Advanced passive crossover design

the Gunnes paper is about systems with active filters. It says that:

"the measured response includes two kinds of anomalous behaviors. The first are linear, time invariant, and spatially consistent anomalies, meaning behaviors that don’t vary with the loudspeaker’s operating conditions or the ambient environment. These are correctable behaviors. The second are nonlinear, time variant, and spatially variant anomalies, meaning behaviors that vary with the loudspeaker’s operating conditions or the ambient environment. These are uncorrectable behaviors."

I'm not sure which category ringing in high-order passive filters falls into but I would guess it's the second 'uncorrectable' category. similarly I'm not sure DSP will solve lobing at crossover frequency of odd-order passive filters.

fudge22 wrote: transient response and lobing are important and can't be fixed with DSP   I’m guessing that you have not read the paper “Improving Loudspeaker Transient Response with Digital Signal Processing” by Dave Gunness.   I never took the FBT to bits to check the passive Xover, but I'd be willing to bet its a fairly fancy one.   You don’t need to take them apart. You can find pictures online. It is a fairly basic second order filter with what looks like PPTCs to pad the signal when the operator gets over enthusiastic with the volume control.   I wouldn't fancy my chances of matching the integration of those passives with DSP settings ! Well at least not without resort to fancy calibrated mics and software   I’ll take your word that you don’t have the skills to set up a DSP properly, but even cheap measurement mics will get you within one or two dB, and there are a number of free analysis software options available. It is a skill well worth aquiring.

the paper says that 
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