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Calibration Setup – Home Acoustics Alliance Portal
Home / HAA Calibration Wizard / Calibration Setup

Calibration Setup

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Microphone Placement

  • Get your calibration kit and set up the mic stands.
  • If the seats are not at 1/2 or 1/4 length and width positions, set them up in random positions within the seating area.
  • Place one mic at the MLP (main listening position)
  • Avoid placing any mic in a null which are located at 1/2 or 1/4 length and width positions.
  • Mix up the height of each mic; avoid placing any two mics at the same height.
  • Try to keep all mics away from speakers.
  • If the seats are in nulls, focus mic placement on the head locations.
  • Try to place the mics to avoid blocking the seat from being sat in.

AudioTools Calibration

  • Place your microphone calibrator on the MLP microphone.
  • Switch it on to the 94 dB setting.
  • By selecting this checklist item, the mic calibrator should already be shown.
  • Make sure the 48V phantom setting is turned on.
  • Adjust the Pre-amp Hardware Gain setting to show a 95 to 98 dB dBA Slow reading.
  • Tap the dBA slow indicator, this will show a keyboard.
  • AudioTools should have already set the level to 94 dB. Click to finish.
  • This should calculate and set the required trim to show a 94 dB reading.

HAA Kit Calibration

  • Power up the digital interface (Audio4C).
  • Make sure all microphones are connected.
  • Press the 48V button turning it green.
  • Select each active microphone button (top row of buttons) to make them Green.
  • This ensures each microphone is receiving the 48V Phantom voltage.
  • This procedure needs to be repeated each time you power up the interface.
  • Select the In button on the Audio4C, make sure it is Red.
  • This places the Audio4C in level calibration mode.
  • Select the microphone 1 button on the top row making it Green.
  • Turn off all the other microphones by selecting each other top row button.
  • Turn on the microphone calibrator using the 94 dB option.
  • Place it on the microphone, and make sure the room is quiet.
  • Connect the Audio4C to the iPad or computer using the USB cable provided.
  • Open the HAA Calibration App and create a project.
  • In the Evaluation Phase select Microphone Calibration.
  • You will know the Audio4C is connected by observing that Audio4C is listed as the connected device.
  • Select the Audio4C L Mic and making sure it is set to Low Range.
  • Selection is accomplished by clicking the "circle i" on the right.
  • Now you are ready to calibrate the other microphones.
  • Click Done on the previous Microphone Calibration screen.
  • Once your back to the input selection screen, select the Mux control above it.
  • The Mux screen allows you to select other microphones.
  • Turn on microphone 2 and turn off the other microphones using the Include controls.
  • Go back to the Audio4C and turn off microphone 1 and turn on microphone 2.
  • Make sure the In control is still Red.
  • Switch the microphone calibrator to microphone 2.
  • Returning to the Mux screen in the app, you should see the microphone level on the bottom of the screen.
  • Use the knob on the Audio4C to adjust the level to 94 dB.
  • Repeat this for all the microphones.
  • When complete, press the knob on the Audio4C to save the settings.
  • Select the In button on the Audio4C switching it to Green.
  • All microphones are now calibrated.
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