I’ve got Dirac Live Stereo 3.x (Win 10), when setting up prior measurements I can balance speakers i.e increase/decrease gain on each speaker. Is this possible with the NAD Dirac Live implementation? If so that’l solve your problem I guess.
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This is one of those things that Dirac documentation makes a very poor job of explaining as to what these settings are for. As far as I understand it, they have nothing to do with actual channel balance but ensuring that the measurement can hear each of the speakers with sufficient volume level to measure and not clip while doing so (hence the instructions to get it approximately close not exact). When the filters are generated, it seems to take those settings into account to offset measured levels and level the balances (not use them as is).
In addition, the legacy experience of Dirac going from primarily stereo correction to multi-channel recently creates problems with the above model (a lot of their design - not the technology itself - didn't translate well into multi-channel from stereo). It is very likely that when you are doing a multi-position measurement around the MLP in a room, a surround side or rear speaker is much closer to one position of the mic than to another position of the mic for measuring the same speaker. It is easy to land up with a situation where it complains about clipping about the near position while not sufficient volume for the far position relative to the speaker. The slider for that speaker in the above UI may not have a position to accommodate both. If you touch the master or mic levels to fix it at that time, then it seems like you have to go back and redo every one of the earlier measurements for other channels already measured and they may start to clip or have problems with low volume! (Again, no documentation I have found to explain whether this remeasuring is necessary or not if those settings are altered in the middle of a measurement)
So much of the above could have been automated without requiring the user to jump through the hoops to get the levels right for measurement. I am not surprised a lot of the manufacturers have issues getting Dirac right on their hardware (where they are trying to minimize the effort on the user, they being much more consumer oriented than Dirac). It can't be easy working with Dirac.