Impact of High/Low Shift on Cabinet Frequency Response

Ever wondered what the High and Low Shift parameters of the Profiler Cabinet implementation actually do to the cab frequency response? See attached plots.

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I made them myself using a method described here. It's the cab from the factory profile MB - /13 JRT915 84 3.

My personal two cents on the results: I was kind of surprised by the seemingly large impact on the mids, especially of the High Shift parameter. In addition, the pronounced early cut-off of the positive Low Shift was unexpected to me. I then did a coarse implementation of my own naive idea of such an algorithm. Plots attached.

Epilogue: IMHO ckemper is just a genius, and his DSP Team a rare collection of true wizards. They know the math but they trust their ears not their eyes. So I didn't even test my results -- presumably they're pure crap...