Set Up Rta And Oscilloscope Display Windows; Feeding Pink Noise To The Speakers; Final Adjustments To The Rta; Using The Parametric Eq To Smooth Things Out - Omnia .9 Installation & User Manual

NFREMOTE CLIENT SOFTWARE CHAPTER 26 |
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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 (Processing Meters, Undo Meters, etc.) to bring up
a Display Settings menu. 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 boost 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
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.
Orange bars in the Speaker Volume control will indicate when the Speaker Output limiter is active and the Master Gain level
should be reduced accordingly.

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. Remember that there are a total of 12 available bands of EQ available
to you – 6 in the EQ1 menu and 6 more in the EQ2 menu.