Questions & Answers

Monitors and Main output

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asked Aug 1, 2017 in Ai Mixers by venkatvenkataramanan (250 points)
edited Aug 1, 2017 by venkatvenkataramanan
Hi:

I ran into a situation last week in a live presentations that I seek guidance from expert sound technicians.

I was using StudioLive 16.4.2AI along with two Mackie Powerer Speackers as monitors and two Mackie Powerer Speackers for main output (I don't have an amplifier; one less item to lug along!).

I was dealing with a musical group (one percussion, two vocalists, one violin and on flute). I ad set up two monitors (on 1 and 2). One was positioned in front of the musicans just behind the microphones and one 25 feet awat facing them.

They complained that it was not loud enough (I can say they got to be deaf since it was pretty loud. In fact it was so loud that I did not have to turn on the house volume!). So, I had increased the monitor volumes as high as I could and the levels were also close to the maximum for most of the channels. I finally got their acceptance.

But the trouble started when I increased the house volume. I could barely reach 20 before there was a lot of boom and feedback. If I were sitting in the audience, it was barely audible.

Luckily for me, the school let me plug in my output into two of their channels. The school had its speakers and an amplifier. When I did that, I was able to increase the house volume considerably and the concert went off fine. I don't know what I would have/could have done if the school was kind enough to use their system to supplement mine.

Can one of you help me understand how the monitor level is related to the House level? What would you have done differently? Is it time for me to ditch using Powered Speakers and invest in a Amplifier and regular speakers?

venki

1 Answer

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answered Aug 2, 2017 by Michael Martin (89,010 points)
 
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This has more to do with the proximity of the microphones and the speaker's positions.

The feedback was cause because the FOH output was bleeding into the microphones, which then creates the loop in ALL of the speakers, amplifying the problem frequency throughout the system.

Proper gain-staging and EQ of the mics / system, good placement of the speakers, and knowing the limitations of the system are key. You may have simply had the FOH speakers too close to the players.

Learning to tune your system to get rid of bad frequencies in the particular venue's environment will help you in the long run.
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