Omnia Audio Omnia.9/XE - Manual (Page 92)

Once connected, plug your calibrated mic into the remote PC, install any necessary software or drivers,
and establish that it is working properly in Windows.
Set Up RTA and Oscilloscope Display Windows
After microphone installation and setup are complete, you will need to make sure you have the RTA and
the oscilloscope set up in a Display Window.
If an RTA is not already visible, select any of the current display windows to bring up a Display Settings
menu and set up one of the windows to monitor the Client Mic input (for example, Display 3, RTA, I/O,
Client Mic Input).
1/3 octave resolution will provide more of a “big picture” overview, while the 1/6 octave will identify more
specific peaks and valleys. We suggest an Average setting of 40 and a Target Range of 2.0dB. You will
need to adjust the Target and Range controls for your individual situation once you have pink noise
running through the speakers at a reasonable volume.
We also recommend setting up an Oscilloscope menu in the same manner so that you can watch for any
clipping that may occur should you need to make any significant boots to a particular part of the audio
spectrum during calibration. If you see (or hear) any clipping during the process, turn down the Master
Gain control in the Main 1 menu.
Feeding Pink Noise To the Speakers
From the Home menu, select Client Audio, Client Microphone Input, then Input Device from the Home
menu of the Omnia.9/XE client software on the remote PC. Your calibrated mic should be available in the
device menu. You may need to refresh the list to make it visible.
Return to the Home menu, select Monitor Outputs, then Speaker Output, then Main 1. Turn down the
Speaker Volume to a fairly low level, then enable Pink Noise for the left channel. Turn up the Speaker
Volume enough to bring the level of pink noise well above the noise floor of the room, and to a level that
approximates the volume at which you would normally listen to program material when adjusting your
processing. As you adjust the overall volume, you should see the RTA display respond.
Final Adjustments to the RTA
Once you have established an overall pink noise level, adjust the Range control so that you can see the
entire spectrum easily on the display, normally in the vicinity of 70 – 80dB.
Adjust the Target control so that the band with the lowest level (not counting very low or very high
frequencies that are clearly beyond the ability of the speaker to reproduce) is situated at the top of the
bright red target window. This will allow you to reduce, rather than boost, most of the frequencies with the
parametric EQ.
When reading the RTA, it is important to know what peaks and dips are actual representations of
“problem areas” with the speaker/room combination and which are microphone placement anomalies. If
you move the microphone just slightly and the problem area magically corrects itself, you’re seeing such
a placement-skewed reading. A little experimentation will quickly reveal this. Once you have finalized the
mic placement, it’s time to begin correcting things with the PEQ.
Using the Parametric EQ to Smooth Things Out
Methods of equalizing speakers in their rooms vary, but generally speaking, using the fewest number of
bands of EQ to achieve the desired result is preferred. Cutting (reducing) frequencies is usually preferred
to boosting (increasing) them, although sometimes boosting a certain range is not easily avoided.
Using the NfRemote Client Software
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