Omni Sound Systems

Ballroom

Primary Sound System

More information on the ballroom page.

Training Guide

Critical Summary

• Incorrectly turning the sound system ON or OFF, may damage or destroy sensitive equipment. To safely use the sound system, you must use the correct order for turning all components ON and OFF.

Basic Procedure

• Turning the system ON
  • In the "Crow's Nest" above the stage, accessible from the ballroom mezzanine, there is a small platform accessible by a ladder built into the wall. Crawl up into this platform to approach the "rack", which consists of (from top to bottom):
    1. Power Conditioner
    2. Crossover
    3. Amplifier (amp) for tops (high-range speakers)
    4. Amplifier (amp) for bass (low-range speakers)
  • Ensure the volume nobs on both amplifiers in the rack are turned all the way down (counter-clockwise) before you do anything else.
    • There are four black nobs, two on each amplifier (the bottom two devices in the rack).
  • Ensure the rack is powered OFF, you can tell it's off if the fans are not spinning in the amplifiers.
  • Verify the rack is plugged in, on the opposite side of the wall, where there is an outlet on the right-hand-side of a ladder mounted on the wall, coming directly up from the stage below.
  • Find the "Mackey" audio mixer (mobile sound board / panel), and the "Guitar Center" bag that contains microphones, cables, and other accessories. They should be on the platform in the Crow's Nest, or securely locked in the room below the Crow's Nest, or in the locked in the "Safe Storage Room" between the Ballroom and La Commune.
  • Go down to the front of the stage, from the ballroom level.
  • There are two long XLR cables that run from the rack in the Crow's Nest down to stage-right, which should be coiled on top of the large stage-right speaker. These are the main output cables that connect to the XLR jacks on the back of the Mackey Mixer.
  • Set up the audio equipment throughout the ballroom to meet the needs of the event. Most importantly, ensure the main fader is all the way down. See more detailed instructions for this below.
  • Once the equipment is all set up, BEFORE YOU TURN ON THE RACK IN THE CROW'S NEST, plug in the mixer and turn it on.
    • If you turn the mixer on while the amps are on, you can severely damage the speakers.
  • See notes below about controlling the mixer
  • Turn the main fader up and ensure there is some sound (either from microphones or a source like a laptop), so that when the amplifiers are turned on, you can hear something.
  • Go up to the Crow's Nest again, approach the rack from the platform, and turn on the Power Conditioner (switch is labeled, it's on the front, which is the top left from your view of the rack).
  • Wait 10-30 seconds for the amplifiers to warm up.
  • Turn up both nobs on the bass amp (bottom in rack) first, all the way up.
  • Prepare to turn the tops amp up (second from bottom in rack), but do not turn the tops more than 120 degrees, meaning do not make them turn the nobs' arrows past horizontal.
    • Do not turn the tops amp all the way up, it is very powerful as-is.
  • Go back down into the ballroom, and check that sound is coming out of the speakers.
    • If you started with the tops amp fairly low, you can go back and increase it a bit to make sure they are just loud enough.
• Turning the system OFF
  • DO NOT TURN OFF THE MIXER FIRST, though you may turn down the main fader before proceeding.
    • If you turn off the mixer before the amplifiers, you risk severely damaging the speakers.
  • First, go up to the Crow's Nest and turn down the volume nobs (counter-clockwise) on both amplifiers (tops and bass), the bottom two devices of the rack.
  • Once these volume nobs are all the way down, turn off the power conditioner, the top device of the rack, which has a switch on the front site, accessible from the top-left of the rack.
  • Only once the rack is turned off can you turn off the Mixer
  • Once you have packed up the Mackey Mixer, and the Guitar Center bag full of microphones and cables, you can place them back in the Crow's Nest or other secure room, and be sure to lock the door
    • In the Crow's Nest, there is a door that needs to be latched shut that faces the stage.
    • The entrance door to the Crow's Nest should lock automatically after closing it. Check this before you leave.

Soundboard Operation

Secondary Sound System

Ideally, there should be a simplified, Do-It-Yourself (DIY) style sound system available to set up for lo-fi or low-key events.