maxmercy said: Andy,



I use a Denon DN-AV500 (no individual analog channel input for center channel) as a pre/pro, with a minidsp on the back end managing two subwoofer clusters.



I am planning to use a Dirac Live enabled nanoAVR before it, so I won't have an EQ'ed LCR when I measure for MSO (in fact, I'll only be measuring with a loopback through the individual speaker amps most likely).



Can I use MSO for the sub out only for optimal delay/gains and maybe a few PEQ cuts without having to measure a sattelite/main (LCR) channel, so that I can measure/setup with Dirac afterward? Dirac will likely correct the center channel affecting the response, which MSO would not have been privy to before running DL. Click to expand...

maxmercy said: Thanks for such a great piece of software, is there a place we can donate to in order to further fund development? Click to expand...

MSO will give an error message if an optimization is attempted with no mains measurements defined. In optimizing the frequency response flatness, it first calculates the reference level by taking the average in dB over frequency of the combined mains/subs response at each listening position and for each (of potentially millions) of the EQ/gain/delay combinations attempted. This occurs in the frequency range defined as the "reference frequency range" in the optimization options dialog. The reference frequency range should be chosen where the response is nominally flat, starting somewhat above crossover and extending to, say, 200 Hz or so. Without mains measurements, this can't work properly.This gets to a broader issue of how to use MSO in conjunction with room correction systems. Unfortunately, these systems will tend to "fight" each other. On one hand, if one runs room correction before MSO, then suckouts might be present in the combined subwoofer output (because they haven't been optimized yet). These would be much better fixed by using MSO before room correction to adjust how the subs interact with each other to "fill in" the suckouts rather than boosting them with room correction. On the other hand, if you run room correction after MSO, it will apply filtering to both mains and subs, but without regard to how they interact with one another in the frequency domain in the crossover region. Unless you're very lucky, running the correction will degrade the integration.The simplest way to fix this up after running room correction might be to just apply pink periodic noise in REW and tweak the sub distance in the AVR to get the best integration using the RTA. I should mention that I am not at all familiar with Dirac. I'm a two-channel guy in the "dont EQ above Schroeder" camp. If Dirac changes the crossover frequency to something different from what was used when running MSO (as Audyssey might do), then all bets are off as far as MSO optimization.I don't have anything like that set up, but thanks for the thought!