Abstract: I have wondered WHY the DRC-measurement mics are supposed to point towards the roof??, rather than directly towards the speakers?
First lets differentiate between measuring for a 2.x setup and a multichannel setup.
I´ll use a 2.0 setup to explain.
The recommended mic for DRC-measurements is “omnidirectional”, but this is not really true. Over 12-14kHz it’s not.
So we see that, at 20kHz the amplitude is down 5db as compared to 10kHz. At 10Khz and below its omnipolar EXCEPT for behind the mic. That´s why, as an average the best place for multichannel measurements, is pointing up towards the roof (otherwise the back channels would be affected already from around 5kHz)
And why 2.x is better to measure with the mic pointed towards the two speakers in front. However…does the DRC-filtercalculations take that into account? Probably not, but I am surely going to put that question into the survey to the makers, that is planned. If NOT –
Conclusion: You should follow the recommendations of pointing the mic towards the roof and in positions where ALL the measured speakers kan see the mic on a direct path.
You can see that the measurement towards the roof rolls off the expected 5dB above 10kHz.
Never thought about the position of the mic like that? Seems important to me for the future.
When will You do a comparsion of different mic´s? Is an expensive mic really of any value in room correction?
Choice of mic? How important for making good DRC-filters is that?