i have modeled every speaker in my database and found that implementing a high pass filter before the amp (at 40, 60, 80 and 100hz.) causes a huge 6db hump at the crossover point. in fact, the resulting strain on the driver causes it to unload in the vast majority of cases at reference level.
This is one reason I use the symmetrical L/R -24dB slope for my low-pass and high-pass filters to the sub(s), it sums to zero dB gain and zero degree phase angle offset.
Most ported main speakers are probably in the -18dB to -36dB acoustic rolloff category all by themselves, unlike the well behaved 12dB rolloff of sealed acoustic suspension speakers.
Add this excessive rolloff of the ported speaker to the electical -12dB high-pass rolloff of the processor and you get crap for a smooth bass management xover. Who knows what kinhd of phase offsets in produces.
Just some of the reasons bass management is such a rats nest.
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