Technical Resources
The D2 and auto-eq programs

The D2 can act as a data acquisition front end for other analysis programs. There are two ways to do this, the External Analysis Interface, and by exporting the D2 microphone calibration files to load them into the external software.

When using EAI on the D2 Cinema version, the output from the Controller is fed into channel 2 on the USBPre2. Then the output from channel 2 is looped back into channel 1. The raw input from the Plexer, via the Controller, comes into line input 2, then the multiplexed, calibrated, gain leveled signal is present at the channel 2 output. By looping this output to line input 1, this calibrated stream can be selected by external programs. This process requires updated mic cal files with additional settings.

In the case of the Dolby Atmos Designer, the USBPre2 is selected at position 1 (only) in the DAD software. Using the pink noise option in DAD, and selecting PLEX and RUN on the D2 will give DAD a signal to perform its analysis on. To best correlate with Dolby levels, the microphones should be placed in a “Y” pattern with microphone 1 at the center of the Y. Also note that the ASIO USBPre2 drivers must be used because DAD looks for ASIO interfaces. After the process is completed, it is advised to check and fine tune the screen channels and LFE, using RTA mode as when manually tuning a room.

When used with the USL auto-eq, feed the channel 2 output to the microphone input on the USL processor. Then the processor can perform its analysis, and the screen channels and LFE can be verified and fine-tuned as necessary.

It should also be possible to export the microphone 1 calibration file and load this file into the external program. By pressing SHIFT, then clicking on the CLEAR (EXPORT) button in CONFIG->MIC, a mic cal file with a TXT extension will be placed in the program directory. If the raw frequency response characteristics of the microphones in the set are close enough (usually the case), the resulting equalization should be good. As mentioned above, the screen channels should always be verified.

When using winRTA Studio with Dolby Atmos, the best approach is probably to export the microphone 1 calibration file, and load it into DAD. Then the sine chirp test signal can be used. EAI can also be used, but it would require a second interface to feed the calibrated signal into.

All four microphone calibration files can be exported, if it is desired to perform some type of external analysis at each microphone position.

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