"Peter Larsen" wrote in
message
BOB Urz wrote:

Strange, this seems to be a 3rd order filter rather than
what the tear sheets says.

Nothing strange here, a 24 dB L-R filter can only be
claimed implemented if the acoustic output from the units
actually have the proper acoustic slopes when combined
with the filter.

Agreed. Furthermore, the crossover drives a reactive load, not a resistive
one.

So, the crossover is unlikely to have an 18 dB/octave response that its
electrical configuration suggests. I suspect that it drives the tweeter just
above its resonance, where the tweeter is more like a capactive load. The
14 uF cap is then acting a bit like a member of a series capacitive voltage
divider.

This nets out to more like a 12 dB/octave high pass filter, which would
combine with the 12 dB/octave high pass acoustic characteristic of the
tweeter to provide a 24 dB/octave filter.