Thanks for the content and plots you posted in this thread.
Regarding the pre-rise of the step response seen with FIR filters usage, what is your obsevation? Do you have some best practices tips for obtaining a small pre-rise? Number of taps maybe (more or less ?, if the hardware can take it), windowing?
I do my filters with rePhase and clearly hear that using FIR filters the sound is not so 'clean'/'crisp' than using simple IIR filters in EqualizerAPO engine. But then again, the phase is more liniar using liner-phase FIR filters.