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I have read quite a bit about these networks and how they can smooth
response - especially to woofers by providing a steadier load (albeit
slightly lower) and in aiding the crossovers in keeping higher
frequencies away from the woofer. Thing is it looks like a lot of
speaker manufacturers don't use them. So I am left wondering why not?
Are they good with tube amps?

In my case I have Triangle Celius 202 speakers. The impedance curve for
the woofer has two bumps after the main rise and then no slow rise up to
the higher frequencies. The calculators on the web for the filters say
I should use the freq doubling point. Well. . .by a slight margin this
is the 4khz impedance point in my speaker. (When I try the second hump
which is almost the same size as the 4khz hump the filter seems to shut
down too much - it's centered at 300hz). Using the 4khz point doesn't
rob bass and does kill some higher freq energy from reaching my woofers.

I was wondering what everyone's thoughts were on the subject.