My answers to those questions will differ a little depending on which setup I'm using.
When generating and adjusting PEQs, I don't focus on just the modes, but rather the overall measured response. I use the moving microphone method (MMM) -- using the default calibration file with the microphone oriented generally towards the front mains speaker being measured. Approximately 60x60x30cm (LxWxH) is the cubic area I use for my single-seat office desk setup. I also take a few regular log sweeps.
Separate PEQs are created for each channel, as well as shared filters for channel volume level adjustments and for the 'house curve' EQ.
Corrections are universal and do not change depending on the type of music. However, I use JRiver's automatic internal loudness DSP which is set to begin at my relative internal reference volume level 80% (0.0dB) i.e. -10dBFS in the DAC. When the internal volume setting is at or above that set relative internal volume reference level, loudness DSP correction is bypassed.
I also prefer to always have JRiver's Adaptive Volume correction enabled (some people don't like it).
Notably, all DSP corrections -- but not xo and channel routing 'room correction' -- will be manually bypassed during raw measurements as well as volume level calibration.
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Visualization purpose only! I don't have the PEQs entered in the miniDSP for this MCH setup.
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DSP is all done internally inside JRiver to take advantage of its 64bit processing.
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Filters and their Q listed (Right channel has same number of filters to Left)
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The Internal Reference Volume Level doesn't have to be set at 100% (it's relative after all)
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Just a rough visual preview of how loudness DSP compensation looks/works using pink noise. BTW, it's quite rare that I find myself disabling the loudness DSP as I've set it quite well enough that it just works almost perfectly with all media types.
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Volume Level Normalization
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Adaptive Volume Normalization
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Initial subwoofer volume level is set high to fill in huge null between 50 to 90Hz -- there's also a gigantic null below ~25Hz so a high pass is applied at 23Hz even though the sub is capable of going down much deeper.
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Sub's under the table (best compromise)! and can serve as a "leg shaker"
BTW, I'm under no illusion that those foam acoustic wedges do anything to mitigate room modes & nodes.