CHAPTER 5 |
20
NfREMOTE CLIENT SOFTWARE
Connect the Client PC and the Calibrated Mic
The first step to calibration is making sure you have a remote connection to your Omnia.7 per the instructions at
the beginning of this manual.
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 (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.7 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.
