So, apparently, different types and qualities of speaker cable will have different attenuation to different frequencies. Why not boost the signal at those frequencies being attenuated?
Imagine a receiver that you connect to a "stub" speaker for calibration. The receiver could pass a signal through the stub, measure the relative power loss at different frequencies and different drive levels, and build a model for a dynamic power-switched equalizer. (As a stage between the primary equalizer and the amp)
This would let you (mostly; Your frequency bucket size will still have an impact) eliminate your wiring as a source of frequency variation, though you'd still have to deal with general attenuation. Your initial eq is still in place, so you can still choose between your "jazz", "rock", and "movies" modes.
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