They are all awesome have a great sound but they all tend to boost the cutoff fequency. I thought this would be impossible being passive units -
L & C can do that.
Regards,
Peter
To make this more clear (and please allow me to cut a few corners w.r.t. the textbook version):
passive means there can't pop up power out of nowhere (
no power-gain).
This doesn't mean that a signal
voltage at the filter-output can't be larger than at the input,
this because of resonance.
Just like a transformer: passive component, yet V_out can be larger than V_in. Voltage is just one of the contributors
to power.
Might look at filter-resonance as an impedance-transformation as well (at that freq).
Bye,
Peter