The DE250 is a little more sensitive than the PSD2002, that's true. If you're using an Omega 15 (or JBL 2226), then use the values shown in the four π schematic for whichever compression driver you're using.I found the Paramours to be pretty insensitive to load impedance fluxuations. All models (amd options) of π speakers work very well with them, even those with a little higher Zmax.