Some time ago I took every thing Andy said about the MS-8 and pasted it into a Word doc.
I'm not cosigning below, I'm quoting Andy from that doc.
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I can do a better job than MS-8 but in order to do it I need lots of bands of parametric EQ (currently I have 176 biquads available for eq and crossover), time alignment, phase shifting parametric all pass filters...
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Let's make this easy and say a biquad is a filter that can be configured to be a high pass of just about any alignment; low pass of just about any alignment, parametric EQ of nearly any frequency, gain and Q; notch, high shelf; low shelf or phase shift. The MS-8 assigns the filter type and values (frequency, Q and gain) based on the measurements it makes and the algorithm (predefined process or set of instructions for making decisions written as code) that determines how the decision will be made. So, for the purposes of this discussion, MS-8 has 8 opportunities per channel to implement something that does part of the job of fixing the channel's response. The details of how it makes the decisions are proprietary, patented and too difficult for me to try to explain.
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With MS-8, there's little benefit in separate channels for tweeters. The ease of crossover adjustability in tuning is moot--since you're not tuning and time alignment is unnecessary up there.... Our ears aren't good at determining the location of sounds from 1k to 3k, and above 3k, level is the most important criterion. This arrangement provides accurate delay measurements and settings for the midbass and will fix the mids and tweeters using EQ.
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