Video was interesting - thanks for that.
So - what I'm hoping to fix is some bass boom. Listening room is small - about 9ft by 11ft. I've tamed it (but not cured it) up to now with partial port bungs - but that obviously is not ideal.
I would expect that FR correction would be sufficient for this - particularly as levimax suggested for learning the tools. One immediate question coming from the video - they set up the filters for minidsp. If I want FIR wav files for a convolution AU, what would be the settings for that? I guess generic - would that be correct? And then export filter response as WAV?
I use REW together with Rephase to create FIR filters (WAV files). There is information online on this. Rephase has a learning curve but I think it is well worth learning how to use as it add a lot of functionality and flexibility when creating the FIR WAV corrections. It also has a lot of phase correction functionality and it is free.
RE: Phase controversy. While the graphs look "nice" for a impulse response if the phase is correct it is believed by most objectivists that phase (within reason) is not audible. Others claim they can hear all sorts of "better" things when the phase is aligned.
RE: Phase practical matters: It is a big PITA to try to use REW to accurately measure phase in a room. There are so many reflections and other issues. You need to take multiple measurements in multiple locations along with "gating" for HF measurements and LF is nearly impossible because you can't use gating. Then trying to measure if you "succeeded" with your phase correction is another huge issue. All in all a difficult process that is hard to verify if it is working correctly with a real chance of making things worse.
RE: Possible phase solution. Since I have DIY speakers I know what type of crossovers I have. One really nice feature of Rephase is that is has "crossover presets" for phase adjustments. You specify your crossover type and frequency and rephase adds a phase correction to the FIR filter "automatically"... it is probably not 100% perfect but to me it seems to work about 90% which since it probably doesn't matter is good enough for me.