defender

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Re: Speaker Distortion
« Reply #6 on: May 04, 2004, 09:20:33 PM »

Thanks for the input! I'm going to check out the gain structure artical and see if that can answer my questions.
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