Use of the Auto-EQ function
In this example we are connecting the OUT L and OUT R outputs on the DEQ2496 to the inputs on a pair of powered monitors. The unit will be set in the DUAL MONO mode so that the Auto EQ process will run on one channel at a time.
1. Use an XLR mic cable to connect the ECM8000 reference mic into the RTA/MIC input on the back of the unit.
2. Press the UTIL key to reach page 1 (GENERAL SETUP), use the upper small jog wheel to select 'CHANNEL MODE', then use the large jog wheel to set the MODE to DUAL MONO. Press the B key to 'ACCEPT MODE'.
3. Press the I/O key to access page 1 of the I/O configuration.
4. Use the big jog wheel to highlight the 'MAIN IN' box and press the B key to accept the source.
5. Press the I/O or PAGE key to enter the I/O page 2 and highlight the 'WIDTH' box.
6. Press the I/O or PAGE key to enter the I/O page 3, use the large jog wheel to highlight 'RTA/MIC', and press the B key to highlight the +15v phantom power box (if it isn't already).
7. Press the RTA key to go to RTA page 1.
8. Press the B key (AUTO EQ), and you will enter AEQ page 1.
9. The DEQ2496 will now request that you edit the target curve. Use the A key to select the 'LEFT' channel. With the large and small jog wheels you can adjust the EQ bands to reflect the curve you want to end up with (it can be flat without any adjustment). Press and hold the B key to reset if you feel it's necessary at some point to restart the curve adjustment.
10. Press the PAGE key until page 2 (AEQ) is accessed. Highlight ROOM CORRECTION if desired.
11. Adjust NOISE GAIN with the large jog wheel as desired.
12. Adjust AUTO EQ to 'slow', 'mid', or 'fast' with the lower small jog wheel for the Auto EQ calculation speed.
13. Press the PAGE key until page 3 of the AEQ menu is displayed. The GEQ is shown with outlined virtual faders.
14. Adjust 'MAX' with the upper small jog wheel for the desired maximum difference (in gain) between adjacent frequency bands. A suggested starting point would be a value of '3'.
15. Press the A key to START AUTO EQ.
16. The DEQ2496 will measure the ambient (or room) noise for about 15 seconds.
17. The DEQ2496 will now produce pink noise at its outputs and will analyze system noise for about 15 seconds. If you get a message that the 'Pink noise level isn't high enough', turn up the pink noise level using the large jog wheel and restart the Auto EQ process or wait until a message appears that it is 'Starting Auto EQ Process'.
18. Once the Auto EQ process has begun you can view the 'progress' from page 2 (RTA response) or page 3 (Graphic EQ changes). If necessary, the 'MAX SPAN' and 'MAX' values mentioned above can be changed in real time, so that you can see the Graphic EQ changes.
19. Let this process run until it appears obvious that the adjustments begin to settle (or after about 90 seconds), then press the PAGE key until page 3 appears, and press the B key (DONE) to end the Auto EQ process. The unit will default to RTA pages 1-3.
20. The DEQ2496 will have created the corrective adjustments to achieve the target curve that you specified earlier in this process. To view the Auto EQ changes, press the GEQ key. The settings will be visible and available for further editing.
21. Repeat the process for the right channel on the unit.
Note: In the beginning of the Auto EQ process, the DEQ2496 can be set to 'STEREO LINK' mode (in the UTILITY menu) if you wish, so that the Auto EQ settings from one channel will be copied to the other channel.DEQ2496 Room Correction notes
The Room Correction on the unit is only active when the DEQ2496 is used for the AUTO-EQ procedure, after it is selected in the AEQ menu.
It will raise the lower frequency range of the noise signal slightly during the AUTO-EQ process, so that this frequency range isn't 'overridden' when used in a small room.
In answer to your question about getting an adequate signal level on the DEQ2496, the engineers suggest setting the MAX switch on the back of the unit to +12 dBu (this is the maximum input level) and also the settings in the GENERAL SETUP page in the UTLITY menu.
ECM8000 sensitivity rating
The sensitivity rating for the ECM8000 is 37dBv/Pa. This information can be loaded into the Mic Level parameter of the UTILITY menu in the DEQ2496.